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M62295GP
LCD Back-light Control IC
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Description
M62295GP is a semiconductor integrated circuit designed for PC back-light control, which employs 2 output totempole output circuit specifically suitable for inverter drive with piezo device. Such necessary functions as light control, protection circuit are housed in 16-pin SSOP package. This allows for simplified peripheral circuit as well as compact and thin set design.
Features
Direct drive to n-ch/p-ch MOSFET Fixed output duty: 45% Output current (peak): 300 mA Light control Pulse synchronous control Output OFF period is adjusted synchronous with the OSC frequency. (1 kHz-200 kHz) Light control available from 10% (Min.) up to 100% by the voltage applied from outside. (Adj2 terminal) * Protection functions 2 kinds of timer-latch time setting available by 3 triggers (few seconds, several tens of seconds set by external capacitor) * * * *
Application
LCD Back-light control for Note P.C etc.
Block Diagram
VCC 15 5 Ref. volt + - + - 2.5 V - + 0.25 V Protection circuit (Timer latch) 6 7 8 Iscp 3 N.C 4 Adj2 + - - + UVLO P/C 14 ON/OFF RT 11 CT1 12 CT2 13 VCC Vref OSC. 1 G2
IN-
9
- + 1.25 V
Light control circuit
Latch
VCC
16 G1
2 GND
10 FB
Cscp1 Cscp2
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 1 of 10
M62295GP
Pin Arrangement
M62295GP G2 GND N.C Adj2 Vref Cscp1 Cscp2 Iscp 1 2 3 4 5 6 7 8 (Top view) 16 G1 15 VCC 14 P/C 13 CT2 12 CT1 11 RT 10 FB 9 IN-
N.C: No connection
Outline: PLSP0016JA-A (16P2E-A)
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 2 of 10
M62295GP
Absolute Maximum Ratings
(Ta = 25C, unless otherwise noted)
Item Supply voltage Output current Power dissipation Operating temperature Storage temperature Symbol VCC IOUT Pd Topr Tstg Ratings 28 50 300 400 -20 to +85 -40 to +125 Unit V mA mA mW C C Conditions Continuous Peak Ta = 25C
Electrical Characteristics
(Ta = 25C, VCC = 15 V, unless otherwise noted)
Limits Block All Item Operating supply voltage range Circuit current Circuit current in power control state UVLO ON threshold voltage OFF threshold voltage Hysteresis Input bias current Open loop gain Gain bandwidth product Max. output voltage Min. output voltage Max. sink current Max. source current Ref. voltage Reference voltage Line regulation Max. load current Oscillating frequency Max. oscillating frequency RT terminal voltage Light control Adj2 voltage at min. duty Min. duty for light control Adj2 voltage at 100% duty Adj2 terminal current Protection Light control frequency FB terminal H threshold volt. FB terminal L threshold volt. IscpL detection voltage. Cscp1 charge current Cscp2 charge current Cscp1 detection voltage Cscp2 detection voltage Circuit current at timer-latch P/C Output P/C terminal flow-in current P/C threshold voltage Output duty Output low voltage Output high voltage REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 3 of 10 Symbol VCC ICC ICC (PC) VTH ON VTH OFF Vhys IB AV GB VFB+ VFB- IFB+ IFB- Vref LINE Iref (Max) fOSC fOSC (Max) VRT VAdj2 (Min) Min Duty VAdj2 (Max) IAdj2 fOSC (CT2) FB VTH (H) FB VTH (L) Iscp VTH (L) ICSCP1 ICSCP2 CSCP1VTH CSCP2VTH Itimer-L IP/C VTH (ON) Duty VOL VOH Min. 3.6 4.5 15 3.27 35 -500 2.65 1 -50 2.40 1 1.1 2.3 5 0.1 -100 2.35 0.2 1.1 -0.8 -0.8 2.35 1.1 1.2 1 0.4 42 13.0 Typ. 6 30 3.43 3.36 70 -30 80 0.6 2.8 100 2 -80 2.50 5 5 100 1.25 2.4 10 0.2 -10 1 2.5 0.25 1.25 -1.3 -1.3 2.5 1.25 2.2 2 0.7 45 0.05 13.5 Max. 26 7.5 55 3.59 140 200 2.60 200 1.4 2.5 15 0.3 +100 2.65 0.3 1.4 -1.8 -1.8 2.65 1.4 3.2 4 1.0 48 0.4 Unit V mA A V V mV nA dB MHz V mV mA A V mV mA kHz kHz V V % V nA kHz V V V A A V V mA A V % V V RT = 12.4 k, CT1 = 470 pF fOSC = 100 kHz VAdj2 = Vref Test Conditions
OP. Amp.
