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1/30 www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. middle power class-d speaker amplifiers class-d speaker amplifier for digital input bd5446efv description bd5446efv is a class d speaker amplifier designed for fl at-panel tvs in particular for space-saving and low-power consumption, delivers an output powe r of 20w+20w. this ic employs state-of-the-art bipolar, cmos, and dmos (bcd) process technology that eliminates turn-on resistance in t he output power stage and internal loss due to line resistances up to an ultimate level. with this technology, the ic can achieve high efficiency of 87% (10w+10w output with 8 ? load). in addition, the ic is packaged in a compact reverse heat radi ation type power package to achieve low power consumption and low heat generation and eliminates nec essity of external heat-sink up to a total output power of 40w. this product satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system. features 1) bd5446efv has two system of digital audio interface . (i 2 s/lj format, sdata: 16 / 20 / 24bit, lrclk: 32khz / 44.1k hz / 48khz, bclk: 64fs (fixed), sys_clk: 256fs (fixed)) 2) within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10~26v) 3) it contributes to miniaturizing, making to the thin ty pe, and the power saving of the system by high efficiency and low hea t. 4) s/n of the system can be optimized by adjusti ng the gain setting among 8 steps. (20~34db / 2db step) 5) it has the output power limitation function th at can be adjusted to an arbitrary output power. 6) the decrease in sound quality bec ause of the change of the power supply voltage is prevented with the feedback circuitry of the output. in addition, a low noise and low distortion are achieved. 7) it provides with the best stereo dac output for the headpho ne usage. as a result, the out put of the selection of the digital input in two systems is possible. 8) eliminates pop noise generated when the power supply goe s on/off, or when the power supply is suddenly shut off. high quality muting performance is realized by using the soft-muting technology. 9) bd5446efv is a highly reliable design to which it has various protection functions. (high temperature protection, under voltage protection, output short prot ection, output dc voltage protection and clock stop protection) applications flat panel tvs (lcd, plasma), home audio, desktop pc, amusement equipments, electronic music equipments, etc., no.10075ebt14
technical note 2/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. absolute maximum ratings (ta=25 ) parameter symbol ratings unit conditions supply voltage v cc 30 v pin 25, 28, 29, 53, 54 *1 *2 power dissipation p d 2.0 w *3 4.5 w *4 6.2 w *5 input voltage v in -0.3 ~ 4.5 v pin 7 ~ 18, 21 *1 open-drain terminal voltage v err -0.3 ~ 30 v pin24 *1 operating temperature range t opr -25 ~ +85 storage temperature range t stg -55 ~ +150 maximum junction temperature t jmax +150 * 1 the voltage that can be applied reference to gnd (pin 6, 36, 37, 45, 46). * 2 do not, however exceed pd and tjmax=150 . * 3 70mm70mm1.6mm, fr4, 1-layer glass epoxy board (copper on bottom layer 0%) derating in done at 16mw/ for operating above ta 25. * 4 70mm70mm1.6mm, fr4, 2-layer glass epoxy board (copper on bottom layer 100%) derating in done at 36mw/ for operating above ta 25 . there are thermal via on the board. * 5 70mm70mm1.6mm, fr4, 4-layer glass epoxy board (copper on bottom layer 100%) derating in done at 49.6mw/ for operating above ta 25 . there are thermal via on the board. operating conditions (ta=25 ) parameter symbol ratings unit conditions supply voltage v cc 10 ~ 26 v pin 25, 28, 29, 53, 54 *1 *2 minimum load impedance (speaker output) r l_sp 5.4 ? *6 minimum load impedance (dac output) r l_da 20 k ? pin 22, 23 *6 do not, however exceed pd. * no radiation-proof design.
