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82008 ms pc/41503rm (ot) no.7497-1/15 specifications of any and all sanyo semiconductor co.,l td. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' sproductsor equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general el ectronics equipment (home appliances, av equipment, communication device, office equipment, industrial equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. if there is n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. LB11922 overview the LB11922 is a pre-driver ic designed for constantspeed control of 3-phase brushless motors. it can be used to implement a motor drive circuit with the desired output capacity (voltage, current) by using discrete transistors for the output stage. it implements direct pwm drive for minimal power loss. features ? direct pwm drive output ? speed discriminator + pll speed control circuit ? speed lock detection output ? built-in crystal oscillator circuit ? forward/reverse switching circuit ? braking circuit (short braking) ? full complement of on-chip protection circuits, including lock protection, current lim iter, and thermal shutdown protection circuits. specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max 8v maximum input current ireg max vreg pin 2 ma output current i o max uh, vh, wh, ul, vl, and wl outputs 30 ma pd max1 independent ic 0.62 w allowable power dissipation pd max2 when mounted on the specified pcb 1.36 w operating temperature topr -20 to +80 c storage temperature tstg -55 to +150 c * specified circuit board : 114.3 76.1 1.6mm 3 : glass epoxy board monolithic digital ic for oa products three-phase brushless motor driver orderin g numbe r : en7497a
LB11922 no.7497-2/15 allowable operating conditions at ta = 25 c parameter symbol conditions ratings unit supply voltage v cc 4.4 to 7.0 v input current range ireg vr eg pin (7v) 0.2 to 1.5 ma fg schmitt output applied voltage vfgs 0 to 7 v fg schmitt output current ifgs 0 to 5 ma lock detection applied voltage vld 0 to 7 v lock detection output current ild 0 to 20 ma electrical characteristics at ta = 25 c, v cc = 6.3v ratings parameter symbol conditions min typ max unit i cc 1 22 30.5 ma i cc 2 in stop mode 2.4 3.4 ma i cc 3 v cc = 5v 21 28 ma supply current i cc 4 v cc = 5v, in stop mode 2.1 2.9 ma output saturation voltage 1-1 v o sat1-1 at low level : i o = 400 a 0.1 0.3 v output saturation voltage 1-2 v o sat1-2 at low level : i o = 10ma 0.8 1.2 v output saturation voltage 2 v o sat2 at high level : i o = -20ma v cc -1.2 v cc -0.9 v hall amplifier input bias current ihb (ha) -2 -0.1 a common-mode input voltage range 1 vicm1 when hall-effect sensors are used 0.5 v cc -2.0 v common-mode input voltage range 2 vicm2 when one-side biased inputs are used (hall-effect ic applications) 0 v cc v hall input sensitivity sine wave 100 mvp-p hysteresis width vin (ha) 20 30 50 mv input voltage low high vslh 9 17 29 mv input voltage high low vshl -25 -13 -5 mv pwm oscillator output high-level voltage 1 v oh (pwm)1 3.5 3.8 4.1 v output high-level voltage 2 v oh (pwm)2 v cc = 5v 2.75 3.0 3.25 v output low-level voltage 1 v ol (pwm)1 1.8 2.1 2.4 v output low-level voltage 2 v ol (pwm)2 v cc = 5v 1.45 1.65 1.9 v oscillator frequency f (pwm) c = 560pf 22 khz amplitude 1 v (pwm)1 1.4 1.7 2.0 vp-p amplitude 2 v (pwm)2 v cc = 5v 1.1 1.35 1.6 vp-p csd circuit output high-level voltage 1 v oh (csd)1 3.95 4.4 4.85 v output high-level voltage 2 v oh (csd)2 v cc = 5v 3.15 3.5 3.85 v output low-level voltage 1 v ol (csd)1 1.1 1.4 1.7 v output low-level voltage 2 v ol (csd)2 v cc = 5v 0.9 1.1 1.3 v external capacitor charge current ichg1 -13 -9 -6 a external capacitor discharge current ichg2 8 12 16 a oscillator frequency f (rk) c = 0.068 f 22 khz amplitude 1 v (rk)1 2.65 3.0 3.35 vp-p amplitude 2 v (rk)2 v cc = 5v 2.1 2.4 2.65 vp-p crystal oscillator operating frequency range f osc 3 10mhz low-level pin voltage v osc l i osc = -0.3ma 1.65 v high-level pin current i osc h v osc = v osc l + 0.3v 0.35 ma current limiter operation limiter vrf 0.235 0.260 0.285 v continued on next page.
