KA9259D 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA9259D

5-Channel Motor Driver

Fairchild Semiconductor 

Application Information

1. MUTE

KA9259D

Pin #7

Mute circuit

High

Turn-off

7

Low

Turn-on

Output driver

bias

• 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 disabled and the output circuit operates normal.

• 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)

VREF BG

R11

Output driver

bias

Q11

R12

• The VREF BG is the output voltage of the band-gap-referenced biasing circuit and acts as the input voltage of the TSD

circuit.

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

VBE = VREF BG × R12 / (R11+R12) = 400mV

• 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.

3. REGULATOR

I

VREF BG

−

+

D1

R1

D2

5

KSB772

6

VOUT

(5V)

R2

+

CE

R3

100µF

8

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