BH6511 データシートの表示（PDF） - ROHM Semiconductor

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BH6511

4-channel PWM driver for CD and MD players

ROHM Semiconductor 

Optical disc ICs

FCircuit operation

(1) PWM driver

The output stage is an H-bridge driver with four N-type

FET circuits. Output PWM duty is changed according to

input PWM duty. This pulse drives the load (direct PWM).

Driver truth table

(2) Charge pump

A dedicated charge pump that supplies the drive voltage

to the output stage H-bridge power MOSFET.

(3) Because the charge pump circuit doubles the volt-

age using pin 9 voltage as its reference, VG is not output

unless VM is impressed on pin 9. Also, be sure to set the

VM voltage to keep the charge pump voltage under the

absolute maximum rating.

(4) When supplying VG directly from an external

source, rather than using the internal charge pump cir-

cuit, disconnect the capacitor between pins 31 and 32.

(5) A charge pump capacitor between 0.01 and 0.1µF

is recommended. Using one with a greater capacity will

not significantly improve performance.

BH6511FS

266

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