technical note 3/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. electrical characteristics (unless otherwise specified ta=25 ,vcc=13v,f=1khz,r l_sp =8 ? ,r l_da =20k ? ,resetx=3.3v,mutex=3.3v,pdx=3.3v, gain=20db,fs=48khz) item symbol limits unit conditions min typ max to ta l c i r c u i t circuit current i cc1 - 45 90 ma pin 25, 28, 29, 53, 54 no load circuit current (power down mode) i cc2 - 1.5 3 ma pin 25, 28, 29, 53, 54,no load resetx=0v,mutex=0v,pdx=0v open-drain terminal low level voltage v err - - 0.8 v pin 24,i o =0.5ma regulator output voltage 1 v reg_g 5.0 5.5 6.0 v pin 1, 27 regulator output voltage 2 v reg_3 3.0 3.3 3.6 v pin 5 high level input voltage v ih 2.5 - 3.3 v pin 7 ~ 18, 21 low level input voltage v il 0 - 0.8 v pin 7 ~ 18, 21 input current (input pull-down terminal) i ih 33 66 132 a pin 7 ~ 18, 21,vin = 3.3v speaker output maximum momentary output power 1 p o1 - 10 - w thd+n=10% gain=26db *7 maximum momentary output power 2 p o2 - 20 - w vcc=18v, thd+n=10% gain =26db *7 total harmonic distortion thd sp - 0.07 - % p o =1w, bw=20~20khz *7 crosstalk ct sp 65 80 - db p o =1w, bw=ihf-a *7 output noise voltage (sampling mode) v no_sp - 140 280 vrms - dbfs, bw=ihf-a *7 residual noise voltage (mute mode) v nor_sp - 5 10 vrms mutex=0v,- dbfs, bw=ihf-a *7 pwm sampling frequency f pwm1 - 512 - khz fs=32khz *7 f pwm2 - 705.6 - khz fs=44.1khz *7 f pwm3 - 768 - khz fs=48khz *7 dac output maximum output voltage v omax 0.85 1.0 - vrms 0dbfs,thd+n=1% channel balance cb -1 0 1 db 0dbfs total harmonic distortion thd da - 0.05 0.5 % -20dbfs,bw=20~20khz crosstalk ct da 65 80 - db 0dbfs,bw=ihf-a output noise voltage v no_da - 10 20 vrms - dbfs, bw=ihf-a residual noise voltage v nor_da - 3 10 vrms mutex=0v,pdx=0v, - dbfs, bw=ihf-a *7 these items show the typical per formance of device and depend on board layout, parts, and power supply. the standard value is in mounting device and parts on surface of rohm?s board directly.
technical note 4/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. electrical characteristic curves (v cc =13v,ta=25 ,r l_sp =8 ? ,r l_da =20k ? ,gain=20db,fin=1khz,fs=48khz) measured by rohm designed 4 layer board. 0 10 20 30 40 50 60 70 80 90 100 8 10 1214 161820 222426 28 vcc(v) icc(ma) 0 1 2 3 0 5 10 15 20 25 30 35 40 total output power(w) icc(a) 0 4 8 12 16 20 24 28 32 36 40 44 8 10 121416 18202224 2628 vcc(v) output power(w/ch) fig.1 fig.2 fig.3 fig.4 fig.5 fig.6 fig.7 fig.8 fig.9 fig.10 fig.11 fig.12 current consumption - power su pp l y volta g e output power - power supply voltage current consumption - out p ut p owe r efficiency - output power voltage gain - frequency fft of output noise voltage thd+n - output power thd+n - frequency crosstalk - output power crosstalk ?frequency wave form when releasing soft-mute wave form when activating soft-mute sampling mute 10 12 14 16 18 20 22 24 26 28 30 10 100 1k 10k 100k frequency(hz) voltage gain(db) po=1w l=22h c=0.47f c g =0.068 f -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency(hz) noise fft(dbv) without signal bw=20 20khz 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency(hz) thd+n(%) po=1w bw=20 20khz -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 0.001 0.01 0.1 1 10 output power(w) crosstalk(db) bw=20 20khz -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency(hz) crosstalk(db) po=1w bw=20 20khz fin=300hz p o = 3 . 3 w 5v/div 2v/div s p eaker out p u t 10ms/div mutex s p eaker out p u t mutex 10ms/div fin=300hz p o = 3 . 3 w 2v/div 5v/div 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 output power(w) thd+n(%) bw=20 20khz 100hz 1khz 6khz thd=10% thd=1% vcc=13v vcc=18v 0 10 20 30 40 50 60 70 80 90 100 024681012 output power(w/ch) efficiency(%)
technical note 5/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. electrical characteristic curves (v cc =18v,ta=25 ,r l_sp =8 ? ,r l_da =20k ? ,gain=20db,fin=1khz,fs=48khz) measured by rohm designed 4layer board. fig.13 fig.14 fig.15 fig.16 fig.17 fig.18 fig.19 efficiency ? output power voltage gain - frequency fft of output noise voltage thd+n - output power thd+n - frequency crosstalk - output power crosstalk - frequency 20 22 24 26 28 30 32 34 36 38 40 10 100 1k 10k 100k frequency(hz) v ol tag e g ai n(d b) po=1w l=22h c=0.47f cg=0.068f -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency(hz) noise fft(dbv) without signal bw=20 20khz 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency(hz) thd+n(%) po=1w bw=20 20khz -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 0.001 0.01 0.1 1 10 100 output power(w) crosstalk(db) bw=20 20khz -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency(hz) crosstalk(db) po=1w bw=20 20khz 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 output power(w) thd+n(%) bw=20 20khz 6khz 100hz 1khz 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 output power(w /ch) efficiency(%)
technical note 6/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. pin configuration and block diagram 40 39 38 37 36 35 34 33 32 31 30 29 48 47 46 45 44 43 42 41 28 3 4 5 6 7 8 9 14 15 16 17 18 19 20 21 10 11 12 13 22 23 24 51 50 49 54 53 52 27 26 25 i 2 s/lj interface gain selector pwm modulator 8 over sampling digital filter control interface test dac selector high temperature protection under voltage protection clock stop protection output short protection output dc voltage protection 1 2 vcca nc reg_g2 fila power limiter gnda dac reg_3 reg_g1 driver 1p driver 1n gndp1 reg_g1 reg_g1 vccp1 nc nc nc driver 2p driver 2n gndp2 reg_g2 reg_g2 vccp2 nc nc nc nc i 2 s/lj selector filp