LB11922 no.7497-3/15 continued from preceding page. ratings parameter symbol conditions min typ max unit thermal shutdown operation thermal shutdown operating temperature tsd design target value * 150 180 c hysteresis width tsd design target value * 30 c vreg pin vreg pin voltage vreg i = 500 a 6.6 7.0 7.4 v low-voltage protection circuit operating voltage vsd l 3.55 3.75 4.00 v release voltage vsdh 3.85 4.03 4.25 v hysteresis width vsd 0.18 0.28 0.38 v fg amplifier input offset voltage v io (fg) -10 +10 mv input bias current ib (fg) -1 +1 a output high-level voltage 1 v oh (fg)1 ifgi = -0.1ma, no load 4.2 4.6 5.0 v output high-level voltage 2 v oh (fg)2 ifgi = -0.1ma, no load, v cc = 5v 3.6 3.95 4.3 v output low-level voltage 1 v ol (fg)1 ifgi = 0.1ma, no load 1.3 1.7 2.1 v output low-level voltage 2 v ol (fg)2 ifgi = 0.1ma, no load, v cc = 5v 0.7 1.05 1.4 v fg input sensitivity gain : 100 3 mv schmitt amplitude for the next stage 100 180 250 mv operating frequency range 2 khz open-loop gain f (fg) = 2khz 45 51 db reference voltage vb (fg) -5% v cc /2 5% v fgs output output saturation voltage v o (fgs) i o (fgs) = 2ma 0.2 0.4 v output low-level voltage i l (fgs) v o = v cc 10 a speed discriminator output output high-level voltage v oh (d) v cc -1.0 v cc -0.7 v output low-level voltage v ol (d) 0.8 1.1 v speed control pll output v oh (p)1 4.05 4.30 4.65 v output high-level voltage v oh (p)2 v cc = 5v 3.25 3.50 3.85 v v ol (p)1 1.85 2.15 2.45 v output low-level voltage v ol (p)2 v cc = 5v 1.25 1.60 1.85 v lock detection output saturation voltage v ol (ld) ild = 10ma 0.25 0.4 v output leakage current i l (ld) v o = v cc 10 a lock range -6.25 +6.25 % integrator input offset voltage v io (int) design target value * -10 +10 mv input bias current ib (int) -0.4 +0.4 a output high-level voltage 1 v oh (int)1 iinti = -0.1ma, no load 4.1 4.4 4.7 v output high-level voltage 2 v oh (int)2 iinti = -0.1ma, no load, v cc = 5v 3.45 3.7 3.95 v output low-level voltage 1 v ol (int)1 iinti = 0.1ma, no load 1.2 1.4 1.65 v output low-level voltage 2 v ol (int)2 iinti = 0.1ma, no load, v cc = 5v 1.1 1.3 1.5 v open-loop gain 45 51 db gain-bandwidth product desi gn target value * 1.0 mhz reference voltage vb (int) design target value * -5% v cc /2 5% v note : * these items are design target values and are not tested. continued on next page.
