82008 ms pc/o3003si (ot) no.7229-1/10 http://onsemi.com semiconductor components industries, llc, 2013 may, 2013 lb11920 overview the lb11920 is a direct pwm drive motor driver ic for 3-phase power brushless motors. the pwm duty can be controlled by ic inputs, and it can be used over the wide supply voltage range of 9.5 to 30v. features ? three-phase bipolar drive (35v, 3.5v) ? direct pwm drive ? built-in high and low side kickback absorbing diodes ? braking function (short-circuit braking) ? built-in forward/reverse direction switching circuit ? full complement of built-in protection circuits, includi ng current limiter, low-voltage protection, motor lock (physical constraint) protection, and thermal protection circuits ? the pwm duty can be controlled by ic inputs specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage 1 vm max 35 v supply voltage 2 v cc max 7v output voltage v out max out1 to out3 35 v output current i o max t 500ms 3.5 a pd max1 independent ic 3 w allowable power dissipation pd max2 with an infinitely large heat sink. 20 w operating temperature topr -20 to +80 c storage temperature tstg -55 to +150 c monolithic digital ic for oa products three-phase brushless motor driver orderin g numbe r : EN7229b 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.
lb11920 no.7229-2/10 allowable operating conditions at ta = 25 c parameter symbol conditions ratings unit supply voltage range 1 vm 9.5 to 30 v supply voltage range 2 v cc 4.5 to 5.5 v hp pin applied voltage vhp 0 to 32 v hp pin output current ihp 0 to 3 ma electrical characteristics at ta = 25 c, vm = rf = 27v, v cc = 5v ratings parameter symbol conditions min typ max unit supply current 1 iv cc -1 v cc pin 9 13 ma supply current 2 iv cc -2 v cc pin at stop mode 2.0 3.0 ma output block output saturation voltage 1 v o sat1 i o = 1.0a, v o (sink) + v o (source) 1.7 2.4 v output saturation voltage 2 v o sat2 i o = 2.0a, v o (sink) + v o (source) 2.0 2.9 v output saturation voltage 3 v o sat3 i o = 3.0a, v o (sink) + v o (source) 2.4 3.5 v output leakage current i o leak 100 a output delay time 1 td1 pwmin ?h? ?l? 1.25 2.5 s output delay time 2 td2 pwmin ?l? ?h? 1.8 3.6 s lower diode forward 1 vd1-1 id = -1.0a 1.1 1.5 v lower diode forward 2 vd1-2 id = -2.0a 1.3 1.9 v lower diode forward 3 vd1-3 id = -3.0a 1.5 2.3 v upper diode forward 1 vd2-1 id = 1.0a 1.3 1.7 v upper diode forward 2 vd2-2 id = 2.0a 2.0 2.7 v upper diode forward 3 vd2-3 id = 3.0a 2.7 3.7 v hall amplifier input bias current ihb -2 -0.1 a common-mode input voltage range 1 vicm1 hall device used 0.5 v cc -2.0 v common-mode input voltage range 2 vicm2 for i nput one-side bias (hall ic application) 0 v cc v hall input sensitivity at differential input 50 mvp-p hysteresis width v in 20 30 50 mv input voltage low high vslh 5 15 25 mv input voltage high low vshl -25 -15 -5 mv pwm oscillator output h level voltage v oh (pwm) 2.75 3.0 3.25 v output l level voltage v ol (pwm) 1.0 1.2 1.3 v external c charge current ichg(pwm) vpwm = 2.1v -60 -45 -30 a oscillator frequency f (pwm) c = 1000pf 15.8 20 24.2 khz amplitude v (pwm) 1.6 1.8 2.1 vp-p csd circuit operating voltage v oh (csd) 3.6 3.9 4.2 v external c charge current ichg (csd) vcsd = 0v -15 -11 -7 a operating time t (csd) c = 10 f, design target value* 3.5 s hp pin output low level voltage v ol (hp) ihp = 2ma 0.1 0.4 v output leakage current ileak(hp) vhp = 30v 10 a thermal shutdown operation thermal shutdown operating temperature ttsd design target value* (junction temperature) 150 180 c hysteresis width tsd design target value* (junction temperature) 45 c current limiter circuit (rf pin) limiter voltage vrf 0.45 0.5 0.55 v note : * this parameter is a design target value and is not measured. continued on next page.
