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?2003 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.1 features common ? built-in thermal shutdown circuit (tsd) built-in power save circuit 4 independent voltage sources corresponds to 3.3v or 5v dsp spindle output pwm mode control btl(sled 2-channels) output pwm mode control btl(other 3-channels) output linear mode control description the FAN8732G/bg/cg is a monolithic ic suitable for a pwm 3-phase bldc spindle motor driver, 2-ch pwm motor drivers for sled motor and 3-ch linear drivers which drive the focus actuator, tracking actuator and loading motor of the optical media applications. 42-ssop-ep typical applications compact disk rom (cd-rom) compact disk rw (cd-rw) digital video disk rom (dvd-rom) digital video disk ram (dvd-ram) digital video disk player (dvdp) other compact disk media ordering information x:tape & reel type FAN8732G:fg1x fan8732bg:fg3x fan8732cg:fg3x,pull down resistor at sb pin device package operating temp. FAN8732G 42-ssop-ep ? 20 c ~ +75 c FAN8732Gx 42-ssop-ep ? 20 c ~ +75 c fan8732bg 42-ssop-ep ? 20 c ~ +75 c fan8732bgx 42-ssop-ep ? 20 c ~ +75 c fan8732cg 42-ssop-ep ? 20 c ~ +75 c fan8732cgx 42-ssop-ep ? 20 c ~ +75 c FAN8732G/fan8732bg/fan8732cg spindle motor and 5-ch actuator driver [spindle(pwm), sled 2-ch(pwm) 3-ch(linear)]
FAN8732G/fan8732bg/fan8732cg 2 pin assignments 1 2 3 4 5 6 7 8 9 33 32 31 36 35 34 39 38 37 42 41 40 FAN8732G/ in4 in5 pvcc3 cs2 do5+ do5- pgnd3 cs1 do4+ do4- pgnd2 w 10 11 12 osc mute in3 pvcc1 sb do3- do3+ do1- do1+ pgnd1 do2+ do2- 15 16 17 v u cs3 hw- hw+ hv- hv+ hu- 18 19 20 hu+ 26 25 24 29 28 27 svcc sgnd in2 in1 spin vref fg vh pvcc2 21 14 13 22 23 30 fan8732bg/ fan8732cg
FAN8732G/fan8732bg/fan8732cg 3 pin definitions pin number pin name i/o pin function description 1 in4 i ch4 input (typically sled1 input) 2 in5 i ch5 input (typically sled2 input) 3 pvcc3 - power supply for ch4 and ch5 4 cs2 - current sense for ch5 5 do5 + o ch5 + drive output (typically sled2 output +) 6 do5 - o ch5 - drive output (typically sled2 output -) 7 pgnd3 - power ground 3 8 cs1 - current sense for ch4 9 do4 + o ch4 + drive output (typically sled1 output +) 10 do4 - o ch4 - drive output (typically sled1 output -) 11 pgnd2 - power ground 2 12 w o 3-phase output w for spindle 13 v o 3-phase output v for spindle 14 u o 3-phase output u for spindle 15 cs3 - current sense for spindle driver 16 hw - i hall w(-) input 17 hw + i hall w(+) input 18 hv - i hall v(-) input 19 hv + i hall v(+) input 20 hu - i hall u(-) input 21 hu + i hall u(+) input 22 pvcc2 - power supply for spindle driver 23 vh i hall bias 24 fg o frequency generator (FAN8732G:fg1x, fan8732bg:fg3x) 25 vref i reference voltage input 26 spin i spindle torque control 27 in1 i channel 1 input (typically focus input) 28 in2 i channel 2 input (typically tracking input) 29 sgnd - signal ground 30 do2 - o ch2 - drive output (typically tracking output +) 31 do2 + o ch2 + drive output (typically tracking output -) 32 svcc - power supply for signal block and ch1, ch2 33 pgnd1 - power ground 1