technical note 7/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. pin function explanation (provided pin voltages are typ. values) no. pin name pin voltage pin explanation internal equivalence circuit 1 27 reg_g1 reg_g2 5.5v internal power supply pin for ch1 gate driver internal power supply pin for ch2 gate driver please connect the capacitor. 2 filp 1.75v~2.55v bias pin for pwm signal please connect the capacitor. 3 plmt 0v power limiter setting terminal 4 fila 2.5v bias pin for analog signal please connect the capacitor. 5 reg3 3.3v internal power supply pin for digital circuit please connect the capacitor. 6 gnda 0v gnd pin for analog signal 25 2 6 400k 25 3 6 27 4 6 50k 50k 25 5 6 500k 1 27 550k 53,54 28,29 45,46 36,37
technical note 8/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. no. pin name pin voltage pin explanation internal equivalence circuit 7 8 9 10 11 sys_clk bclk lrclk sdata1 sdata2 0v digital audio signal input pin 12 resetx 0v reset pin for digital circuit h: reset off l: reset on 13 mutex speaker output mute control pin h: mute off l: mute on 14 pdx power down control pin h: power down off l: power down on 15 iis_lj 0v digital audio signal data format setting terminal h: left justified format l: i 2 s format 16 17 18 gain1 gain2 gain3 0v gain setting terminal gain=20db~34db, 2db step 19 20 test1 test2 0v test pin please connect to gnd. 21 sel_dac 0v dac output selection terminal h: sdata2 is output from the dac l: sdata1 is output from the dac 5 7,8,9 10,11 6 50k 5 12,13,14 6 50k 5 6 15 50k 5 16,17,18 6 50k 5 19,20 6 50k 5 6 21 50k
technical note 9/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. no. pin name pin voltage pin explanation internal equivalence circuit 22 23 out_dac2 out_dac1 2.5v ch2 dac output pin ch1 dac output pin please connect it with the latter part circuit through the capacitor. 24 error 3.3v error flag pin please connect pull-up resistor. h: while normal l: while error 25 vcca vcc power supply pin for analog signal 26,30 34,35 41,47 48,52 n.c. non connection pin 500 25 24 6 25 6 22,23 50k
technical note 10/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. no. pin name pin voltage pin explanation internal equivalence circuit 28,29 vccp2 vcc power supply pin for ch2 pwm signal 31,32 out2p vcc~0v output pin of ch2 positive pwm please connect to output lpf. 33 bsp2p boot-strap pin of ch2 positive please connect the capacitor. 36,37 gndp2 0v gnd pin for ch2 pwm signal 38,39 out2n vcc~0v output pin of ch2 negative pwm please connect to output lpf. 40 bsp2n boot-strap pin of ch2 negative please connect the capacitor. 42 bsp1n boot-strap pin of ch1 negative please connect the capacitor. 43,44 out1n vcc~0v output pin of ch1 negative pwm please connect to output lpf. 45,46 gndp1 0v gnd pin for ch1 pwm signal 49 bsp1p boot-strap pin of ch1 positive please connect the capacitor. 50,51 out1p vcc~0v output pin of ch1 positive pwm please connect to output lpf. 53,54 vccp1 power supply pin for ch1 pwm signal 28,29 33 40 31,32 38,39 36,37 53,54 42 49 43,44 50,51 45,46
technical note 11/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. gain1 pin, gain2 pin, gain3 pin function gain3 (18pin) gain2 (17pin) gain1 (16pin) speaker output gain l l l 20db l l h 22db l h l 24db l h h 26db h l l 28db h l h 30db h h l 32db h h h 34db sel_dac pin function sel_dac (21pin) out_dac1 (23pin) out_dac2 (24pin) l the lch signal of sdata1 is output the rch signal of sdata1 is output h the lch signal of sdata2 is output the rch signal of sdata2 is output resetx pin function resetx (10pin) state of digital block l reset on h reset off resetx pin resetx (12pin) state of digital block l reset on h reset off pdx pin,mutex pin function pdx (12pin) mutex (11pin) power down dac output (24,25pin) pwm output (33,34,38,39, 43,44,48pin) l l or h on hiz_low hiz_low h l off normal operation h h normal operation iis_lj pin function iis_lj (15pin) digital data format l i2s h left justified
technical note 12/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. input digital audio signal sampling frequency (fs) explanation pwm sampling frequency, soft-start, soft-mute time, and the det ection time of the dc voltage protection in the speaker depends on sampling frequency (fs) of the digital audio input. sampling frequency of the digital audio input (fs) pwm sampling frequency (fpwm) soft-start / soft-mute time dc voltage protection in the speaker detection time 32khz 512khz 64msec. 64msec. 44.1khz 705.6khz 46msec. 46msec. 48khz 768khz 43msec. 43msec. for voltage gain (gain setting) bd5446efv prescribe voltage gain at speak er output (btl output) under the definition 0dbv (1vrms) as full scale input of the digital audio input signal. for example, digital audio input signal = full scale input, gain setting = 20db, load resistanc e r l_sp = 8 ? will give speaker output (btl output) am plitude as vo=10vrms. (output power po = vo 2 /r l_sp = 12.5w ) speaker output and dac output digital audio input signal sdata1 will be output to the speak er. (sdata2 will not be output to the speaker. dac output can be selected either from digital audio input signal sdata1 or sdata2.) format of digital audio input ? sys_clk: it is system clock input signal. it will input lrclk, bclk, sdata1 (sdata2) that synchronize s with this clock that are 256 times of sampling frequency (256fs). ? lrclk: it is l/r clock input signal. it corresponds to 32khz/44.1khz/48khz with those clock (fs) that are same to the sampling frequency (fs) . the data of a left channel and a right channel for one sample is input to this section. ? bclk: it is bit clock input signal. it is used for the latch of data in every one bit by sampling frequency?s 64 times sampling frequency (64fs). ? sdata1 & sdata2: it is data input signal. it is amplitude data. the data length is different accord ing to the resolution of the input digital audio data. it corresponds to 16/ 20/ 24 bit.