OSC.
M62295GP
Function Description
* Output oscillation circuit and tooth-wave generating circuit for light control (RT, CT1, CT2)
RT (1.25 V) CT1 CT2
R1 FB R2 Ro CT1 CT2
Figure 1 Connections of RT, CT1, CT2 As shown in Figure 1, charge/discharge current for each oscillation circuit is set by connecting resistors to RT terminal. RT terminal is connected to FB terminal by resistor to control the frequency for light control. CT1 is the terminal for connecting capacitor for output oscillation circuit, generating triangular-wave oscillating between lower limit (approx. 0.25 V) and upper limit (approx. 1.25 V) by the charge current set at RT terminal. CT2 is the terminal for connecting capacitor for tooth-wave for light control, into which one twentieth of charge current of CT1 terminal flows generating tooth-wave oscillating between lower limit (approx. 0.25 V) and upper limit. (approx. 1.25 V) Each charge current and oscillation frequency is decided by the formula shown below.
CT1 charge / Discharge current (ICT1 charge) = 1.25 Ro 1.25 Ro * 1 20
CT2 charge / Discharge current (ICT2 charge) = 1 T 1 CT1 *
Output freq. (fOSC) =
=
2 ICT1 charge 1
Tooth-wave freq. (CT2OSC) = CT2 * Tooth-wave freq. (CT2OSC) Output freq. (fOSC)
1 ICT2 charge CT1 CT2 * 10
(divided ratio) =
CT1 T G1 (POUT) G2 (NOUT)
1.25 V 0.8 V 0.7 V 0.25 V
1.25 V CT2 0.25 V
Figure 2 Waveform for CT1, CT2, and G1, G2
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 4 of 10
M62295GP * ON/OFF control function (P/C)
VCC P/C
Figure 3 Connection Example for P/C ON/OFF control is available using P/C terminal. As shown in Figure 3, ON/OFF control is made by connecting P/C terminal to VCC or GND or by making P/C terminal open. P/C = VCC: IC in normal operation mode P/C = GND & OPEN: IC operation at halt * Light control function (Adj2) Figure 4 shows the connections of Adj2 terminal. When the light control voltage is 2.4 V or more, divided voltage by the resistors is applied. Light control is decided by the OSC. frequency of CT2 and the applied voltage to Adj2 terminal. Figure 5 shows how the applied voltage to Adj2 terminal relates itself to light control. The voltage range of Adj2 terminal available for light control is 0.1 V to 2.4 V. When the voltage is 2.4 V or more, light control duty becomes minimum (10%), and when it is 0.1 V or less, light control duty becomes 100%. Minimum duty is available by connecting Adj2 terminal to Vref terminal. Output waveform on above mentioned stage is shown in Figure 6 (a) to Figure 6 (c). Figure 6 (a) shows 100% light controlled state, Figure 6 (b) middle state (50% light controlled), Figure 6 (c) minimum duty state.