FAN8732G/fan8732bg/fan8732cg 4 pin definitions (continued) pin number pin name i/o pin function description 34 do1 + o ch1 + drive output ((typically focus output +) 35 do1 - o ch1 - drive output (typically focus output -) 36 do3 + o ch3 + drive output (typically loading output +) 37 do3 - o ch3 - drive output (typically loading output -) 38 sb i short brake mode selection 39 pvcc1 - power supply for ch3 40 in3 i channel 3 input (typically loading input) 41 mute i all channel mute 42 osc i pwm carrier frequency set
FAN8732G/fan8732bg/fan8732cg 5 internal block diagram pvcc2 pgnd1 pvcc1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 in4 in5 pvcc3 do5+ do5- pgnd3 cs1 do4+ do4- v u cs3 hw- hw+ hv- hv+ hu- hu+ cs2 pgnd2 w 42 41 40 39 38 37 36 35 34 33 32 31 30 28 27 26 25 24 23 22 29 vh fg vref spin in1 in2 sgnd svcc do2- do2+ do1+ do1- do3+ do3- sb in3 mute osc 6 6 6 6 4 4 bootstrap regulator hall bias tsd lpf h bridge pwm control lpf osc osc osc osc focus, tracking, loading block spindle power pvcc3 spindle power h bridge oscillator hall amp all mute short brake mode in3 pwm control commutator & power driver lpf reverse detector frequency generator pwm control i omax r s q drive logic gm - + + - - +
FAN8732G/fan8732bg/fan8732cg 6 equivalent circuits sled & spindle input actuator & loading input hall input current sense input hall bias input fg output vref input drive output 2k ? 1 2 26 svcc 2k ? 27 28 40 svcc 2k ? svcc 16 17 18 19 20 21 4 8 15 23 svcc 24 svcc 2k ? 25 svcc 2k ? 2k ? 5 6 12 14 30 31 34 35 36 37
FAN8732G/fan8732bg/fan8732cg 7 equivalent circuits (continued) mute/sb input(FAN8732G/bg) oscillation input sb input(fan8732cg) 8k ? 41 30k ? 12k ? 38 2k ? 42 svcc 2k ? 2k ? 8k ? 30k ? 12k ? 38 10k ?
FAN8732G/fan8732bg/fan8732cg 8 absolute maximum ratings (ta = 25 c) note: 1. case 1: single layer pcb with 1 signal plane only. pcb size is 76mm 114mm 1.6mm. 2. case 2: multi layer pcb with 1 signal, 1 power and 1 ground planes. pcb size is 76mm 114mm 1.6mm. cu planes size for power and ground is 74mm 62mm 0.035mm. 3. these are experimental datum. 4. power dissipation reduce rate of the case 1: -15.2mw/ c(ta 25 c) 5. power dissipation reduce rate of the case 2: -26.4mw/ c(ta 25 c) 6. should not exceed p d and soa (safe operating area) power dissipation curve parameter symbol value unit supply voltage (signal block & ch1,2) sv ccmax 7v supply voltage (power for ch3) pv cc1max 15 v supply voltage (spindle driver) pv cc2max 15 v supply voltage (power for ch4 & 5) pv cc3max 15 v power dissipation p d 1.9 / 3.3 note w operating temperature range t opr -20 ~ +75 c storage temperature range t stg -40 ~ +150 c maximum output current (spindle) i omax1 1.5 a maximum output current (focus, tracking, loading) i omax2 1.0 a maximum output current (sled) i omax3 0.5 a case 1 case 2 remark pd is measured base on the je- dec/std(jesd 51-2) pd=1.9w pd=3.3w pcb(glass-epoxy) power plane(cu) gnd plane(cu) 175 150 125 100 50 25 0 1,000 2,000 3,000 pd [mw] ambient temperature, ta [ c] 0 75 case2 case1 soa
FAN8732G/fan8732bg/fan8732cg 9 recommended operating conditions (ta = 25 c) parameter symbol min. typ. max. unit operating supply voltage (signal block & ch1,2) sv cc 4.5 5 7 v operating supply voltage (power for ch3) pv cc1 4.5 12 13.2 v operating supply voltage (spindle driver) pv cc2 6 12 13.2 v operating supply voltage (power for ch4,5) pv cc3 4.5 12 13.2 v output current(spindle) i o1 -0.51.0a output current(focus, tracking, loading) i o2 -0.50.8a output current(sled) i o3 -0.250.4 a pwm carrier frequency f osc 30 - 120 khz