technical note 13/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. lrclk (sdata2) bclk sdata1 lch rch 32 clocks 32 clocks fig.20 i 2 s data format 64fs, 24 bit data msb 22 21 20 19 18 17 16 15 14 msb 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 13 12 11 10 9 8 7 6 76 3 54 1 2 lsb 3 54 12 lsb msb 18 17 9 8 7 6 5 msb 18 17 16 15 14 13 12 11 10 4321 lsb 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 lsb lrclk (sdata2) bclk sdata1 lch rch fig.21 i 2 s data format 64fs, 20 bit data msb msb lrclk (sdata2) bclk sdata1 lch rch 98765 14 13 12 11 10 4321 lsb 98765 14 13 12 11 10 4321 lsb fig.22 i 2 s data format 64fs, 16 bit data 1/64fs lrclk (sdata2) bclk sdata1 lch 1/64fs rch 32 clocks 32 clocks fig.23 left-justified data format 64fs, 24 bit data msb 22 21 20 19 18 17 16 15 14 msb 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 13 12 11 10 9 8 7 6 7 6 3 54 1 2 lsb 3 54 1 2 lsb msb 18 17 9 8 7 6 5 msb 18 17 16 15 14 13 12 11 10 4321 lsb 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 lsb lrclk (sdata2) bclk sdata1 lch rch fig.24 left-justified data format 64fs, 20 bit data msb msb lrclk (sdata2) bclk sdata1 lch rch 98765 14 13 12 11 10 4321 lsb 98765 14 13 12 11 10 4321 lsb fig.25 left-justified data format 64fs, 16 bit data i 2 s data format the low section of lrclk becomes lch, th e high section of lrclk becomes rch. after changing lrclk, second bit becomes msb. left-justified format the high section of lrclk becomes lch, the low section of lrclk becomes rch. after changing lrclk, first bit becomes msb.
technical note 14/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. power supply start-up sequence vccp1 (53, 54pin) vccp2 (28, 29pin) vcca (25pin) reg_g1 (1pin) reg_3 (5pin) pdx (14pin) bclk (8pin) lrclk (9pin) speaker output sdata1 (10pin) sdata2 (11pin) reg_g2 (27pin) power up vcca, vccp1, vccp2 simultaneously. reg_g1, reg_g2 reg_3 degital audio data communication. set pdx to high. set mutex to high. out_dac2 (22pin) out_dac1 (23pin) t t t t t t t mutex (13pin) resetx (12pin) set resetx to high after power up. t sys_clk (7pin) soft-start 43msec(fs=48khz)
technical note 15/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. power supply shut-down sequence vccp1 (53, 54pin) vccp2 (28, 29pin) vcca (25pin) reg_g1 (1pin) reg_3 (5pin) resetx (12pin) mutex (13pin) pdx (14pin) bclk (8pin) lrclk (9pin) sdata1 (10pin) sdata2 (11pin) reg_g2 (27pin) reg_g1, reg_g2 reg_3 set mutex to low. set pdx to low. stop digital audio date signal. set resetx to low power down vcca, vccp1, vccp2, simultaneously. out_dac2 (22pin) out_dac1 (23pin) t t t t t t t t sys_clk (7pin) soft-mute 43msec(fs=48khz)
technical note 16/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. about the protection function protection function detecting & releasing condition dac output pwm output error output output short protection detecting condition detecting current = 10a (typ.) normal operation hiz_low (latch) l (latch) dc voltage protection in the speaker detecting condition pwm output duty=0% or 100% 43msec(fs=48khz) above fixed hiz_low (latch) l (latch) high temperature protection detecting condition chip temperature to be above 150 (typ.) normal operation hiz_low h releasing condition chip temperature to be below 120 (typ.) normal operation under voltage protection detecting condition power supply voltage to be below 8v (typ.) normal operation hiz_low h releasing condition power supply voltage to be above 9v (typ.) normal operation clock stop protection detecting condition no change to sys_clk more than 1usec (typ.) irregular output hiz_low h releasing condition normal input to sys_clk normal operation normal operation * the error pin is nch open-drain output. * once an ic is latched, the circuit is not released automatically even after an abnormal status is removed. the following procedures or is available for recovery. after the mutex pin is made low once, the mutex pin is returned to high again. turning on the power supply again.