Light control voltage R1 Light control voltage Adj2 R2 Adj2
(a) In the case of direct applying to Adj2 terminal
(b) In the case of applying to Adj2 terminal by the division of resistors
Figure 4 Connections of Adj2 Terminal
Light Control Duty (%)
100 80 60 40 20 10 0.1 1.0 1.4 2.0 2.4
Adj2 Terminal Voltage (V)
Figure 5 Adj2 Terminal Voltage-light Control Duty Characteristics
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 5 of 10
M62295GP Formula for light control level by light control voltage
ON Duty = (100 - ON Duty Min) x VAdj2: Adj2 terminal voltage (V) ON Duty Min = 10 (%) 2.4 - VAdj2 + ON Duty Min (%) 2.4
G1 output G2 output CT2 waveform
Figure 6 (a) 100% Light Control
G1 output G2 output CT2 waveform
Figure 6 (b) 50% Light Control
G1 output G2 output CT2 waveform
Figure 6 (c) 10% Light Control
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 6 of 10
M62295GP * Protection function (timer-latch) (Cscp1, Cscp2, Iscp)
1.3A 1.3A
Cscp2 Cscp2
Cscp1 Cscp1
Figure 7 Connections of Cscp1, Cscp2 Application for timer-latch by detecting tube current and feedback voltage is available by using Iscp, Cscp1, Cscp2 terminal. Two kinds of setting for timer-latch time is available by the setting of Cscp1, Cscp2. Each timer-latch time is set by the formula below. Cscp1: Terminal for capacitance for timer-latch set (few second)
Timer-L (Cscp1) = Cscp1 x 2.5 1.3 x 10-6
Cscp2: Terminal for capacitance for timer-latch set (few millisecond)
Timer-L (Cscp2) = Cscp2 x 1.25 1.3 x 10-6
BL tube current detection Iscp
Figure 8 Connections of lscp Terminal
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 7 of 10
M62295GP Detection of tube current Detection of tube current is made by Iscp terminal. Detection voltage for Iscp terminal is set 1.25 V. After power is on, when Iscp voltage does not rise up to 1.25 V by timer-L (Cscp1) time, or when Iscp voltage becomes 1.25 V or less after start-up, abnormality is detected to move on to the protection operation mode in Figure 1. If Iscp voltage is less than 1.25 V, light control is not made. (100%) Detection of feedback voltage Detection of feedback voltage is made by FB terminal. When FB terminal voltage goes down to FB low detection voltage (0.25 V) or less, or when it rise up to FB terminal high detection voltage or more, abnormality is detected to move on to the protection operation mode in Figure 1. Table 1 Protection Operation Mode at a Glance
Protection Operation Mode IO = Max IO = 0 Start-up in open state Start-up in black mode OFF ON Operation stop after 10 ms Operation stop instantaneously Operation stop after 2 s. Operation stop after 2 s. Normal start-up if turn-on is made within 2 s. Operation stop instantaneously Operation stop instantaneously Operation stop instantaneously O Triggers for Protection Operation Ampout = "H" Ampout = "L" O O O O O O O O IO = 0 Timer-latch Time 2s 10 ms O O
Operation State Normal start-up Start-up in shortcircuited state
Shortcircuit while in operation
IO = Max IO = 0
O O O
O O O
Open while in operation
Notes: 1. Timer-latch time refers to the time under Cscp = 1 F, Cscp2 = 0.1 F. 2. Amp. output is "H" when tube current Io equals to 0, "L" when it is at its minimum. Detection voltage is 2.5 V ("H" side), 0.25 V ("L" side).
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 8 of 10
M62295GP
47 k Piezo transformer 2.2 M
4.7 k
BL tube
VIN
47 k
47 F
4700 pF 0.1 F 120 k 2.2 k FB IN- G1
2.2 k
470 pF
9.1 k
3.3 k
10 k
10 k
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 9 of 10
220 0.022 F 120 k 0.022 F 33 k CT2 VCC CT1 RT
BL Back-light Control Application Example
M62295GP
G2 Iscp Adj2 Vref Cscp2 Cscp1 P/C GND
0.022 F 470 k 0.1 F 1.5 F 0.1 F
0.1 F
M62295GP
Package Dimensions
JEITA Package Code P-LSSOP16-4.4x5-0.65 RENESAS Code PLSP0016JA-A Previous Code 16P2E-A MASS[Typ.] 0.06g
16
9
HE
E
F
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
*1
1 Index mark
8
c
A2
A1
Reference Symbol
Dimension in Millimeters
*2 D
*3 e y
bp Detail F
D E A2 A A1 bp c HE e y L
Nom Max 5.0 5.1 4.4 4.5 1.15 1.45 0 0.1 0.2 0.17 0.22 0.32 0.13 0.15 0.2 0 10 6.2 6.4 6.6 0.53 0.65 0.77 0.10 0.3 0.5 0.7
Min 4.9 4.3
REJ03D0856-0201 Rev.2.01 Nov 14, 2007 Page 10 of 10
A
L
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