LB11922 no.7497-4/15 continued from preceding page. ratings parameter symbol conditions min typ max unit s/s pin input high-level voltage v ih (s/s) v cc = 6.3v, 5v 2.0 v cc v input low-level voltage v il (s/s) v cc = 6.3v, 5v 0 1.0 v input open voltage v io (s/s) v cc -0.5 v cc v hysteresis width v in (s/s) v cc = 6.3v, 5v 0.13 0.22 0.31 v input high-level current i ih (s/s) vs/s = v cc -10 0 +10 a input low-level current i il (s/s) vs/s = 0v -170 -118 a pull-up resistance ru (s/s) 37 53.5 70 k f/r pin input high-level voltage v ih (f/r) v cc = 6.3v, 5v 2.0 v cc v input low-level voltage v il (f/r) v cc = 6.3v, 5v 0 1.0 v input open voltage v io (f/r) v cc -0.5 v cc v hysteresis width v in (f/r) v cc = 6.3v, 5v 0.13 0.22 0.31 v input high-level current i ih (f/r) vf/r = v cc -10 0 +10 a input low-level current i il (f/r) vf/r = 0v -170 -118 a pull-up resistance ru (f/r) 37 53.5 70 k br pin input high-level voltage v ih (br) v cc = 6.3v, 5v 2.0 v cc v input low-level voltage v il (br) v cc = 6.3v, 5v 0 1.0 v input open voltage v io (br) v cc -0.5 v cc v hysteresis width v in (br) v cc = 6.3v, 5v 0.13 0.22 0.31 v input high-level current i ih (br) vbr = v cc -10 0 +10 a input low-level current i il (br) vbr = 0v -170 -118 a pull-up resistance ru (br) 37 53.5 70 k n pin input high-level voltage v ih (n) v cc = 6.3v, 5v 2.0 v cc v input low-level voltage v il (n) v cc = 6.3v, 5v 0 1.0 v input open voltage v io (n) v cc -0.5 v cc v hysteresis width v in (n) v cc = 6.3v, 5v, design target value * 0.13 0.22 0.31 v input high-level current i ih (n) v n = v cc -10 0 +10 a input low-level current i il (n) v n = 0v -170 -118 a pull-up resistance ru (n) 37 53.5 70 k note : * these items are design target values and are not tested. package dimensions unit : mm (typ) 3247a sanyo : ssop36(275mil) 1 36 18 19 0.8 15.0 0.5 7.6 0.2 0.3 (0.7) 5.6 (1.5) 1.7max 0.1 pd max -- ta ambient temperature, ta ? c allowable power dissipation, pd max ? w 0 1.36 0.76 0.35 1.2 0.8 0.4 0.62 1.6 ? 20 80 60 20 40 0 100 specified board : 114.3 76.1 1.6mm 3 glass epoxy independent ic
LB11922 no.7497-5/15 pin assignment speed discriminator counts n number of counts high or open 512 low 1024 f fg = f osc (16 < number of counts > ) three-phase logic truth table (a high (h) input is the state where in + > in - .) f/r = l f/r = h output item in1 in2 in3 in1 in2 in3 pwm - 1 h l h l h l vh ul 2 h l l l h h wh ul 3 h h l l l h wh vl 4 l h l h l h uh vl 5 l h h h l l uh wl 6 l l h h h l vh wl s/s pin brk pin input condition condition input condition condition high or open stop high or open brake low start low released LB11922 35 in3 + in2 - in2 + 34 in1 + in1 - 33 32 31 30 29 28 36 27 26 25 24 23 22 21 20 19 wl wh v cc in3 - ul uh vl vh fgin + rfgnd rf gnd fgin - 10 11 12 13 14 15 16 17 18 xi xo fgout nc pwm int.out nc csd int.in 9 8 7 6 5 4 3 2 1 ld fgs pout dout f/r s/s n br vreg top view
LB11922 no.7497-6/15 block diagram ? + ? + fgin - fgin + fgo fgs ld fg rst x tal osc ecl 1/16 1/n lvsd comp tsd pri driver 1.3vref s/s br csd osc logic pwm osc n fg filter speed discriminator speed control system pll dout s/s int out int in pout br v cc fr ld ? + xi vreg vreg xo n gnd pwm rfgnd rf ul vl wl uh vh wh in3 + curr lim logic hall hys amp in3 - in2 - in2 + in1 - in1 + csd f/r v cc
LB11922 no.7497-7/15 pin functions pin no. pin name function equivalent circuit 1 vreg 7v shunt regulator output. 1 v cc 2 s/s start/stop control. low : 0 to 1.0v high : 2.0v to v cc goes high when left open. low for start. high or open for stop. the hysteresis is about 0.22v. v cc 3.5k 50k 2 3 f/r forward/reverse control. low : 0 to 1.0v high : 2.0v to v cc goes high when left open. low for forward. high or open for reverse. the hysteresis is about 0.22v. v cc 3.5k 50k 3 4 br brake control (short braking operation). low : 0 to 1.0v high : 2.0v to v cc goes high when left open. high or open for brake mode operation. the hysteresis is about 0.22v. v cc 3.5k 50k 4 5 n speed discriminator count switching. low : 0 to 1.0v high : 2.0v to v cc goes high when left open. the hysteresis is about 0.22v. v cc 3.5k 50k 5 continued on next page.