technical note 17/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. 1) high temperature protection this ic has the high temperature protec tion circuit that prevents thermal reckle ss driving under an abnormal state for the temperature of the chip to exceed tjmax=150 . detecting condition - it will detect when mute pin is set high and the temperature of the chip becomes 150 (typ.) or more. the speaker output is muted through a soft-mute when detected. releasing condition - it will release when mute pin is set high and the temperature of the chip becomes 120 (typ.) or less. the speaker output is outputted through a soft-start when released. out1p (50, 51pin) temperature of ic chip junction() speaker output out_dac2 (22pin) out_dac1 (23pin) 150 120 hiz-low soft-mute 43msec(fs=48khz) 3.3v error (24pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t t t soft-start 43msec(fs=48khz)
technical note 18/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. 2) under voltage protection this ic has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power supply voltage. detecting condition ? it will detect when mute pin is set high and the power supply voltage becomes lower than 8v. the speaker output is muted thr ough a soft-mute when detected. releasing condition ? it will release when mute pin is set high and the power supply voltage becomes more than 9v. the speaker output is outputted th rough a soft-start when released. out1p (50, 51pin) vcca (25pin) speaker output error (24pin) out_dac2 (22pin) out_dac1 (23pin) 9v 8v hiz-low soft-mute 43msec(fs=48khz) 3.3v vccp1 (53, 54pin) vccp2 (28, 29pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t t t soft-start 43msec(fs=48khz)
technical note 19/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. 3) clock stop protection this ic has the clock stop protection circuit that make t he speaker output mute when the sys_clk signal of the digital audio input stops. detecting condition - it will dete ct when mute pin is set high and the sys_clk signal stops for about 1usec or more. the speaker output is muted thr ough a soft-mute when detected. releasing condition - it will release when mute pin is set high and the sys_clk signal returns to the normal clock operation. the speaker output is outputt ed through a soft-start when released. out1p (50, 51pin) sys_clk (7pin) speaker output error (24pin) out_dac2 (22pin) out_dac1 (23pin) clock stop clock recover hiz-low protection start with about 1sec clock stop. 3.3v unstable out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t t t soft-start 43msec(fs=48khz)
technical note 20/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. 4)output short protection(s hort to the power supply) this ic has the pwm output short protecti on circuit that stops the pwm output when the pwm output is short-circuited to the power supply due to abnormality. detecting condition - it will detect when mute pin is set high and the current that fl ows in the pwm output pin becomes 10a(typ.) or more. the pwm output in stantaneously enters the state of hiz-low if detected, and ic does the latch. releasing method - after the mutex pin is set low once, the mutex pin is set high again. turning on the power supply again. 5) output short protection(short to gnd) this ic has the pwm output short protecti on circuit that stops the pwm output when the pwm output is short-circuited to gnd due to abnormality. detecting condition - it will detect when mute pin is set high and the current that flow s in the pwm output terminal becomes 10a(typ.) or more. the pwm output in stantaneously enters the state of hiz-low if detected, and ic does the latch. releasing method ? after the mutex pin is set low once, the mutex pin is set high again. turning on the power supply again. error (24pin) mutex(13pin) short to gnd release from short to gnd pwm out ic latches with hiz-low. released from latch state. sec(typ.) t t t out1p (50, 51pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) 10a(typ.) over current t latch release error (24pin) mutex13pin short to vcc release from short to vcc pwm out ic latches with hiz-low. released from latch state. sec(typ.) t t t out1p (50, 51pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) 10a(typ.) over current t latch release
