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32207 ms im 20070301-s00003 / d0606 mh im 20060619-s00002 no.a0609-1/15 http://onsemi.com semiconductor components industries, llc, 2013 may, 2013 LB11850VA overview the LB11850VA is a single-phase bipolar fan motor driver with speed control function that works with a speed feedback signal. a highly efficient, quiet and low power consumption motor driver circuit, with a high speed accuracy and large variable speed can be implemented by adding a sma ll number of external components. this pre-driver is optimal for driving large scale fan moto rs (with large air volume and large current) such as those used in servers and consumer products. functions and features ? pre-driver for single-phase full-wave drive pmos-nmos is used as an external power tr, enabling high-efficiency and low-power-consumption drive by means of the low-saturation output and single-phase full-wave drive. ? on-chip speed control circuit the speed control (closed loop control) using a speed feedback signal makes it possible to achieve higher speed accuracy and lower speed fluctuations when supply voltage fluctuates or load fluc tuates, compar ed with an open-loop control system. separately excited upper direct pwm control method is used as the variable-speed control system. ? external pwm input or analog voltage input enabling variable speed control the speed control input signal is compatible with pwm duty ratio or analog voltages. ? on-chip soft start circuit ? lowest speed setting pin the lowest speed can be set with the external resistor. ? current limiter circuit incorporated chopper type current limit at start or lock. ? reactive current cut ci rcuit incorporated reactive current before phase change is cut to enable silent and low-consumption drive. ? constraint protection and automatic reset functions incorporated ? fg (speed detection), rd (lock detection) output ? constant-voltage output pin for hall bias ordering number : ena0609a monolithic digital ic for fan motor single-phase full-wave pre-driver with speed control function
LB11850VA no.a0609-2/14 specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit v cc maximum supply voltage v cc max 18 v outn pin maximum output current i out n max 20 ma outp pin maximum sink current i out p max 20 ma out pin output withstand voltage v out max 18 v hb maximum output current hb 10 ma ctl, c pin withstand voltage ctl, c max 7v cvi, lim pin withstand voltage cvi, lim max 7v rd/fd output pin output withstand voltage fg max 19 v rd/fg output current fg max 10 ma 5vreg pin maximum output current i5vreg max 10 ma allowable power dissipation pd max mounted on a specified board * 0.9 w operating temperature range topr -30 to +95 c storage temperature range tstg -55 to +150 c note *1: mounted on a specified board: 114.3mm 76.1mm 1.6mm, glass epoxy. note *2: tj max = 150 c. use the device in a condition that the chip temperature does not exceed tj = 150 c during operation. recommended operating ranges at ta = 25 c parameter symbol conditions ratings unit v cc supply voltage 1 v cc 1 v cc pin 5.5 to 16 v v cc supply voltage 2 v cc 2 when v cc -5vreg shorted 4.5 to 5.5 v ctl input voltage range vctl 0 to 5vreg v lim input voltage range vlim 0 to 5vreg v vci input voltage range vcvi 0 to 5vreg v hall input common phase input voltage range vicm 0.2 to 3 v electrical characteristics at ta = 25 c, v cc = 12v, unless otherwise specified ratings parameter symbol conditions min typ max unit i cc 1 during drive 12 15 ma circuit current i cc 2 during lock protection 12 15 ma 5vreg voltage 5vreg i5vreg = 5ma 4.8 5.0 5.2 v hb voltage vhb ihb = 5ma 1.05 1.20 1.35 v current limiter voltage vlim 190 210 230 mv cpwm pin h level voltage vcrh 2.8 3.0 3.2 v cpwm pin l level voltage vcrl 0.9 1.1 1.3 v cpwm pin charge current icpwm1 vcpwm = 0.5v 24 30 36 a cpwm pin discharge current icpwm2 vcpwm = 3.5v 21 27 33 a cpwm oscillation frequency fpwm c = 220pf 30 khz ct pin h level voltage vcth 2.8 3.0 3.2 v ct pin l level voltage vctl 0.9 1.1 1.3 v ct pin charge current ict1 vct = 2v 1.6 2.0 2.5 a ct pin discharge current ic t2 vct = 2v 0.16 0.20 0.25 a ct pin charge/discharge current ratio rct ict1/ict2 8 10 12 times outn pin output h voltage vonh i o = 10ma v cc -0.85 v cc -1.0 v outn pin output l voltage vonl i o = 10ma 0.9 1.0 v outp pin output l voltage vopl i o = 10ma 0.5 0.65 v 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.