FAN8732G/fan8732bg/fan8732cg 10 electrical characteristics (ta = 25 c) (ta=25 c, sv cc =pv cc1 =5v, pv cc2 =pv cc3 =12v unless otherwise noted) parameter symbol condition min. typ. max. unit common part quiescent circuit current i cc ?? 50 70 ma mute on current i mute mute=0v ? 030 a mute on voltage v mon mute=variation ?? 0.8 v mute off voltage v moff mute=variation 2.5 ?? v mute input current i mutein mute=5v ?? 500 a pwm carrier frequency f osc c osc =330pf ? 65 ? khz ref input voltage range v refin ? 1.0 ? 3.3 v ref input current range i refin v ref =1.65v -10 ? +10 v sb low voltage v sbl sb=variation ?? 0.8 v sb high voltage v sbh sb=variation 2.5 ?? v sb input current1 i sb1 sb=5v(FAN8732G/bg) ?? 500 a sb input current2 i sb2 sb=5v(fan8732cg) ?? 1.2 ma spindle drive part maximum output voltage1 v om1 i o =0.5a 10.6 11.1 ? v control voltage deadzone11 v dead11 spinvref 0 40 80 ma control voltage input range1 v in1 ? 0 ? 5v voltage gain1 g vo1 g io1 =g vo1 /rcs[a/v] 0.85 1.0 1.15 v/v control voltage limit 1f v limit1f i limit1f =v limit1f /rcs[a] 0.4 0.5 0.6 v control voltage limit 1r v limit1r i limit1r =v limit1r /rcs[a] 0.22 0.28 0.34 v hall amp common mode input range vh com ? 1.3 ? 3.7 v hall bias output voltage v vh i vh =10ma 0.6 0.85 1.2 v vh pin sink current i vh mute-5v ?? 30 ma ch4/ch5 drive part (typically sled driver) maximum output voltage21 v om21 io=0.5a, pv cc3 =5v 3.4 3.8 ? v maximum output voltage22 v om22 io=0.5a, pv cc3 =12v 10.3 10.8 ? v control voltage deadzone21 v dead21 in4,5vref 0 40 80 mv control voltage input range2 v in2 ? 0 ? 5v voltage gain2 g vo2 g io2 =g vo2 /rcs[a/v] 0.85 1.0 1.15 v/v control voltage limit 2 v limit2 i limit2 =v limit2 /rcs[a] 0.43 0.5 0.58 v output leak current i leak mute=5v -100 ? 100 a
FAN8732G/fan8732bg/fan8732cg 11 electrical characteristics (ta = 25 c) (continued) (ta=25 c, sv cc =pv cc1 =5v, pv cc2 =pv cc3 =12v unless otherwise noted) parameter symbol condition min. typ. max. unit ch1,ch2 drive part (typically actuator driver) maximum output voltage 31 v om31 i o =0.5a, pv cc2 =12v 3.8 4.2 ? v control voltage input range3 v in3 ? 0 ? 5v closed loop voltage gain g vo3 ? 20.2 21.6 22.8 db output offset voltage v oo1 vref=in1=in2=1.65v -45 ? 45 mv ch3 drive part (typically loading driver) maximum output voltage 41 v om41 i o =0.5a, pv cc1 =5v, pv cc2 =12v 3.95 4.2 ? v maximum output voltage 42 v om42 i o =0.5a, pv cc1 =pv cc2 =12v 6.2 6.7 ? v control voltage input range4 v in4 ? 0 ? 5v closed loop voltage gain g vo4 ? 16.7 18.1 19.3 db output offset voltage v oo2 vref=in3=1.65v -50 ? 50 mv
FAN8732G/fan8732bg/fan8732cg 12 application information 1. torque control & output current control of 3-phase bldc motor 1) by amplifying the voltage difference between v ref and spin from servo ic(or dsp), the torque amp produces the input voltage(v amp ) which is input current command. 2) the output current (i o ) is converted into the voltage (v cs ) through the sense resistor (r cs ) and compared with the v amp . 3) the clock generator has the rs latch set periodically, this makes output driver on state and when the v cs and the v amp is equal the state becomes off. 4) by the negative feedback loop, the sensed output voltage v cs equals to the v amp . 