FAN8001D

7

Application Information

1. MUTE

• When the mute pin #7 is open or the voltage of the mute pin #7 is below 0.5V, the mute circuit is activated so that the output

circuit will be muted.

• When the voltage of the mute pin is above 2V, the mute circuit is stopped and the output circuit is operated normally.

• If the chip temperature rises above 175

°C, then the TSD (Thermal shutdown) circuit is activated and the output circuit is

muted.

2. TSD (THERMAL SHUTDOWN)

circuit.

• The base-emitter voltage of the TR, Q11 is designed to turn-on at below voltage.

• When the chip temperature rises up to 175

°C, then the turn-on voltage of the Q11 would drop down to 400mV.

Hence, the Q11 would turn on so the output circuit will be muted.

Pin #7

Mute circuit

High

Turn-off

Low

Turn-on

7

Output driver

bias

R11

R12

Q11

Output driver

bias