LB11850VA no.a0609-3/14 continued from preceding page. ratings parameter symbol conditions min typ max unit hall input sensitivity vhn in + , in - difference voltage (including offset and hysteresis) 15 25 mv fg output l voltage vfgl ifg = 5ma 0.15 030 a fg pin leak current ifgl vfg = 19v 30 a rd output l voltage vrdl ird = 5ma 0.15 0.30 v rd pin leak current irdl vrd = 19v 30 a eo pin output h voltage veoh ieo1 = -0.2ma vreg-1.2 vreg-0.8 v eo pin output l voltage veol ieo1 = 0.2ma 0.8 1.1 v rc pin output h voltage vrch 3.2 3.45 3.7 v rc pin output l voltage vrcl 0.7 0.8 1.05 v rc pin clamp voltage vrcclp 1.3 1.5 1.7 v ctl pin input h voltage vctlh 2.0 vreg v ctl pin input l voltage vctll 0 1.0 v ctl pin input open voltage vctlo vreg-0.5 vreg v ctl pin h input h current ictlh vfgin = 5vreg -10 0 10 a ctl pin l input l current ictll vfgin = 0v -120 -90 a c pin output h voltage vch vreg-0.3 vreg-0.1 v c pin output l voltage vcl 1.8 2.0 2.2 v lim pin input bias current iblim -1 1 a lim pin common phase input vo ltage range vilim 2.0 vreg v soft pin charge current icsoft 1.0 1.3 1.6 a soft pin operating voltage range visoft 2.0 vreg v cvi pin input bias current ib(vci) -1 2 a cvi pin common phase input voltage range vivci 2.0 vreg v cvo pin output h level voltage v oh (vco) vreg-0.35 vreg-0.2 v output l level voltage v ol (vco) 1.8 2.0 2.2 v package dimensions unit : mm (typ) 3287 sanyo : ssop24(225mil) 6.4 6.5 0.5 4.4 (0.5) (1.3) 24 13 1 12 0.22 0.5 0.15 0.1 1.5max pd max -- ta -30 0 30 60 90 120 95 0 0.2 0.4 0.6 0.8 1.2 1.0 0.9 ambient temperature, ta -- c allowable power dissipation, pd max -- w mounted on a specified board: 114.3 76.1 1.6mm 3 ,glass epoxy
LB11850VA no.a0609-4/14 pin assignment truth table lock protection cpwm = h in - in + ct out1p out1n out2p out2n fg mode h l l l off h l out1 2 drive l h l off h l l off out2 1 drive h l off l off h l l h h off h off l off lock protection speed control ct = l eo cpwm in - in + out1p out1n out2p out2n mode h l l l off h out1 2 drive l h l h off h l l out2 1 drive h l off l off h h l l h off h off l regeneration mode 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 LB11850VA out2p out2n v cc sence cvi cvo ctl rc soft cpwm fg rd out1p out1n sgnd 5vreg c eo ei lim ct in + hb in - top view
LB11850VA no.a0609-5/14 block diagram 1shot- multi edeg vreg vref ctl v cc soft lim rc 5vreg ei eo hall- bias oscillation control circuit hall sense hb in + in - fg cpwm ct gnd out2p out2n out1p out1n rd cvo cvi c ctl signal thermal shat down 5vreg discharge circuit fg ctl v cc ilb01797
LB11850VA no.a0609-6/14 sample application circuit *5 *2 v cc fg out1p out1n sgnd cpwm cp=220pf 30khz in + in - lim cvo ct ct=1 to 100k 1 *1 *3 *4 *6 *7 *8 *9 (1) (2) (3) (4) (1) (2) (3) (4) h rd hb rc cvi c ctl ctlsignal ei eo 100 LB11850VA
LB11850VA no.a0609-7/14 description of pre-driver block *1: sgnd is connected to the contro l circuit power supply system. *2: for the signal-side power stabilization capac itor, the capacitance of more than 0.1 f is used. connect the capacitor between v cc and gnd with the thick pattern and along the shortest route. *3: for the power-side power stabilization capac itor, the capacitance of more than 0.1 f is used. connect the capacitor between power-side power supply an d gnd with the thick pattern and along the shortest route. *4: hall signal input pins wiring needs to be short to prevent carrying noise . if noise is carried, insert a capacitor between in + and in - . the hall input circuit is a comparator having a hysteresis of 15mv. it has a 30mv (input signal difference voltage) soft switch zone. it is recommended that the hall input level is 100mv (p-p) at the minimum. *5: this is the pin to connect capacitor for generating the pwm basic frequency use of cp = 220pf produces oscillation at the frequency of 30khz which serves as the pwm basic frequency. since this pin is also used for the current