LB11922 no.7497-8/15 continued from preceding page. pin no. pin name function equivalent circuit 6 fgs fg amplifier output (after the schmitt circuit). this is an open collector output. 6 v cc 7 ld speed lock detection output. goes low when the motor speed is within the speed lock range ( 6.25%). 7 v cc 8 dout speed discriminator output. acceleration high, deceleration low 8 v cc 9 pout speed control syst em pll output. outputs the phase comparison result for clk and fg. 9 v cc 10 int in integrating amplifier inverting input. v cc 30k 30k 500 500 10 continued on next page.
LB11922 no.7497-9/15 continued from preceding page. pin no. pin name function equivalent circuit 11 int out integrating amplifier output (speed control). 11 v cc 40k 12 pwm pwm oscillator frequency setting. connect a capacitor between this pin and ground. 7.5k v cc 300 12 13 csd sets the operating time of the constrained-rotor protection circuit. reference signal oscillator used when the clock signal is cut off and to prevent malfunctions. the protection function operating time can be set by connecting a capacitor between this pin and ground. this pin also functions as the logic circuit block power-on reset pin. v cc 300 13 reset circuit 15 16 xo xi oscillator circuit connections. xo : output pin xi : input pin a reference clock can be generated by connecting an oscillator element to these pins. if an external clock with a frequency of a few mhz is used, input that signal through a series resistor of about 5.1k . the xo pin must be left open in this case. v cc 15 16 18 fgout fg amplifier output. this pin is connected to the fg schmitt comparator circuit internally in the ic. 18 v cc 40k fg schmitt comparator continued on next page.
LB11922 no.7497-10/15 continued from preceding page. pin no. pin name function equivalent circuit 19 20 fgin - fgin + fg amplifier inputs. fgin - : fg amplifier inverting input fgin + : fg amplifier noninverting input insert capacitors between these pins (which have a potential of 1/2 v cc ) and ground. 20 v cc 30k 30k 500 500 500 19 fgout 21 rfgnd output current detection. connect a resistor between this pin and ground. v cc 21 22 rf output current detection. connect a resistor between this pin and ground. the output limitation maximum current, i out , is set to be 0.26/rf by this resistor. v cc 22 23 gnd ground connection. 24 25 26 27 28 29 ul uh vl vh wl wh outputs (that are used to drive external transistors). these are push-pull outputs. the pwm duty is controlled on the uh, vh, and wh side of these outputs. 24 26 28 25 27 29 v cc 50k 30 v cc power-supply voltage. connect a capacitor between this pin and ground for power supply stabilization. 31 32 33 34 35 36 in3 - in3 + in2 - in2 + in1 - in1 + hall-effect device inputs. the input is seen as a high-level input when in + > in - , and as a low-level input for the opposite state. if noise on the hall-effect device signals is a problem, insert capacitors between the corresponding in + and in - inputs. the logic high state indicates that v in + > v in - . 36 34 32 v cc 500 500 31 33 35 14 17 nc these are unconnected pins, and can be used for wiring.
