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31407 ti pc 20060207-s00003 no.a0366-1/20 http://onsemi.com semiconductor components industries, llc, 2013 may, 2013 lb8503v overview the lb8503v is an improved functionality version of the lb8500 and lb8502 products that features the added functions listed below. the lb8503v supports bo th single-phase and three-phase applications. added functions ? supports origin shifting in the speed control function ? adds a dedicated pin for setting the soft start time this allows a longer start time to be set without reducing the response time when changing speed. ? fg output pin added functions and features ? achieves linear speed control applications can set the slope of the change in motor speed with change in the input duty. ? minimized speed fluctuations in the presence of line or load variations ? allows a minimum speed to be set ? soft start function ? settings using external capacitors and resistors (to support easier mass production of end products) ? supports both pwm duty and analog voltage control inputs monolithic digital ic dc fan motor speed control ic orderin g numbe r : ENA0366
lb8503v no.a0366-2/20 specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage v cc max v cc pin 18 v output current i o max e0 pin 3ma fg output pin output voltage v fg max fg out pin 18 v fg output pin output current i fg max fg out pin 10 ma allowable power dissipation pd max when mounted on a circuit board * 1 0.8 w operating temperature topr -30 to +95 c storage temperature tstg -55 to +150 c *1 specified circuit board : 114.3 76.1 1.6mm 3 , glass epoxy. allowable operating range at ta = 25 c parameter symbol conditions ratings unit supply voltage range 1 v cc 1 v cc pin 7.5 to 17 v supply voltage range 2 v cc 2 v cc pin, with v cc shorted to 6vreg 5.5 to 6.5 v output current i o e0 pin 2.5 ma 6v constant voltage output current i reg -5 ma ctl pin voltage v ctl 0 to 6vreg v lim pin voltage v lim 0 to 6vreg v vc1 pin voltage v ci 0 to 6vreg v electrical characteristics at ta = 25 c, v cc = 12v ratings parameter symbol conditions min typ max unit supply current i cc 5.5 6.5 ma 6v constant voltage output (vreg pin) output voltage vreg 5.8 6.0 6.2 v line regulation vreg1 v cc = 8 to 17v 40 100 mv load regulation vreg2 i o = -5 to 5ma 10 100 mv temperature coefficient vreg3 design target * 0 mv/ c integrating amplifier block (e01) common-mode input voltage range vicm 2.0 vreg v high-level output voltage v oh (e01) ieo1 = -0.2ma vreg - 1.2 vreg - 0.8 v low-level output voltage v ol (e01) ieo1 = 0.2ma 0.8 1.0 v integrating amplifier block (e03) high-level output voltage v oh (e03) ieo1 = -0.2ma vreg - 1.2 vreg - 0.8 v low-level output voltage v ol (e03) ieo1 = 0.2ma 0.8 1.0 v fgin pin high-level input voltage vfgh 3.0 vreg v low-level input voltage vfgl 0 1.5 v input open voltage vfgo vreg - 0.5 vreg v hysteresis vfgs 0.2 0.3 0.4 v high-level input current ifgh vfgin = 6vreg -10 0 10 a low-level input current ifgl vfgin = 0v -140 -110 a fgout pin output low saturation voltage vfg 0.2 0.3 v output leakage current ifgl 10 a continued on next page. stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
lb8503v no.a0366-3/20 continued from preceding page. ratings parameter symbol conditions min typ max unit rc pin high-level output voltage v oh (rc) 3.2 3.45 3.7 v low-level output voltage v ol (rc) 0.8 0.95 1.05 v clamp voltage v clp (rc) 1.5 1.65 1.8 v ctl pin high-level input voltage vcth 2.0 vreg v low-level input voltage vctl 0 1.0 v input open voltage vcto vreg - 0.5 vreg v high-level input current icth vfgin = 6vreg -10 0 10 a low-level input current ictl vfgin = 0v -140 -110 a c pin high-level input voltage v oh (c) vreg - 0.3 vreg - 0.1 v low-level input voltage v ol (c) 1.8 2.0 2.2 v lim pin input bias current ib(lim) -1 1 a common-mode input voltage range vilim 2.0 vreg v soft pin charge current ic(soft) 1.4 a operation voltage range visoft 2.0 vreg v vci pin input bias current ib(vci) -1 1 a common-mode input voltage range vivci 2.0 vreg v vco pin high-level output voltage v oh (vco) vreg - 0.2 v low-level output voltage v ol (vco) 2.0 v * the design specification items are de sign guarantees and are not measured. package dimensions unit : mm (typ) 3178b 5.2 4.4 6.4 0.22 0.65 (0.33) 18 9 16 0.5 0.15 1.5max 0.1 (1.3) sanyo : ssop16(225mil) 0 0.8 0.4 0.2 0.6 1.0 ? 20 80 60 40 20 0 100 ambient temperature, ta ? c allowable power dissipation, pd max ? w pd max ? ta specified circuit board : 114.3 76.2 1.6mm 3 glass epoxy board
