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| BH6518FS Optical disc ICs 4-channel PWM driver for CD and MD players BH6518FS The BH6518FS is a 4-channel PWM driver for CD and MD player motors and actuators. The power MOSFET in the output stage assures low power consumption for applications. !Applications CD and MD players !Features 1) Internal 4-ch power MOS H-bridge. 2) Adaptable for PWM input. 3) Built-in charge-pump circuit for step-up. 4) Low ON resistance : 1.2 (Typ.). 5) Thermal shutdown circuit. 6) Low power consumption. 7) 32pin SSOP-A package. Compact package. !Absolute maximum ratings (Ta=25C) Parameter H-bridge supply voltage Control circuit supply voltage Predriver supply voltage Driver output current Power dissipation Operating temperature Storage temperature Symbol VM VDD VG (2pin) IO Pd Topr Tstg Limits 9 9 12 1000 850 -40~+85 -55~+150 Unit V V V mA mW C C PCB(70mmx70mmx1.6mm glass epoxy) mounting. Reduced by 6.8mW for each increase in Ta of 1C over 25C. !Recommended operating conditions (Ta=25C) Parameter H-bridge supply voltage Control circuit supply voltage Predriver supply voltage Pulse input frequency Symbol VM VDD VG (2pin) fIN Min. 1.6 2.7 VM+3.0 - Typ. 5.0 3.0 10 176.4 Max. 5.5 5.5 11.5 200 Unit V V V kHz When the internal charge pump is not used. When it is used : 2.7~5.5V. 1/7 BH6518FS Optical disc ICs !Block diagram 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 INTERFACE INTERFACE VDD CHARGE PUMP & OSC PREDRIVE PREDRIVE TSD PREDRIVE PREDRIVE VG PSB INTERFACE INTERFACE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 !Pin descriptions Pin No. Pin name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 GND VG IN4R IN4F VM4 OUT4F PGND4 OUT4R VM34 OUT3R PGND3 OUT3F VM3 IN3F IN3R PSB Functions Predrive ground Gate voltage supply CH4 reverse input CH4 forward input Power supply CH4 forward output Power ground CH4 reverse output Power supply CH3 reverse output Power ground CH3 forward output Power ground CH3 forward input CH3 reverse input Power cut Pin No. Pin name 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 VDD IN1R IN1F VM1 OUT1F PGND1 OUT1R VM12 OUT2R PGND2 OUT2F VM2 IN2F IN2R CAPA+ CAPA- Functions Predrive power supply CH1 reverse input CH1 forward input Power supply CH1 forward output Power ground CH1 reverse output Power supply CH2 reverse output Power ground CH2 forward output Power supply CH2 forward input CH2 reverse input Charge pump capacitor connect terminal + Charge pump capacitor connect terminal - 2/7 BH6518FS Optical disc ICs !Input / Output terminal equivalent circuit VDD 17 37.5 10k VM4 5 OUT4F 6 8 OUT4R 1 GND 7 PGND4 VM34 9 3, 4, 14, 15, 16, 18, 19, 29, 30 VDD 17 37.5 10k VM34 9 OUT3R 10 50k VM3 13 16 12 OUT3F 1 50k GND 11 PGND3 VM1 20 VM12 24 OUT1F 21 23 OUT1R VM34 9 CAPA+ 31 32 CAPA- 22 PGND1 2 VG VM12 24 OUT2R 25 27 OUT2F VM2 28 37.5 1 GND 26 PGND2 Fig.1 3/7 BH6518FS Optical disc ICs !Electrical characteristics (unless otherwise noted, Ta=25C, VM=5V, VDD=3V, VG=step up output, fIN=176kHz, RL=8-47H,) Parameter H-bridge supply current No input Control supply current No input Operating PSB IDD1 IDD2 IDD3 - - - 8.8 7.9 100 110 - 9.95 8.5 - - - - 1.2 0.2 0.2 - 370 210 220 1 A A A V V Fig.2 IMST - 320 380 A Symbol Min. Typ. Max. Unit Conditions Measurement circuit Fig.2 VDD=3V, VM=5V IDD1+4CH driven simultaneously Fig.2 Fig.2 Predrive supply voltage (charge-pump output) No input Operating Logic input