LB11922 no.7497-11/15 sample application circuit 1 (p-channel + n-channel, hall- effect sensor application) sample application circuit 2 (pnp + npn, hall-effect sensor application) s/s f/r br ld n fgs 24v LB11922 uh in2 + in1 + in1 - 36 35 34 33 31 30 29 28 27 in3 - in3 + v cc wh rfgnd rf ul 13 14 15 16 17 18 vl vreg pwm fgout nc xi int.out 9 8 7 6 5 4 3 2 1 ld fgs pout dout f/r n s/s 10 br in2 - gnd 11 12 26 25 32 vh wl int.in 24 23 22 21 20 19 nc fgin + fgin - csd xo LB11922 uh in2 + in1 + in1 - 36 35 34 33 31 30 29 28 27 in3 - in3 + v cc wh rfgnd rf ul 13 14 15 16 17 18 vl vreg pwm fgout nc xi int.out 9 8 7 6 5 4 3 2 1 ld fgs pout dout f/r n s/s 10 br in2 - gnd 11 12 26 25 32 vh wl int.in 24 23 22 21 20 19 nc fgin + fgin - csd xo s/s f/r br ld n fgs 24v + +
LB11922 no.7497-12/15 LB11922 description 1. speed control circuit this ic implements speed control using the combination of a speed discriminator circuit and a pll circuit. the speed discriminator circuit outputs (this counts a single fg period.) an error signal once every two fg periods. the pll circuit outputs an error signal once every one fg period. as compared to the earlier tech nique in which only a speed discriminator circuit was used, the combination of a speed discriminator and a pll circuit allows variations in motor speed to be better suppressed when a motor that has large load variations is used. the fg servo frequency (f fg ) is controlled to have the following relationship with the crystal oscillator frequency (f osc ). f fg = f osc (16 < number of counts > ) n number of counts high or open 512 low 1024 therefore it is possible to implement half-speed control w ithout switching the clock frequency by using combinations of the n1 = high, n2 = low state and other setting states. 2. reference clock this ic supports the use of either of the following methods for providing the speed control reference clock. (1) crystal oscillator use a circuit consisting of a crystal an d capacitors such as the one shown below to implement a crystal oscillator. c1 : used to prevent oscillation at upper harmonic frequencies. c2 : used for stabilization and to prevent oscillation at upper harmonic frequencies. c3 : used for oscillator coupling. oscillator frequency (mhz) c1 (pf) c2 (pf) c3 (pf) (values provided for reference purposes) 3 to 5 39 10 47 5 to 8 10 10 47 8 to 10 5 10 22 this circuit and these component values are only provided for reference purposes. when implementing a crystal oscillator in an application, it is necessa ry to consult the manufactur er of the crystal to verify that problems will not occur due to interactions between stray capacitan ces due to wiring in th e pcb and the crystal. notes : the capacitor c1 is effective at lowering negative resistance values at high frequencies, but care is required to assure that it does not excessively reduce the negativ e resistance at the fundamental frequency. since this crystal oscillator circuit is a high-frequency circu it, it can be easily influenced by stray capacitances on the pcb. to minimize stray capacitances, keep connections between external components as short as possible and use narrower line widths in the pcb patter. the c1 and c2 ground lines must be as short as possible, and must be connected to the ic's ground pin (pin 23, gnd). if the pcb lines are excessively long, the oscillator circuit may be influenced by fluctuations in the ground line voltage when, for example, the motor is overloaded, and the oscilla tor frequency may change. the c1 and c2 ground lines can be made shorter by using the nc pins next to the xi and xo pins for the c1 and c2 ground, and connecting those pins across the back of the ic to the ic gnd pin. c1 xi xo c2 c3
LB11922 no.7497-13/15 (2) external clock (a frequency equivalent to th at of the crystal oscillator circuit : a few mhz) if a signal from an external signal source with a frequency eq uivalent to that of the crystal oscillator circuit is used, input that signal to the ic through a series resistor (example value : 5.1k ). in this case, the xo pin must be left open. input signal levels (signal source) low-level voltage : 0 to 0.8v high-level voltage : 2.5 to 5.0v 3. output drive circuit to reduce power loss in the output, this ic adopts the direct pwm drive technique. the output transistors (which are external to the ic) are always saturated when on, and the motor drive output is adjusted by changing the duty with which the output is on. the pwm switching is performed on the high side for each phase (uh, vh, and wh). the pwm switching side in the output can be selected to be either the high or low side depending on how the external transistors are connected. 