Maker : Rohm
Part No. : BD7902CFS

Datasheet PDF : BD7902CFS.pdf
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Product Information

BD7902CFS Optical disc ICs 6CH Power Driver for CD-ROM, DVD-ROM BD7902CFS BD7902CFS is a 6-channel driver IC that integrates all drivers necessary for CD-ROM, and DVD-ROM systems into a single chip. The built-in 2-channel sled motor driver is used for the stepping motor. Low heat operation can be achieved by applying the PWM driving system for sled and spindle motor drivers. !Applications CD-ROM, DVD-ROM !Features 1) 3channel BTL driver, 2channel PWM driver and 3phase motor driver. - ALL of the motor and actuator for CD-ROM, DVD-ROM etc. 2) These mode is able to be selected by the two control terminals. - ON/OFF of loading, and other 5channels, brake mode select of spindle driver and standby mode. 3) Built-in triangular-wave generator. 4) Package SSOP-A54 has large power dissipation. 5) Built in thermal-shut-down circuit. 〈 Spindle driver 〉 • Efficient drive by current feedback PWM drive. • Built in current limit, hall bias, short brake, FG output and reverse protection circuit. • Low ON-Resistor. (RON=0.95Ω) 〈 Sled motor driver 〉 • Efficient drive by current feedback PWM drive. • Built in 2channel for stepping motor. 〈 Actuator driver, Loading driver 〉 • Linear BTL drive system. 1/17 BD7902CFS Optical disc ICs !Absolute maximum ratings (Ta=25°C) Parameter POWER MOS power suuply voltage Preblock/BTL powerblock power supply voltage PWM control block power supply voltage Power dissipation Operating temperature range Storage temperature Symbol SPVM1,2,SLRNF1,2 VCC,SLVDD,AVM DVCC Pd Topr Tstg Limits 15∗1 15 7 2.6∗2 −35~+85 −55~+150 Unit V V V W °C °C ∗1 POWER MOS output terminals (9, 11, 18, 34~37pin) is contained. ∗2 PCB (70mm×70mm×1.6mm glass epoxy) mounting. Reduced by 20.8mW for each increase in Ta of 1°C over 25°C. !Recommended operating conditions (Ta=25°C) (Set the power supply voltage taking allowable dissipation into considering) Parameter POWER MOS Power supply voltage 1 POWER MOS Power supply voltage 2 Preblock Power supply voltage Power block Power supply voltage PWM control block Power supply voltage Spindle output current SL/FO/TR/LO output current Symbol SPVM1, 2 SLRNF1, 2 SLVDD, VCC AVM DVCC Iosp Ioo Min. − − AVM 4.3 4.3 − − Typ. VCC∗3 SLVDD∗3 12 5.0 5.0 1.2 0.5 Max. − − 14 VCC 6.0 2.5∗4 0.8 Unit V V V V V A A ∗3 Set the same supply voltage to VCC and SPVM1, 2 to SLVDD and SLRNF1, 2. ∗4 The current is guaranteed 3.0A in case of the current is turned on/off in a duty-ratio of less than 1/10 with a maximum on-time of 5msec. 2/17 BD7902CFS Optical disc ICs !Block diagram SLRNF2 SLRNF1 SLGND SLVDD SLO1+ SLO1− SLO2+ SLO2− AGND SLIN2 FCIN TKIN 54 53 52 51 VCC 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 47k 29 28 47k LEVEL SHIFT − − SLIN1 + FCO+ FCO− LDO+ LDO− TKO+ TKO− DVCC GND GND GND GND GND AVM 47k − + LEVEL SHIFT LEVEL SHIFT PRE LOGIC PRE LOGIC FF LIMIT 47k 94k 94k − TSD FF 47k FG REVERSE DETECT HALL BIAS 1 HU+ 2 HU− 3 HV+ 4 HV− 5 HW+ 6 HW− 7 HB PGND1 SPVM1 V GND GND GND GND GND PGND2 SPVM2 FG SPIN DGND SPRNF CTL1 CTL2 LDIN VC U W + + 47k OSC LIMIT Current COMP FF PWM OUT 3-phase MATRIX OSC Polarity COMP Current LIMIT 94k 15k − − + + 47k FG STBY/ BRAKE CONTROL 15k 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 3/17 BD7902CFS Optical disc ICs !Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Pin name HU+ HU− HV+ HV− HW+ HW− HB PGND1 U SPVM1 V GND GND GND GND GND PGND2 W SPVM2 SPRNF FG CTL1 CTL2 SPIN DGND LDIN VC Function Hall amp. U positive input Hall amp. U negative input Hall amp. V positive input Hall amp. V negative input Hall amp. W positive input Hall amp. W negative input Hall bias Spindle driver power ground 1 Spindle driver output U Spindle driver power supply 1 Spindle driver output V GND GND G...

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