limiter reset signal, the capacitor must be connected without fail even when no speed control is implemented. *6: this is the pin to connect capacitor for lock detection constant-current charging and constant-current discharging circuits are incorporated. when the pin voltage becomes 3.0v, the safety lock is applied, and when it lowers to 1.0v, the lock protection is reset. connect this pin to gnd when it is not in use (when lock protection is not required). *7: this is the pin for current limiter detection when the pin voltage exceeds 0.21v, current limiting is applied, and the low-side regeneration mode is established. connect this pin to gnd when it is not in use. *8: lock detection pin this is the open collector output, which outputs ?l? during rotation and ?h? at stop. this pin is left open when it is not in use. *10: speed detection pin. this is the open collector output, which can detect the rotation speed using the fg output according to the phase change. this pin is left open when it is not in use.
LB11850VA no.a0609-8/14 description of speed control block 1) speed control diagram 2) timing at startup (soft start) determined by lim pin voltage cr time constant large cr time constant small the speed slope is determined by t he constant of the rc pin. (rpm) rotation speed minimum speed small ctl signal (pwmduty) large large eo pin voltage (v) small 0% 100% 0v variable speed full speed 5vreg on-duty small on duty large minimum speed setting rotation lim voltage ctl pin eo pin eo voltage soft start the slope changes according to t he capacitance of soft pin. (large large slope) ctl pin stop v cc pin soft pin full speed stop full speed
LB11850VA no.a0609-9/14 3) additional description of operations the lb11850 forms a feedback loop inside the ic so that the fg period (mot or speed) corresponding to the control voltage is established by inputting the duty pulse. the operation inside the ic is as follo ws. pulse signals are created from the ed ges of the fg signals as shown in the figure below, and a waveform with a pulse width which is determined by the cr time constants and which uses these edges as a reference is generated by a one-shot multivibrator. these pulse waveforms are integrated and the duty ratio of the pre-driver output is controlled as a control voltage. furthermore, by changing the pulse width as determined by the cr time constant, the vctl versus speed slope can be changed as shown in the speed control diagram of the previous section. however, since the pulses used are determined by the cr time constant, the variations in cr are output as-is as the speed control error. LB11850VA speed control block fg control signal ctl ctl signal closed feed-back loop pre-driver block fg edge pulse rc pin 1 shot output trc(s) = 1.15rc slope due to cr time constant
LB11850VA no.a0609-10/14 4) procedure for calculating constants the slope shown in the speed control diagram is determined by the constant of the rc pin. (1) obtain fg signal frequency ffg (hz) of the maximum speed of the motor. (with fg2 pulses per rotation) ffg (hz) = 2 rpm/60 .... <1> (2) obtain the time constant which is connected to the rc pin. (have ?duty? (example: 100% = 1.0, 60% = 0.6) serve as the ctl duty ratio at which the maximum speed is to be obtained.) r c = duty/(3.3 1.1 ffg) .... <2> (3) obtain the resistance and capacitance of the capacitor. based on the discharge capacity of the rc pin, the capacitance of the capacitor which can be used is 0.01 to 0.015 f. therefore, find the appropriate resistance usin g equation <3> or <4> below from the result of <2> above. r = (r c)/0.01 f .... <3> r = (r c)/0.015 f .... <4> the temperature characteristics of the curve are determined by the temperatur e characteristics of the capacitor of the rc pin. when temperature-caused fluctuations in the speed are to be minimized, use a capacitor with good temperature characteristics. (rpm) ctl duty(%) motor at maximum speed 0% 100%