4. current limiter circuit the current limiter circuit limits the (peak) current at the value i = v rf /r f (v rf = 0.26v (typical), r f : current detection resistor). the current limitation operation consists of reducing the output duty to suppress the current. high accuracy detection can be achieved by connecting the rf and rfgnd pin lines near the ends of the current detection resistor (r f ). 5. speed lock range the speed lock range is 6.25% of the fixed speed. when the motor speed is in the lock range, the ld pin (an open collector output) goes low. if the motor sp eed goes out of the lock range, the motor on duty is adjusted according to the speed error to control the motor speed to be within the lock range. 6. notes on the pwm frequency the pwm frequency is determined by the capacitor (f) connected to the pwm pin. when v cc = 6.3v : f pwm 1/(82000 c) when v cc = 5.0v : f pwm 1/(66000 c) a pwm frequency of between 15 and 25khz is desirable. if the pwm frequency is too low, the motor may resonate at the pwm frequency during motor control, and if that frequency is in the audibl e range, that resonation may result in audible noise. if the pwm frequency is too high, the output transistor switching loss will in crease. to make the circuit less susceptible to noise, the connected capacitors must be co nnected to the gnd pin (pin 23) with lines that are as short as possible. 7. hall effect sensor input signals an input amplitude of over 100mvp-p is desirable in the hall effect sensor inputs. the closer the input waveform is to a square wave, the lower the required input amplitude. inversely, a higher input amplitude is required the closer the input waveform is to a triangular wave. also note that the input dc voltage must be set to be within the commonmode input voltage range. if noise on the hall inputs is a problem, that noise must be excluded by inserting capacitors across the inputs. those capacitors must be located as clos e as possible to the input pins. when the hall inputs for all three phases are in the sa me state, all the outputs will be in the off state. if a hall sensor ic is used to provide the hall inputs, those signals can be input to one side (either the + or - side) of the hall effect sensor signal inputs as 0 to v cc level signals if the other side is held fixed at a voltage within the common-mode input voltage range that applies when a hall effect sensors are used.
LB11922 no.7497-14/15 8. forward/reverse switching the motor rotation direction can be switched using the f/r pin. however, the following notes must be observed if the motor direction is switched while the motor is turning. ? this ic is designed to avoid through currents when sw itching directions. however, increases in the motor supply voltage (due to instantaneous return of motor current to the power supply) during direction switching may cause problems. the values of the capacitors inserted between power and ground must be in creased if this increase is excessive. ? if the motor current after direction switching exceeds the current limit value, the pwm drive side outputs will be turned off, but the opposite side output will be in the shor t-circuit braking state, and a current determined by the motor back emf voltage and the coil resistance will flow. applications must be designe d so that this current does not exceed the ratings of the output transistors used. (the higher the motor speed at which the direction is switched, the more severe this problem becomes.) 9. brake switching the LB11922 provides short-circuit braking implemented by turning the output transistors for the high side for all phases (uh, vh, and wh) on. (the opposite side transistors are turned off for all phases.) note that the current limiter does not operate during braking. during braking, the duty is set to 100%, regardless of the motor speed. the current that flows in the output transistors during braking is dete rmined by the motor back emf voltage and the coil resistance. applications must be designed so that th is current does not exceed the ratings of the output transistors used. (the higher the motor speed at which braking is applied, the more severe this problem becomes.) the braking function can be applied and released with the ic in the start state. this means that motor startup and stop control can be performed using the brake pin with the s/s pin held at the low level (the start state). 