lb8503v no.a0366-4/20 pin assignment pin functions pin no. pin description rc 1 one-shot multivibrator pulse width setting. connect a re sistor between this pin and vreg, and a capacitor between this pin and ground. soft 2 soft start time setting. connect a capacitor between this pin and vreg. vreg 3 6v regulator output. connect a capacitor between this pin and ground for stabilization. v cc 4 power supply. connect a capacitor between this pin and ground for stabilization. cvi 5 control voltage input cvo 6 duty pulse signal smoothed voltage output ctl 7 duty pulse signal input. the speed is controlled by the duty of this pulse signal. c 8 duty pulse signal smoothing. connec t a capacitor between this pin and vreg. lim 9 minimum speed setting. normally, the 6v regulator level is resistor divided to set this pin's input level. fgin 10 fg pulse input fgout 11 fg pulse output gnd 12 grand pin nc 13 nc pin ei 14 one-shot multivibrator output and integrating amplifier input. a capacitor must be connected between this pin and eo for this integration. eo1 15 integrating amplifier output. (for use with an accelerati ng driver ic if the command voltage becomes low (single-phase systems).) eo3 16 integrating amplifier inverting output. (for use with an accelerating driver ic if the command voltage becomes high (three-phase systems).) lb8503v top view 5 4 3 1 rc 2 vreg v cc ctl c 16 14 12 11 10 eo3 eo1 nc gnd fgin 6 7 8 15 13 9 lim fgout cvo cvi ei soft
lb8503v no.a0366-5/20 block diagrams and application examples combination with an accelerating driver ic when the command voltag e goes low (single-phase systems) r1 vreg lb8503v ctl vref edge fg r2 r3 r4 r5 c2 c3 c5 c4 c6 6vreg ctl signal v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 i lb01769 vreg c1 one-shot multivibrator
lb8503v no.a0366-6/20 combination with an accelerating driver ic when the command voltag e goes high (three-phase systems) r1 vreg ctl vref edge fg r2 r3 r4 r5 c2 c3 c4 c5 c6 6vreg ctl signal v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vctl vreg eo3 vreg c1 lb8503v i lb01770 one-shot multivibrator
lb8503v no.a0366-7/20 speed control diagrams startup timing (soft start) determined by the lim pin voltage for a larger rc time constant for a smaller rc time constant the slope is determined by the external constant connected to the rc pin. (rpm) speed minimum speed low ctl pin (pwm duty) high high eo1 pin voltage (v) low low eo3 pin voltage (v) high 0% 100% 0v variable speed full speed 6vreg low on duty high on duty set minimum speed lim voltage ctl pin eo pin eo1 voltage ctl pin stop v cc pin soft pin full speed stop full speed soft start the slope can be changed with the capacitor connected to the c pin (a larger capacitor increases the slo p e. )
lb8503v no.a0366-8/20 supplementary operational descriptions the lb8503v accepts a duty pulse input a nd an fg signal from the driver ic, and generates the driver ic control voltage so that the fg period (motor speed) becomes proportional to the control voltage. as shown in the figure below, the lb8503v generates a pulse signal from edges on the fg signal and then generates a pulse width waveform determined by the rc time constant in a one-shot multivibrator. the lb8503v then integr ates that pulse waveform to create the output driver ic control voltage (a dc voltage). it is also possible to change the slope of the vctl/speed relationship as shown in the speed control diagram in the previous section by changing the pulse width with the rc time constant. note, however, that since pulses determined by this rc tim e constant are used, variation in the rc components will appear as speed control errors. lb8503v driver ic fgin fg vth ctl ctl signal closed feedback loop fg edge pulse rc pin one-shot multivibrator trc(s) = 0.85rc slope due to the rc time constant eo
lb8503v no.a0366-9/20 pin setting procedures (provided for reference purposes) [rc pin] the slope in the speed control diagram is determined by the rc pin time constant. ctl duty (%) (rpm) 0% 100% motor full speed i lb01771 1. determine the fg signal frequency (f fg (hz)) at the motor's highest speed. (when 2 fg pulses are creat ed on each motor revolution.) f fg (hz)=2rpm/60 .........................................................(1) 2. determine the time constant for the rc pin. (let duty be the control duty at the highest motor speed. for example, 100% = 1.0, 60% = 0.6) rc=duty/(30.85f fg ) ............................................. (2) 3. determine the resistor and capacitor values the range of capacitors that can be used is from 0.01 to 0.015 f due to the charge capabilities of the rc pin circuit. therefore, an appropriate re sistor value can be determined from either (3) or (4) below from the result obtained in step 2 above. r=(rc)/0.01 f....................................................... (3) r=(rc)/0.015 f..................................................... (4) note that the temperature characteris tics of the curve are determined by the temperature characteristics of the capacitor connected to the rc pin. a capacitor with excellent temperatur e characteristics must be used to minimize motor speed variation with temperature.
