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Rohm Semiconductor Electronic Components Datasheet

BD7905BFS Datasheet

6CH Power Driver for CD-ROM/ DVD-ROM

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BD7905BFS pdf
Optical disc ICs
6CH Power Driver for
CD-ROM, DVD-ROM
BD7905BFS
BD7905BFS
BD7905BFS is a 6-channel driver IC that integrates all drivers necessary for optical disc driver. Low vibration, low noise,
and low heat operation have been realized by adopting 180° PWM driving system for spindle motor driver. The built-in
2-channel sled motor driver is used for the stepping motor.
!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 and gain 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 180deg PWM drive.
Built in current limit, hall bias, short brake, FG 3-phase mixed signal output and reverse protection circuit.
Low ON-Resistor. (RON=0.85)
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


Rohm Semiconductor Electronic Components Datasheet

BD7905BFS Datasheet

6CH Power Driver for CD-ROM/ DVD-ROM

No Preview Available !

BD7905BFS pdf
Optical disc ICs
!Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
POWER MOS
power suuply voltage
SPVM1,2,SLRNF1,2
Preblock/BTL powerblock
power supply voltage
VCC,SLVDD,AVM
PWM control block
power supply voltage
DVCC
Power dissipation
Pd
Operating temperature range
Topr
Storage temperature
Tstg
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.
Limits
151
15
7
2.62
40~+85
55~+150
Unit
V
V
V
W
°C
°C
BD7905BFS
!Recommended operating conditions (Ta=25°C)
(Set the power supply voltage taking allowable dissipation into considering)
Parameter
Symbol
Min.
POWER MOS Power supply voltage 1
SPVM1, 2
POWER MOS Power supply voltage 2
SLRNF1, 2
Preblock Power supply voltage
SLVDD, VCC
AVM
Power block Power supply voltage
AVM
4.3
PWM control block Power supply voltage
DVCC
4.3
Spindle output current
Iosp
SL/FO/TR/LO output current
Ioo
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.
Typ.
VCC3
SLVDD3
12
5.0
5.0
1.2
0.5
Max.
14
VCC
6.0
2.54
0.8
Unit
V
V
V
V
V
A
A
2/17


Part Number BD7905BFS
Description 6CH Power Driver for CD-ROM/ DVD-ROM
Maker Rohm
Total Page 18 Pages
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BD7905BFS pdf
BD7905BFS Datasheet PDF
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