10. constraint protection circuit the lb1922m includes an on-chip constr aint protection circuit to protect the ic and the motor in motor constraint mode. if the ld output remains high (indicating the locked state) for a fixed period in the start state, the upper side (external) transistors are turned off. this time is set by the capacitance of the capac itor attached to the csd pin. when v cc = 6.3v : the set time (in seconds) is 74 c ( f) when v cc = 5.0v : the set time (in seconds) is 60 c ( f) to clear the rotor constrained protection state, the application must either switch to the stop state for a fixed period (about 1ms or longer) or turn off and reapply power. if the rotor constrained protection circuit is not used, a 220k resistor and a 1500pf capacitor must be connected in parallel between the csd pin and ground. since the csd pin also functions as the power-on reset pin, if the csd pin were connected directly to ground, the ic would go to the power-on reset state and motor drive operation would remain off. the power-on reset state is cleared when the cs d pin voltage rises above a level of about 0.64v. 11. low-voltage protection circuit the LB11922 includes a low-voltage protection circuit to protect against incorrect operation when power is first applied or if the power-supply voltage (v cc ) falls. the (external) upper side output transistors are turned off if v cc falls under about 3.75v (tpyical), and this function is cleared at about 4.0v (typical). 12. power supply stabilization since this ic is used in applications that draw large output currents, the power-supply line is subject to fluctuations. therefore, capacitors with ca pacitances adequate to stabilize the power-supply voltage must be connected between the v cc pin and ground. if diodes are inserted in the power-supply line to prevent ic destruction due to reverse power supply connection, since this makes the power-supply voltage even more subject to fluctuations, even larger capacitors will be required. 13. ground lines the signal system ground and the output system ground must be separated and a single ground point must be taken at the connector. since the output system ground carries large currents, this ground line must be made as short as possible. output system ground ... ground for rf and the output diodes signal system ground ... ground for the ic and the ic external components
LB11922 ps no.7497-15/15 14. vreg pin if a motor drive system is formed from a single power supply, the vreg pin (pin 1) can be used to create the powersupply voltage (about 6.3v) for this ic. the vreg pin is a shunt regulator and generates a voltage of about 7v by passing a current through an external resistor. a stable voltage can be generated by setting the current to value in the range 0.2 to 1.5ma. the external transistors must have current capacities of at least 80ma (to cover the i cc + hall bias current + output current < source > requirements) and they must have voltage handling capacities in excess of the motor power-supply voltage. since the heat generated by these transistor may be a problem, heat sinks may be required depending on the packages used. if the ic power-supply volt age (4.4 to 7.0v) is provided from an external circuit, apply that voltage directly to the v cc pin (pin 30). in that case, the vreg pin must either be left open or connected to ground. 15. fg amplifier the fg amplifier is normally implemented as a filter amplifier such as that shown in the application circuits to reject noise. since a clamp circuit has been added at the fg amplifier output, the output amplitude is clamped at about 3vp-p, even if the gain is increased. since a schmitt comparator is in serted after the fg amplifier, applications mu st set the gain so that the amplifier output amplitude is at least 250mvp-p. (it is desirable that the gain be set so that the amplitude is over 0.5vp-p at the lowest controlled speed to be used.) the capacitor inserted between the fgin + pin (pin 20) and ground is required for bias voltage stabilization. to make the connected capacitor as immune from noi se as possible, connect this capacitor to the gnd pin (pin 23) with a line that is as short as possible. 16. integrating amplifier the integrating amplifier integrates the speed error pulses and the phase error pulses and converts them to a speed command voltage. at the same time it also sets the contro l loop gain and frequency characteristics using external components. 17. nc pin since the nc pins are electrically open with respect to the ic itself, they can be used as intermediate connection points for lines in the pcb pattern. sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity high-reliability products, however, any and all semiconductor products fail or malfunction with some probabi lity. it is possible that these probabilistic failures or malfunction could give rise to acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of august, 2008. specifications and information herein are subject to change without notice.

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