lb11920 no.7229-3/10 continued from preceding page. ratings parameter symbol conditions min typ max unit low-voltage protection circuit operating voltage vsdl 3.6 3.8 4.0 v release voltage vsdh 4.1 4.3 4.5 v hysteresis width vsd 0.35 0.5 0.65 v pwmin pin input frequency f (pi) 50 khz h level input voltage v ih (pi) 2.0 v cc v l level input voltage v il (pi) 0 1.0 v input open voltage v io (pi) v cc -0.5 v cc v hysteresis width v is (pi) 0.15 0.25 0.35 v h level input current i ih (pi) vpwmin = v cc -10 0 10 a l level input current i il (pi) vpwmin = 0v -116 -87 -58 a s/s pin h level input voltage v ih (s/s) 2.0 v cc v l level input voltage v il (s/s) 0 1.0 v input open voltage v io (s/s) v cc -0.5 v cc v hysteresis width v is (s/s) 0.15 0.25 0.35 v h level input current i ih (s/s) vs/s = v cc -10 0 10 a l level input current i il (s/s) vs/s = 0v -116 -87 -58 a f/r pin h level input voltage v ih (f/r) 2.0 v cc v l level input voltage v il (f/r) 0 1.0 v input open voltage v io (f/r) v cc -0.5 v cc v hysteresis width v is (f/r) 0.15 0.25 0.35 v h level input current i ih (f/r) vf/r = v cc -10 0 10 a l level input current i il (f/r) vf/r = 0v -116 -87 -58 a br pin h level input voltage v ih (br) 2.0 v cc v l level input voltage v il (br) 0 1.0 v input open voltage v io (br) v cc -0.5 v cc v hysteresis width v is (br) 0.15 0.25 0.35 v h level input current i ih (br) vbr = v cc -10 0 10 a l level input current i il (br) vbr = 0v -116 -87 -58 a package dimensions unit : mm (typ) 3174c sanyo : dip28h(500mil) 1 14 28 15 0.4 0.6 4.0 4.0 26.75 20.0 r1.7 8.4 (1.81) 1.78 1.0 12.7 11.2 pd max -- ta ambient temperature, ta ? c allowable power dissipation, pd max ? w 0 16 20 4 12 8 3 24 ? 20 80 60 20 40 0 100 with an infinitely large heat sink independent ic
lb11920 no.7229-4/10 pin assignment truth table source f/r = ?l? f/r = ?h? sink in1 in2 in3 in1 in2 in3 1 out2 out1 h l h l h l 2 out3 out1 h l l l h h 3 out3 out2 h h l l l h 4 out1 out2 l h l h l h 5 out1 out3 l h h h l l 6 out2 out3 l l h h h l s/s pin pwmin pin input condition condition input condition condition h or open stop h or open output off l start l output o br pin input condition condition h or open - l brake the pwmin pin must be held at the low-level voltage when th is ic is operated with a voltage applied to the toc pin. out1 gnd2 in3 + in3 - in2 + in2 - out2 out3 gnd2 nc vm in1 + in1 - v cc gnd1 csd pwm toc rf gnd3 hp br pwmin f/r s/s vm rf nc lb11920 top view 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15
lb11920 no.7229-5/10 block diagram csd circuit curr lim hall logic hall hys amp driver logic tsd out1 out2 out3 rf rf vm 27v csd in1 in2 in3 gnd2 pwm osc f/r s/s lvsd pwm f/r ? + br pwmin vref br pwm in s/s toc v cc hp 5v v cc reset gnd3 gnd1 + + + h h h
lb11920 no.7229-6/10 pin functions pin no. pin name function equivalent circuit 28 1 2 out1 out2 out3 motor drive output pin. 3, 26 gnd2 output gnd pin. 5, 25 vm power pin. 6, 24 rf output tr power and output current detector pins, which connect low resistance (rf) to vm. the output current is limited to the current value set with i out = v rf /rf. 300 rf vm 5 25 6 24 1 2 28 3 26 7 hp hall element signal three-phase composite output. withstand voltage 35v max. v cc 7 8 br brake input pin. ?l? for brake and ?h? or open for normal rotation. v cc 50k 3.5k 8 9 pwmin pwm pulse input pin. l for output drive and h or open for output off. v cc 50k 3.5k 9 10 f/r forward/reverse input pin. v cc 50k 3.5k 10 continued on next page.