lb8503v no.a0366-10/20 [cvo and cvi pins] these pins determine the origin of the slope. (to se t the origin to 0% at 0 rpm, short cvo to cvi.) 1. x axis shift (resistor dividing the cvo to ground potential) ctl duty (%) (rpm) 0% 100% motor full speed x axis shift to shift the characteristics from a 0% = 0 rpm origin to a s ituation where the speed at a duty of 30% is shifted to 0%: first, determine the required cvi pin input voltage at 0%. cvi = 6 - (4 duty) = 6 - (4 0.3) = 6 - 1.2 = 4.8v next, when cvo is 6v, determine the resistor values for the resistor divider between cvo and ground such that the midpoint becomes 4.8v. cvo - cvi : cvi - ground = 1.2v : 4.8v = a ratio of 1 : 4. from the above, the desired resistor values will be 20k between cvo and cvi and 80k between cvi and ground. note that the slope will change. (in this case, since the resist or ratio is 1:4, the result will be 4/5 of (or 0.8 times) the original slope.) if required, the rc pin resistor value must be changed to correct the slope. ilb01773 ctl vref cvi soft lim c cvo ctl r4 r5
lb8503v no.a0366-11/20 2. y axis shift (resistor dividing the cvo to v cc potential) ctl duty (%) (rpm) 0% 100% motor full speed x axis shift to shift the characteristics from a 0% = 0 rpm origin to a situation where the speed is 0 rpm at a duty of 30%: first, determine the required cvo pin input voltage at 0%. cvo = 6 - (4 duty) = 6 - (4 0.25) = 6 - 1 = 5v determine the resistor values such that at cvo = 5 v, cvi becomes 6v. cvo - cvi : cvi - v cc = 1 v : 6v = a ratio of 1:6. from the above, the desired resistor values will be 20k between cvo and cvi and 80k between cvi and ground. (due to the current capability of the cvo pin, the total resistor value must exceed 100k .) note that the slope will change. (in this case, since the resist or ratio is 1:6, the result will be 6/7 of (or 0.86 times) the original slope.) if required, the rc pin resistor value must be changed to correct the slope. ilb01775 v cc ctl vref cvi soft lim c cvo ctl r4 r5
lb8503v no.a0366-12/20 [lim pin] the minimum speed is determined by the lim pin voltage. cvo pin voltage (v) 0 10000 8000 6000 4000 2000 6v 2v set minimum speed ctl duty (%) (rpm) 0% 100% motor full speed 1. determine the ratio of the required minimum speed and the maximum speed. ra = minimum speed/maximum speed......... (1) in the example in the figure above, ra = minimum speed/maximum speed = 3000/10000 = 0.3 2. determine the product of the duty that produces the maximum speed and the value from equation 1. ca = maximum speed duty ra .................. (2) for example, ca = maximum speed duty ra = 0.8 0.3 = 0.24 3. determine the required lim pin voltage lim = 6 - (4 ca) ....................................... (3) for example, lim = 6 - (4 ca) = 6 - (4 0.24) 5v 4. generate the lim voltage by resistor dividing the 6 v regulator voltage. for example, the resistor ratio to create a 5v level will be 1:5. thus the resistor values will be 10k between 6vreg and lim and 51k between lim and ground. ilb01777 6vreg vref cvi soft lim
lb8503v no.a0366-13/20 [c pin] since a capacitor that can smooth the pin voltage is connected to the c pin, if the ctl pin input signal frequency is f (hz), then the capacitor must meet the following conditio n. (here, r is the ic internal resistance of 180 (typical).) 1/f = t < rc note that the larger the capacitor, the slower its response to changes in the input signal will be. c pin vref circuit 180k ctl circuit ctl pin ctl pin input inverted waveform (the frequency is the same) a capacitor that can smooth the pin voltage is connected here. 1/f = t < cr 6vreg
lb8503v no.a0366-14/20 application example 2 [setting the minimum speed for an origin of 0% = 0 rpm] pwm duty (%) (rpm) 0% 100% motor full speed set minimum speed r1 vreg lb8503v ctl vref edge fg r2 r3 c2 c3 c4 c5 c6 6vreg ctl signal v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 vreg c1 one-shot multivibrator when the speed control diagram origin is 0% = 0 rpm, the cvo pin is connected to the cvi pin. if the minimum speed is not set, conn ect the lim pin to the 6vreg pin.
