KA9259HDTF 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA9259HDTF

5-Channel Motor Drive IC

Fairchild Semiconductor 

KA9259D(KA9259HD)

Application Information

1. Mute Function

Pin #7

High

Low

Open

Mute circuit

Mute-off

Mute-on

Mute-on

VCC

4-Channels BTL driver

Bias Circuit Block

7

• When the mute (pin 7) is high level, the bias circuit of BTL driver is activated. On the other hand, when the mute (pin7) is

open or low level, the bias circuit of BTL driver is disabled. So that the 4-channels BTL driver output circuit will be muted.

2. TSD (Thermal Shutdown) Function

VREFBG

R11

R12

4-Channels BTL driver

& Loading motor driver

Bias Circuit Block

Q11

• The VREFBG 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 transistor, Q11 is designed to turn-on at below voltage.

VBE

=

VREFBG × R12

R11+ R12

=

400[mV ]

• If the chip temperature rises above 175°C, then the TSD circuit is activated and the output circuit is muted. The TSD circuit

has the hysteresis temperature of 25°C.

3. Voltage Regulator

VREFBG

2.5V

KA9259D

21

5

6

R2

R3

VCC

PNP

Vout

C1

8

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