technical note 21/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. 6) dc voltage protection in the speaker when the dc voltage in the speaker is impressed due to abnorma lity, this ic has the protection circuit where the speaker is defended from destruction. detecting condition - it will detect when mute pin is set high or low and pwm output duty=0% or 100% , 43msec(fs=48khz) or above. once detected, t he pwm output instantaneously enters the state of hiz-low, and ic does the latch. releasing method ? after the mutex pin is set low once, the mutex pin is set high again. turning on the power supply again out1p (50, 51pin) speaker output latch release state. error (24pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t soft-start t mutex(13pin) latch release pwm out locked duty=100% abnormal state. abnormal state release. pwm output ic latche with hiz-low. protection start surge current into speaker output for 43msec (fs=48khz) and over. 43msec(fs=48khz)
technical note 22/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. output power limiter function this ic is provided with an output power limiter function to protect speakers from destruction by an excessive output. limiter values are freely specified by changing external resistors r1/r2 as shown in fig-26. fig-27 shows a speaker output waveform that is generated with use of the output limiter function. be cause the waveform is soft-clipped, unusual noises on audible signals are significantly re duced under operation of limiter. use resistors with a high degree of accuracy for r1 and r2 ( 1% or higher accuracy is recommended). the capacitor c is for the noise removal of output power limitation terminal (3pin) . provide grounding with a 1f capacitor. specify a resistor of 10k ? or higher resistor r1 and r2. if the output power limiter f unction is not used, r1, r2 and c is unnecessary. however, connect 3pin with gnda. fig-26 fig-27 0 1 2 3 4 5 6 7 8 9 10 1 1.2 1.4 1.6 1.8 2 3pin t erminal voltage [v] output power(w/ch) . fig.28 output power ? 3 p in terminal volta g e 3 5 1f 1f r2 r1 reg_3 power limiter c gnda 5pin 3.3v speaker output soft clip vcc=13v, rl=8 , f=1khz gain=20db, 5pin=3.3v
technical note 23/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. application circuit example(r l_sp =8 ? ) 40 39 38 37 36 35 34 33 32 31 30 29 48 47 46 45 44 43 42 41 28 3 4 5 6 7 8 9 14 15 16 17 18 19 20 21 10 11 12 13 22 23 24 51 50 49 54 53 52 27 26 25 mute pdx 3.3v vss lrclk (fs=32khz48khz) bclk (64fs) sdata2 sdata1 i 2 s/lj interface gain selector pwm modulator 8 over sampling digital filter control interface test dac selector high temperature protection under voltage protection clock stop protection output short protection output dc voltage protection out_dac1 1f out_dac2 1f reset 1 2 sys_clk (256fs) 100k error gnda 3.3v vcca 10f vcca nc reg_g2 gnda 1f fila power limiter gnda digital audio source -con dac reg_3 1f reg_g1 driver 1p driver 1n gndp1 reg_g1 reg_g1 vccp1 nc vccp1 gndp1 1f 22h 22h 220f 0.068f 0.33f gndp1 0.068f 1f 8 nc nc driver 2p driver 2n gndp2 reg_g2 reg_g2 vccp2 nc nc nc vccp2 gndp2 1f 22h 22h 220f 0.068f 0.33f gndp2 0.068f 1f lch (sdata1) gndp2 3.3f gndp1 3.3f ( ) ( ) nc (rch) (lch) 8 rch (sdata1) i 2 s/lj selector 1f filp 5.6 470pf 5.6 470pf 5.6 470pf 5.6 470pf ( ) vss gnda 0.1f 1f 1f c1 c2 c4 c5 c22 c23 r24 c25 c25d c27 l31 c31a c31b r38b c28d c31 c28 c38b c38a l38 c38 c42 l43 c43a c43b r43b c53 c53d r50b c50b c50a c43c l50 c49 r31b c31c
technical note 24/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. bom list(r l_sp =8 ? ) parts parts no. value company product no. rated voltage tolerance size ic u1 rohm bd5446efv 18.5mm9.5mm inductor l31, l38, l43, l50 22 h toko 1168er-0001 - (20%) 10.3mm7.6mm sagami dbe7210h-220m - (20%) 10.5mm6.4mm resistor r31b, r38b r43b, r50b 5.6 rohm mcr18pzhzfl5r60 1/4w f(1%) 3.2mm1.6mm capacitor c31, c38, c42, c49 1 f murata grm185b31c105ke43 16v b(10% 1.6mm0.8mm c25, c28, c53 0.1 f grm188b31h104ka92 50v b(10% 1.6mm0.8mm c31a, c38a c43a, c50a 0.068 f grm21bb11h683ka01 50v b(10% 2.0mm1.25mm c31c, c43c 0.33 f grm219b31h334ka87 50v b(10% 2.0mm1.25mm c1, c27 3.3 f grm188b31a335ke15 10v b(10% 1.6mm0.8mm c2, c4, c5 c22, c23 1 f grm185b30j105ke25 6.3v b(10% 1.6mm0.8mm c31b, c38b c43b, c50b 470pf grm188b11h471ka 50v b(10% 2.0mm1.2mm electrolytic capacitor c28d, c53d 220 f panasonic eca1vmh221 35v 20% 3 8mm11.5mm c25d 10 f eeufc1h100l 50v 20% 3 5mm11mm
technical note 25/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. application circuit example(r l_sp =6 ? ) 40 39 38 37 36 35 34 33 32 31 30 29 48 47 46 45 44 43 42 41 28 3 4 5 6 7 8 9 14 15 16 17 18 19 20 21 10 11 12 13 22 23 24 51 50 49 54 53 52 27 26 25 mute pdx 3.3v vss lrclk (fs=32khz48khz) bclk (64fs) sdata2 sdata1 i 2 s/lj interface gain selector pwm modulator 8 over sampling digital filter control interface test dac selector high temperature protection under voltage protection clock stop protection output short protection output dc voltage protection out_dac1 1f out_dac2 1f reset 1 2 sys_clk (256fs) 100k error gnda 3.3v vcca 10f vcca nc reg_g2 gnda 1f fila power limiter gnda digital audio source -con dac reg_3 1f reg_g1 driver 1p driver 1n gndp1 reg_g1 reg_g1 vccp1 nc vccp1 gndp1 1f 15h 15h 220f 0.1f 0.47f gndp1 0.1f 1f 6 nc nc driver 2p driver 2n gndp2 reg_g2 reg_g2 vccp2 nc nc nc vccp2 gndp2 1f 15h 15h 220f 0.1f 0.47f gndp2 0.1f 1f lch (sdata1) gndp2 3.3f gndp1 3.3f ( ) ( ) nc (rch) (lch) 6 rch (sdata1) i 2 s/lj selector 1f filp 5.6 470pf 5.6 470pf 5.6 470pf 5.6 470pf ( ) vss gnda 0.1f 1f 1f c1 c2 c4 c5 c22 c23 r24 c25 c25d c27 l31 c31a c31b r38b c28d c31 c28 c38b c38a l38 c38 c42 l43 c43a c43b r43b c53 c53d r50b c50b c50a c43c l50 c49 r31b c31c