lb11920 no.7229-7/10 continued from preceding page. pin no. pin name function equivalent circuit 11 s/s start/stop control pin. start with l and stop with h or in the open condition. v cc 50k 3.5k 11 12 v cc control circuit power pin. 13 gnd1 gnd pin (control circuit block). 14 pwm pin to set the pwm oscillation frequency. connect a capacitor between this pin and gnd. v cc 2k 200 14 15 toc pwm waveform comparator pin. normally use with ?l? or open. to control the output duty by applying the voltage to this pin without using the pwmin pin, set the pwmin pin to ?l?. v cc 50k 15 16 csd pin to set the operation time of motor lock protection circuit. insertion of a capacitor (about 10 f) between csd and gnd enables setting of the protection operation time of about 3.5sec. v cc 500 300 16 continued on next page.
lb11920 no.7229-8/10 continued from preceding page. pin no. pin name function equivalent circuit 18 17 20 19 22 21 in1 + in1 - in2 + in2 - in3 + in3 - hall amplifier input. in + > in - is the input high state, and the reverse is the input low state. connect a capacitor between the in + and in - inputs if there is noise in the hall sensor signals. v cc 300 300 19 21 23 18 20 22 23 gnd3 subgnd pin to connect to gnd1 that is gnd of the control circuit. 4 27 nc nc pin that can be used for wiring. lb11920 description 1. output drive circuit this ic is of a direct pwm drive type that suffers less power loss at the output. on the basis of the signal (?h? level for off and ?l? level for on) entered in the pwmin pin, the lower output tr performs pwm switching, causing ch ange in the motor drive power. to control by means of the dc voltage, apply the voltage to the toc pin (in this case, the pwmin pin should be in the ?l? level input condition). the toc pin voltage is compared with the oscillation voltage of pwm pin, determining the duty. as the toc pin voltage is lower, the output duty increases. 2. hall input signal for hall input, entry of the signal whose amplitude is larg er than the hysteresis width (50mv max) is necessary. considering effects of noise and phase delay, entry of the amplitude of 120mvp-p (at differential input) or more is recommended. when noise causes disturbance in the output waveform (at phase switching) or in the hp output (hall signal three-phase composite output), insert a capacitor, etc. as ne ar as possible to the pin between inputs to prevent such effects. the hall input is used as a signal for judgment of the input of the motor lock protection circuit. though it is designed to ignore noise to a certain extent, due attention should be paid to check for incorrect opera tion of the protection circuit. both upper and lower outputs are off when all three-phases of hall input signal are in the common-mode input condition. when the hall ic output is to be entered, entry of 0 - v cc can be made for another single-side input by fixing either one side (+ or -) of input to the voltage within the common-mode input range with the hall element used. 3. current limiting circuit the current limiting circuit performs limitin g with the current determined from i = v rf /rf (v rf = 0.5vtyp, rf : current detector resistance) (that is, th is circuit limits the peak current). the control operation functions to reduce the on stat e duty of the output and thus reduce the current. switching during current limiting is made on the ba sis of the frequency oscillated with the pwm pin. the pwm frequency is determined from the capacitance c (f) of cap acitor connected to the pwm pin. f pwm 1/ (50000 c) the pwm frequency of 15k to 25khz is recommended. as pw m oscillation is used also as a clock signal of the internal logic circuit, its oscillation is necessary even in the application where curre nt limiting is not needed. 4. power save circuit this ic enters the power save condition to decrease the current dissipation in the stop mode. in this condition, the bias current of most of circuits is cut off.