characteristics Input high level voltage Input low level voltage Input high level current Input low level current Output ON resistance VIH VIL IIH IIL RON tRISE tFALL tMIN fOSC VDD-0.6 - - -1 - - - 220 150 - 0.6 1 - 2.0 1 1 - 520 V V A A us us ns kHz Fig.2 Fig.2 Fig.2 Fig.2 VGST VGA 12 11 Fig.2 4CH driven simultaneously Fig.2 Sum of top and bottom ON resistance VM=2.5V, VDD=3V, VG=10V (VG is external supply) Fig.2 Fig.2 Fig.2 Output delay time Minimum output pulse width Oscillation frequency Not designed for radiation resistance. Output pluse width 2/3 tMIN 31pin wave monitor Fig.2 Fig.2 4/7 BH6518FS Optical disc ICs !Measurement circuit H L H L H L H L SWC is ON, when the built-in Step-up circuit. 0.01F A A 8 47H 8 47H A A IDD A A IST V SWC V 25 24 23 22 21 20 19 18 17 VM=2.5V 32 31 30 29 28 27 26 VDD=3V INTERFACE INTERFACE VDD CHARGE PUMP & OSC PREDRIVE PREDRIVE TSD PREDRIVE PREDRIVE VG PSB INTERFACE INTERFACE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0.01F SWC IG VG=10V L H H L V A A A 8 47H 8 V A 47H A A L H H L H L VIH DC IN DC IN PULSE IN PULSE IN VIL Fig.2 5/7 BH6518FS Optical disc ICs !Application circuit TRACKING (-) TRACKING (+) FOCUS (+) FOCUS (-) SLED (-) SLED (+) SPDL (+) SPDL (-) DSP TRACKING COIL IN2R IN2F FOCUS COIL IN1R IN1F 0.01F 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 INTERFACE INTERFACE VDD CHARGE PUMP & OSC PREDRIVE PREDRIVE TSD PREDRIVE PREDRIVE VG PSB INTERFACE INTERFACE 1 0.01F 2 3 4 5 6 7 8 9 10 11 12 13 14 IN3F 15 IN3R 16 -COM Fig.3 MUTE IN4R IN4F M SPINDLE MOTOR M SLED MOTOR VM=5V 6/7 BH6518FS Optical disc ICs !Operation notes (1) VG voltage is double of 9pin voltage. Therefore, if without voltage supply on 9pin, Charge pump do not generate VG. And adjust VM, not to over absolute maximum rating of VG. (2) In case of supply VG by external power supply, please remove capacitor between 31 to 32pin. (3) Recommendable charge pump capacitance is 0.010.1F. Much more capacitance may not be effective. (4) A thermal shutdown circuit (over temperature protection circuit) is built in to prevent the IC from thermal breakdown. Use the IC under the allowable thermal loss of the package (0.85W). In case the IC is left running exceeding the allowable loss, the junction temperature rises, and the thermal shutdown circuit works at the junction temperature of 175C (Typ.) (the output of all the channels are brought to open status). When the junction temperature drops to 150C (Typ.), the IC start operating again. !External characteristic curves 5.0 VDD=3V 4.0 VM=5V 176kHz VIN=0/3V, OUTPUT VOLTAGE : VO (V) 0.4 RL=+47H VDD=3V VM=5V 0.3 VIN=0/3V, 176kHz OUTPUT VOLTAGE : VO (V) RL=200+47H 15 14 13 12 No load, no input 3.0 2.0 RL=8+47H 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.2 -0.1 VG : Built-in charge pump Input and Output are smoothed through LPF. 0 0.1 0.2 VG (V) RL=8+47H 1.0 0 -1.0 -2.0 -3.0 -4.0 -5.0 -3.0 -2.0 VG : Built-in charge pump Input and Output are smoothed through LPF. 3.0 0 1.0 2.0 -1.0 11 10 9 8 7 6 5 3 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE : VIN (V) INPUT VOLTAGE : VIN (V) SUPPLY VOLTAGE : VDD=VM (V) Fig.4 I/O characteristics Fig.5 I/O characteristics during ultralow input Fig.6 Supply voltage vs. charge-pump output !External dimensions (Units : mm) 13.60.2 32 17 7.80.3 5.40.2 1.80.1 1 16 0.150.1 0.1 0.11 0.8 0.360.1 SSOP-A32 0.3Min. 7/7 |
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