technical note 26/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. bom list(r l_sp =6 ? ) parts parts no. value company product no. rated voltage tolerance size ic u1 rohm bd5446efv 18.5mm9.5mm inductor l31, l38, l43, l50 15 h sagami dbe7210h-150m (20%) 10.5mm6.4mm resistor r31b, r38b r43b, r50b 5.6 rohm mcr18pzhzfl5r60 1/4w f(1%) 3.2mm1.6mm capacitor c31, c38, c42, c49 1f murata grm185b31c105ke43 16v b(10% 1.6mm0.8mm c25, c28, c53, c31a, c38a, c43a, c48a 0.1 f grm188b31h104ka92 50v b(10% 1.6mm0.8mm c31c, c43c 0.47 f grm21bb31h474ka87 50v b(10% 2.0mm1.2mm c1, c27 3.3 f grm188b31a335ke15 10v b(10% 1.6mm0.8mm c2, c4, c5 c22, c23 1 f grm185b30j105ke25 6.3v b(10% 1.6mm0.8mm c31b, c38b c43b, c50b 470pf grm188b11h471ka 50v b(10% 2.0mm1.2mm electrolytic capacitor c28d, c53d 220 f panasonic eca1vmh221 35v 20% 3 8mm11.5mm c25d 10 f eeufc1h100l 50v 20% 3 5mm11mm
technical note 27/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. output lc filter circuit an output filter is required to elimin ate radio-frequency components exceeding the audio-frequency region supplied to a load (speaker). because this ic uses sampling clock frequenc ies from 200khz to 400khz in the output pwm signals, the high-frequency components must be appropriately removed. this section takes an example of an lc type lpf shown in fi g.29, in which coil l and capac itor c compose a differential filter with an attenuation propert y of -12db/oct. a large part of switching current s flow to capacitor c, and only a small part of the currents flow to speaker r l . this filter reduces unwanted emission this way. in addition, coil l and capacitor cg compose a filter against in-phase compon ents, reducing unwanted emission further. filter constants depend on load impedances. the following are formulas to calculate values of l, c, and cg when q=0.707 is specified. fig. 29 r l : load impedance ( ? ) f c : lpf cut off frequency (hz) following presents output lc filter cons tants with typical load impedances. f c = 30khz f c = 40khz r l l c cg r l l c cg 6 ? 22h 0.68f 0.15f 6 ? 15h 0.47f 0.1f 8 ? 33h 0.47f 0.1f 8 ? 22h 0.33f 0.068f 16? 68h 0.22f 0.047f 16 ? 47h 0.15f 0.033f use coils with a low direct-current resistance and with a su fficient margin of allowable currents. a high direct-current resistance causes power losses. in addition, select a closed magnetic circuit type product in normal cases to prevent unwanted emission. use capacitors with a low equivalent series resistance, and good impedance characteristics at high frequency ranges (100khz or higher). also, select an item with suffici ent withstand voltage because flowing massive amount of high-frequency currents is expected. l l c c g c g r l 4 8 , 4 9 3 8 , 3 9 4 5 , 4 6 3 3 , 3 4 o r o r l r l 2 4 f c h c 2 f c r l 2 1 f cg 0 . 2 c f
technical note 28/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. notes for use 1 ) absolute maximum ratings use of the ic in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in ic damage. assumptions should not be made r egarding the state of the ic (short mode or open mode) when such damage is suffered. a physical safety measure such as a fuse should be implemented when use of the ic in a special mode where the absolute maximum ratings may be exceeded is anticipated. 2 ) power supply lines as return of current regenerated by bac k emf of output coil happens, take steps such as putting capacitor between power supply and gnd as a electric pathway for the regenerated current. be sure that there is no problem with each property such as emptied capacity at lo wer temperature regarding electrolytic capacitor to decide capacity value. if the connected power supply does not have suff icient current absorption capacity, rege nerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. it is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and gnd pins. 3 ) gnd potential(pin 6, 36, 37, 45, 46). any state must become the lowest voltage about gnd terminal and vss terminal. 4 ) input terminal the parasitic elements are formed in the ic because of the voltage relation. the parasitic element operating causes the wrong operation and destruction. t herefore, please be careful so as not to oper ate the parasitic elements by impressing to input terminals lower voltage than gnd and vss. please do not apply the voltage to the input terminal when the power-supply voltage is not impressed. 