lb11920 no.7229-9/10 5. forward/backward changeover the motor rotation can be changed over with the f/r pin. following cautions should be observed when f/r changeover is to be made while the motor is running : ? the circuit incorporates a measure agai nst the through current at a time of chan geover. however it is necessary to take an appropriate measure to prevent the voltage from exceeding the rated voltage (35v) because of rising of the vm voltage at changeover (instantaneous return of the motor current to the power supply). when this is a problem, increase the capacitance of a capacitor between vm and gnd. ? when the motor current after changeover is the current limit or more, the lower tr is turned off. but the upper tr enters the short-brake condition, and the current determined from the motor counter-electromotive voltage and coil resistance flows. it is necessary to pr event this current from exceeding the rate d current (3.5a). (f/r changeover at high rotation speed is dangerous.) 6. brake operation brake operation is made through setting of the br pin to th e ?l? level. this operation consists of a short-brake operation in which all of lower outputs are turned off while all of upper outputs are turned on. while the brake is operating, current limiting and motor lock protection circuits are not operative. apply brake only when the current during operation does not exceed the rated current (3.5a). the circuit incorporates a measure agains t the through current at a time of changeover. however it is necessary to take an appropriate measure to prevent the voltage from exceeding the rated voltage (35v) because of rising of the vm voltage at changeover (instantaneous return of the motor curr ent to the power supply). when this is a problem, increase the capacitance of a capac itor between vm and gnd. 7. motor lock protection circuit a motor lock protection circuit is incorporated for pr otection of ic and motor when the motor is locked. the lower output tr is turned off when the hall input signal is not switched for a certain period in the motor drive condition. the time is set by means of a capacity of a capacitor connected to the csd pin. time setting of about 3.5sec is possible for the capacitance of 10 f. (variance 30%) set time (s) 0.35 c ( f) due care must be taken on any leakage cu rrent in the capacitor used because it may adversely affect error of the set time, etc. to cancel the motor lock protection condition, one of following steps must be taken : ? stop mode ? maintaining the output duty 0% condition through input of pwmin or toc for more than the period of tpwm 8. (tpwm : ic internal pwm oscillation period) ? power must be applied again (in the stop condition). connect the csd pin to gnd when the motor lock protection circuit is not to be used. the motor lock protection active period at restart becomes sh orter than the setting when the stop time to cancel motor lock protection is shorter because the ch arge of capacitor cannot be fully disc harged. therefore, it is necessary to provide a certain allowance to the stop period while referring to the following formula as a guideline. stop time (ms) 15 c ( f) 8. circuit for low-voltage protection this circuit detects the voltage applied to the v cc pin. when this voltage drops below the operation voltage (see the electric characteristics), the lower side output is turned off. to prevent repetition of output on/off near the protection activation voltage, the hysteresis is provided. ac cordingly, the output is not recovered unless the voltage rises by about 0.5v above the activation voltage. 9. hp output for the hp output, the composite signal of three phases of hall element signal is output. this is an open collector output. this can be used for the motor rotation detection signal, etc.
lb11920 ps no.7229-10/10 10. power supply stabilization this ic has a large output current, which causes deviation of the power line readily. to en sure stability, it is necessary to insert a capacitor with sufficient cap acitance between the vm pin and gnd. to eliminate the high-frequency noise due to switching, insert a ceramic capacitor of about 0.1 f as near as possible to the pin between vm (pin 5) and gnd 2 (pin 3). when inserting diode in the power line to prevent breakdown due to reverse connection of power supply, select the sufficiently large capacitan ce because the power line tends to develop deviation readily. the v cc voltage that is a control power supply must also be fu lly stabilized by means of a capacitor when such voltage tends to fluctuate because of routing. 11. routing of a printed circuit board two pins are provided for each of vm, rf, and gnd2 pins where large current flows. on the printed circuit board, both of these pins should be connected and used. if the use of only one pin is possible in certain cases, use pins 3, 5, and 6. gnd3 that is a sub-gnd (internal separation layer) should be connected with control gnd or gnd1 with the shortest possible wiring. on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc). scillc owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. a listing of scillc?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent-marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc mak es no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability ar ising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequentia l or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s techn ical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorize d for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other appli cation in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture o fthe part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws a nd is not for resale in any manner.
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