BD7903FS Datasheet, PDF (1/16 Pages) Rohm – 5CH Power Driver for CD-ROM, DVD-ROM

Optical disc ICs
5CH Power Driver for
CD-ROM, DVD-ROM
BD7903FS
BD7903FS
BD7903FS is a 5-channel driver IC that integrates all drivers necessary for CD-ROM, and DVD-ROM systems into a
single chip. Low noise, and low vibration can be achieved by applying the 180° PWM driving system for spindle motor
drivers. Current lag phase occurred by the load of the inductance can be reduced by using the current feedback linear
BTL system to driver the actuator.
!Applications
CD-ROM, DVD-ROM
!Features
1) 4channel BTL 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 4channels, brake mode 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 3-phase mixed signal output and reverse protection circuit.
• Low ON-Resistor. (RON=0.85Ω)
〈 Sled motor driver, Loading driver 〉
• Voltage feedback Linear BTL drive system.
〈 Actuator driver 〉
• Current feedback Linear BTL drive system.
• Current phase lag influenced load inductance is little, because this type is current feedback.
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