5 ) setting of heat use a thermal design that allows for a sufficient margin in light of the power dissipation (pd) in actual operating conditions. this ic exposes its frame of the backside of package. note that this part is assumed to use after providing heat dissipation treatment to improve heat dissipation efficiency. try to occupy as wide as possible with heat dissipation pattern not only on the board surface but also the backside. class d speaker amplifier is high efficiency and low heat generation by comparison with conventional analog power amplifier. however, in case it is oper ated continuously by maximum output power, power dissipation (pdiss) may exceed package dissipation. please consider about heat design t hat power dissipation (pdiss) does not exceed package dissipation (pd) in average power (poav). (tjmax : maximum junction temperature=150 , ta : peripheral temperature[ ], ja : thermal resistance of package[ /w], poav : average power[w], : efficiency) package dissipation : pd(w)=(tjmax - ta)/ ja power dissipation : pdiss(w)= poav (1/ - 1) 6 ) actions in strong magnetic field use caution when using the ic in the pres ence of a strong magnetic field as doi ng so may cause the ic to malfunction. 7 ) thermal shutdown circuit this product is provided with a built-in thermal shutdown circuit. when the the rmal shutdown circuit operates, the output transistors are placed under open status. the thermal shutdown circuit is primarily intended to shut down the ic avoiding thermal runaway under abnormal conditions with a chip temperature exceeding tjmax = 150 . 8 ) shorts between pins and misinstallation when mounting the ic on a board, pay adequ ate attention to orientation and placemen t discrepancies of the ic. if it is misinstalled and the power is turned on, the ic may be damage d. it also may be damaged if it is shorted by a foreign substance coming between pins of the ic or bet ween a pin and a power supply or a pin and a gnd. 9 ) power supply on/off (pin 25, 28, 29, 53, 54) in case power supply is started up, resetx(pin 12), mutex(pin 13) and pdx (pin 14) always should be set low. and in case power supply is shut down, it should be set low like wise. then it is possible to eliminate pop noise when power supply is turned on/off. and also, all power suppl y terminals should start up and shut down together. 10 ) error terminal(pin 24) a error flag is outputted when output s hort protection and dc voltage protection in the speaker are operated. these flags are the function which the condition of this product is shown in. 11 ) n.c. terminal(pin 26, 30, 34, 35, 41, 47, 48, 52) n.c. terminal (non connection pin) does not connect to the inside circuit. therefore, possible to use open. 12 ) test terminal(pin 19, 20) test terminal connects with ground to prevent the malfunction by external noise. 13 ) precautions for spealer-setting if the impedance characteristics of the speakers at high-fr equency range while increase rapidly, the ic might not have stable-operation in the resonance frequency range of the lc -filter. therefore, consider adding damping-circuit, etc., depending on the impedance of the speaker.
technical note 29/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. allowable power dissipation measuring instrument : th-156(shibukawa ku wano electrical instruments co., ltd.) measuring conditions : installation on rohm?s board board size : 70mm70mm1.6mm(with thermal via on board) material : fr4 ? the board on exposed heat sink on the back of package are connected by soldering. pcb : 1-layer board(back copper foil size: 0mm0mm), ja 62.5 /w pcb : 2-layer board(back copper foil size: 70mm70mm), ja 27.8 /w pcb : 4-layer board(back copper foil size: 70mm70mm), ja 20.2 /w 0 1 2 3 4 5 6 7 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 ambient temperature:ta( ) power dissipation pd w) pcb 6.2w pcb 4.5w pcb 2.0w
technical note 30/30 bd5446efv www.rohm.com 2010.05 - rev.b ? 2010 rohm co., ltd. all rights reserved. ordering part number b d 5 4 4 6 e f v - e 2 part no. part no. package efv : htssop-b54 packaging and forming specification e2: embossed tape and reel (unit : mm) htssop-b54 0.850.05 0.080.05 0.65 1.0max 0.22 +0.05 - 0.04 0.08 m s 0.08 54 28 27 1 18.50.1 (5.0) (6.0) 9.50.2 7.50.1 0.8 (max 18.85 include burr) 1pin mark 0.50.15 1.00.2 0.17 +0.05 - 0.03 s 4 + 6 ? 4 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 1500pcs e2 () direction of feed reel 1pin
r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospac e machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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