ka3012d-02tf Fairchild Semiconductor, ka3012d-02tf Datasheet - Page 8

• Manufacturer Part Number: ka3012d-02tf
• Description: 4-channel Motor Driver
• Manufacturer: Fairchild Semiconductor

Application Information
1. MUTE
• When the voltage level of the mute pin is above 2V, the mute circuit is activated so that the output circuit will be
• When the mute pin #9 is open or the voltage of the mute pin #9 is below 0.5V, the mute circuit is deactivated and the output
• When the mute circuit is activated, the voltage level of output pins becomes 1/2V
2. TSD (THERMAL SHUTDOWN)
• If the chip temperature rises above 175 C, then the TSD (Thermal shutdown) circuit is activated and the output circuit is
• The V
• The base-emitter voltage of the TR,Q11 is designed to turn-on at 460mA.
• When the chip temperature rises up to 175 C, the turn-on voltage of the Q11 drops down to 460mV. (Hysteresis: 25 C) and
muted.
circuit operates normally.
muted.
circuit.
V
Q11 turns on so the output circuit is muted.
BE
= V
REF BG
REF BG
Pin #9
Open
High
Low
is the output voltage of the band-gap-referenced bias in circuit and acts as the input voltage of the TSD
R12 / (R11 + R12)=460mV
Mute circuit
Turn-on
Turn-off
Turn-off
R12
R11
V
REF BG
Q11
8
9
Output driver
bias
CC
(approximately).
Output driver
bias
KA3012D