ROHM BH6505K Datasheet

Optical disc ICs

PWM driver for CD and MD players

BH6505K

The BH6505K is a 4-channel PWM driver designed for CD and MD player motor and actuator drives. The power MOS­FET output stage allows for applications with low power consumption. This IC also has a charge pump circuit and stan­dard operational amplifier (needed for power MOSFET gate drives), and so supports a wide spectrum of applications.

Applications
Portable CD players, MD players

Features

1) Low power consumption.

2) A minimum of attached components.

3) Good gain precision because of the voltage feedback
circuit.

4) Internal mute function for channels 1 and 2.

Absolute maximum ratings (Ta = 25C)

5) Allows for free-running and clock synchronization op­eration.

6) Internal standard operational amplifier.

7) Internal charge pump circuit for gate drive.

Recommended operating conditions

241

Optical disc ICs BH6505K

Block diagram

242

Optical disc ICs BH6505K

Pin descriptions

243

Optical disc ICs BH6505K

Input / output circuits

244