FAN8001 Fairchild Semiconductor, FAN8001 Datasheet - Page 7

• Manufacturer Part Number: FAN8001
• Description: 5-Channel Motor Driver
• Manufacturer: Fairchild Semiconductor

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
• 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
2. TSD (THERMAL SHUTDOWN)
• The V
• 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.
circuit will be muted.
muted.
circuit.
V
Hence, the Q11 would turn on so the output circuit will be muted.
BE
= V
REF BG
REF BG
Pin #7
is the output voltage of the band-gap-referenced biasing circuit and acts as the input voltage of the TSD
High
Low
R12 / (R11+R12) = 400mV
Mute circuit
Turn-on
Turn-off
R12
R11
V
REF BG
Q11
7
7
Output driver
bias
Output driver
bias
FAN8001D