LB11850VA no.a0609-11/14 these pins determine the position of th e slope origin. (when the origin point is at (0%, 0 rpm), cvo and cvi are shorted.) (1) movement along the x-axis (resistance divided between cvo and gnd) (example) in the case where the characteris tics change from ones with the origin po int (0%, 0 rpm) to ones where the speed at a duty ratio of 30 % becomes the speed at 0%: first, obtain the input voltage of the cvi pin required at 0%. cvi = 5-(3 duty ratio) = 5-(3 0.3) = 5-0.9 = 4.1v next, obtain the resistances at which the voltage becomes 4.1v by dividing the resistance between cvo and gnd when cvo is 5v. the ratio of cvo-cvi: cvi-gnd is 0.9v: 4.1v = 1: 4.5. based on the above, the resistance is 20k between cvo and cvi and 91k between cvi and gnd. furthermore, the slope changes. (in the case of the example given, since the resistance ratio is 1: 4.5, the slope is now 4.5/5.5 = 0.8 times what it was originally.) if necessary, change the resistance of the rc pin, and adjust the slope. ctl vref cvi soft lim c cvo ctl r4 r5 (rpm) ctl duty(%) motor at maximum speed 0% 100% move in the direction of the x-axis
LB11850VA no.a0609-12/14 (2) movement along the y-axis (resistance divided between cvo and v cc ) (example) in the case where the characteris tics change from ones with the origin po int (0%, 0 rpm) to ones where the speed at a duty ratio of 25% becomes 0 rpm: first, obtain the cvo pin voltage required for the cvi voltage to be 5v at 25%. cvo = 5-(3 duty ratio) = 5-(3 0.25) = 5-0.75 = 4.25v with cvo = 4.25v, find the re sistances at which cvi = 5v. the ratio of cvo-cvi: cvi-gnd is 0.75v: 7v = 1: 9.3 based on the above, the resistance is 20k between cvo and cvi and 180k between cvi and v cc . (due to the current capacity of the cvo pin, the total resistance must be set to 100k or more.) furthermore, the slope changes. (in the case of the example given, since the resistance ratio is 1: 9.3, the slope is now 9.3/10.3 = 0.9 times what it was originally.) if necessary, change the resistance of the rc pin, and adjust the slope. ctl vref cvi soft lim c cvo ctl r4 r5 v cc (rpm) ctl duty(%) motor at maximum speed 0% 100% move in the direction of the y-axis
LB11850VA no.a0609-13/14 the minimum speed is determined by the voltage of the lim pin. (1) obtain the ratio of the minimum speed required to the maximum speed. ra = minimum speed/maximum speed .... <1> in the example shown in the figu re above, ra = minimum speed/max imum speed = 3000/10000 = 0.3. (2) obtain the product of the duty ratio at which the maximum speed is obtained and the value in equation <1>. ca = duty ratio at maximum speed ra .... <2> in this example, ca = duty ratio at maximum speed ra = 0.8 0.3 = 0.24. (3) obtain the required lim pin voltage. lim = 5-(3 ca) .... <3> in this example, lim = 5-(3 ca) = 5-(3 0.24) 4.3v. (4) divide the resistance of 5vreg, and generate the lim voltage. in this example, the voltage is 4.3v so the resistance ratio is 1: 6. the resistance is 10k between 5vreg and lim and 62k between lim and gnd. (rpm) ctl duty(%) maximum speed 0% 5v 100% 2v minimum speed setup cvo pin voltage (v) 2000 4000 6000 8000 10000 5vreg vref cvi soft lim
LB11850VA ps no.a0609-14/14 in order to connect a capacitor capable of smoothing the pin voltage to the c pin, the correlation given in the following equation must be satisfied when f (hz) serves as the input signal frequency of the ctl pin. (r is contained inside the ic, and is 180k (typ.).) 1/f = t < cr the higher the capacitance of the capacitor is, the slower the response to changes in the input signal is. c p in vref circuit 180k ctl circuit ctl pin ctl pin input inverted waveform (same frequency) connect a capacitor capable of smoothing the pin voltage 1/f = t < cr 5vreg 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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