5) commutating sequence is selected by hall sensor inputs, and the minimum hall input voltage is 60mv. 6) the gain and limit current are calculated as below table.(gvo=1[v/v]) 7) the range of the input voltage is as shown below when rcs=0.5 ?, r ext1 =0 and r ext2 =inf. forward limit current reverse limit current input/output gain[a/v] remark is gain scaler + - torque amp v ref spin commutator driver m rcs vcs + - io v amp + - lpf r s q clock generator hall sensor r ext1 r ext2 pvcc2 inside ic i omax 6 0.5 rcs ---------- - 0.28 rcs ----------- r ext2 r ext1 r ext2 + ----------------------------------------------- - g vo r cs ------------- - ? r ext2 r ext1 r ext2 + ----------------------------------------------- - forward dead dead reverse current [a] 0 spin-v ref the input range of spin is 0 v ~ 5 v 1 40mv -40mv zone+ zone- 0.56 g io =g vo / r cs rotation sb=h spin > v ref forward rotation spin < v ref reverse brake sb=l, open ? short brake
FAN8732G/fan8732bg/fan8732cg 13 2. torque control & output current control of sled motor(2-phase step motor) 1) by amplifying the voltage difference between v ref and in4(or in5) from servo ic(or dsp), the torque amp produces the input voltage(v amp ) which is input current command. 2) the output current (i o ) is converted into the voltage (v cs ) through the sense resistor (r cs ) and compared with the v amp . 3) the clock generator has the rs latch set periodically, this makes output driver on state and when the v cs and the v amp is equal the state becomes off. 4) by the negative feedback loop, the sensed output voltage v cs equals to the v amp . 5) to avoid output upper and lower transistor?s short through, switch trick is needed. turn on delay time is 1usec, turn off delay time is 2usec and the phase delay time, when the current direction is changed, is 3usec. 6) the gain and limit current are calculated as below table.(gvo=1[v/v]) 8) the range of the torque voltage is as shown below when rcs=0.5 ?, r ext1 =0 and r ext2 =inf. torque limit current input/output gain[a/v] remark is gain scaler + - torque amp v ref in4(or in5) driver m rcs vcs + - io pvcc3 v amp + - lpf r s q clock generator r ext1 r ext2 drive logic inside ic i omax 4 0.5 rcs ---------- - r ext2 r ext1 r ext2 + ----------------------------------------------- - g vo r cs ------------- - ? r ext2 r ext1 r ext2 + ----------------------------------------------- - forward dead dead reverse current [a] 0 in4/in5-v ref i limit 40mv -40mv zone+ zone- g io =g vo / r cs
FAN8732G/fan8732bg/fan8732cg 14 3. ch1/ch2/ch3 drive part 1) the reference voltage, v ref, is given externally through pin 25. 2) the power amp circuit produces the differential output voltages and drives the two output power amplifier circuits. 3) the ch1/ch2 gain of do- drive part of the power amp block is 6r/r=6 times(and the gain of ch3 is 4r/r=4times). the do+ drive part of the power amp block is just inverting circuit of do- drive part so the total gain of power amp block is 12 times that is 21.58db(in case of ch3, gain is 8 times that is 18.06db). 4) power reference voltage, which is the mid-point of the drive output, is set to the half of the supply voltage. 5) when the total gain is too high, the external resistors(r ext1 & r ext2 )can be used to make the gain proper. power amp gain input/output gain[v/v] remark 12(21.58db) is gain scaler + ? + ? m 25 27 28 vref power amp + ? r r svcc do ? 35 30 34 31 do + 30 r r r 6r r 6r in1 in2 r ext1 r ext2 m inside ic (4r) (4r) 36 37 40 in3 power reference r ext2 r ext1 r ext2 + ----------------------------------------------- - 12 ? r ext2 r ext1 r ext2 + ----------------------------------------------- -