lb8503v no.a0366-15/20 application example 3 [origin shift in the y direction (the motor turns at 0%)] pwm duty (%) (rpm) 0% 100% motor full speed vreg lb8503v ctl vref edge fg r3 r4 r5 c2 c3 c4 c5 c6 6vreg ctl signal v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 vreg c1 one-shot multivibrator when the speed control diagram origin is set so the motor turns at 0%, the cvo pin to ground potential difference is resistor divided and the midpoint is input to the cvi pin. the speed at 0% can be changed with the resistor ratio.
lb8503v no.a0366-16/20 application example 4 [origin shift in the x axis direction (t he motor turns at a duty of 10% or higher) plus a minimum speed setting] pwm duty (%) (rpm) 0% 100% motor full speed vreg lb8503v ctl one-shot multivibrator vref edge fg r3 r4 r5 c2 c3 c4 c5 c6 6vreg ctl signal v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 vreg c1 when the origin in the speed control diagram is set so th at the motor starts turning when the duty is above 0%. the potential difference between the cvo pin and v cc is resistor divided, and that divided level is input to the cvi pin. the duty at which rotation starts can be changed by changing the resistor ratio. note that the total value of the re sistors r4 and r5 must exceed 100k .
lb8503v no.a0366-17/20 application example 5 [dc voltage speed control] cv1 pin voltage (v) 0 6v 2 v set minimum speed (rpm) motor full speed r1 vreg lb8503v ctl one-shot multivibrator vref edge fg r2 r3 c2 c3 c4 c5 c6 6vreg dc voltage v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 vreg when the motor speed is controlled by a dc voltage, that voltage must be in the range from 2v to 6vreg. note that the motor stops when the control voltage is at 6vreg, and the motor speed in creases as the voltage falls.
lb8503v no.a0366-18/20 application example 6 [fixed speed + soft start] ctl signal (pwm duty) c pin voltage (rpm) 0% 20% 100% 80% 60% 40% motor full speed 6v r1 vreg lb8503v ctl vref edge fg r2 r3 c2 c3 c4 c5 c6 6vreg v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 vreg one-shot multivibrator with this circuit, the motor speed remains constant even if there are fluctuations in the supply voltage or static voltage. it is also possible to input a fixed-duty signal to the ctl pin signal input as an input signal for which soft start is enabled at startup.
lb8503v no.a0366-19/20 application example 7 [used in combination with the lb11660fv] r1 vreg lb8503v lb11660fv/rv ctl vref edge fg r2 r3 r4 r5 c2 c3 c4 c5 c6 6vreg ctl signal v cc 12v cvi soft lim rc c cvo ctl fgin fgout eo1 ei gnd fg vth vreg eo3 vreg c1 one-shot multivibrator in this circuit, the dynamic range of the lb8503v eo pin (the range from the amplifier block output high to output low levels) must be wider than the dynamic range (from the high to low levels of the pwm signal) of vth pin of driver ic with which this ic is combined. however, since the lb11660fv pwm low-level voltage is lower than the lb8503v amplifier output low-level voltage, it must be resistor divided.
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