FAN8732G/fan8732bg/fan8732cg 15 4. power save & channel selection mute/sb logic tables are as below. 5. sb(short brake mode selection) when sb pin enabled(low), the brake mechanism of 3-phase spindle driver is changed to short brake. when short brake is enabled all lower output transistors are turned on and all upper output transistors are turned off, so the cur- rent due to the motor back emf(electro motive force) is freewheeled through lower transistors and lower freewheeling diodes. it is general that the short brake is safer than the reverse brake in high speed applications. but it is not true in all cases because the current in the short brake is depend on the amount of the motor back emf. so in high speed applications we suggest an optimal brake which is our patent. please contact sales persons or offices if you need more information about the optimal brake. 6. tsd(thermal shut down) when the chip temperature rises up to about 160 o c(degree), all output drivers are shut down. when the chip temperature falls off to about 130 o c, then the drivers recover normal operation. tsd has the temperature hysteresis of about 30 o c. logic input drive change mute(pin41) sb(pin38) ch1 ch2 ch3 ch4 ch5 spindle l l off off off off off off l h off off on off off off hl on on off on on on hh 38 vcc off on 20k ? 1k ? motor off on 12 13 14 short brake operating scheme
FAN8732G/fan8732bg/fan8732cg 16 7. fg output FAN8732G generates fg1x, meanwhile fan8732bg/cg generates fg3x 8. pwm carrier frequency pwm carrier frequency is made from charging and discharging a capacitor which should be connected to osc(#42) pin. you can get typical pwm carrier frequency from below table. 9. hall sensor connection capacitor[pf] 820 680 330 220 180 150 120 carrier frequency[khz] 28 32 65 90 110 143 179 23 vcc vh hall 1 hall 2 hall 3 23 vh vcc hall 1 hall 2 hall 3
FAN8732G/fan8732bg/fan8732cg 17 10. spindle part input-output timing chart the waveforms are different in accordance with motor types. a2 output voltage h1 + h2 + h3 + a1 output current (h1 -)+(h2 +) a3 output current (h3 -)+(h1 +) a3 output voltage a2 output current (h2 -)+(h3 +) a1 output voltage
FAN8732G/fan8732bg/fan8732cg 18 typical application circuits w pgnd2 do4+ do4- cs1 do5+ cs2 pvcc3 in4 in5 do5- pgnd3 FAN8732G/fan8732bg/ fan8732cg tracking actuator focus actuator hall-w hall-v hall-u 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 33 31 30 32 29 28 27 26 25 24 23 22 42 41 40 39 38 37 36 35 34 hu- hw+ hw- cs3 v u hv- hv+ hu+ do2- do2+ do1+ pgnd1 do1- sb pvcc1 in3 osc mute do3- do3+ vh spin in1 in2 svcc sgnd vref fg pvcc2 sled (stepping) motor m m loading motor svcc focus spindle vref (typically 1.65v) 3phase bldc motor tracking short brkae selection pvcc2 pvcc1 mute selection loading vref sled1 vref sled2 vref pvcc3
FAN8732G/fan8732bg/fan8732cg 19
FAN8732G/fan8732bg/fan8732cg 8/18/03 0.0m 001 stock#dsxxxxxxxx ? 2003 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others.

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