TA8069F 데이터 시트보기 (PDF) - Toshiba

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TA8069F

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC

Toshiba 

TA8069F

Multiple protection operation

TA8069F features built-in overvoltage (VSD), overcurrent (ISD), and thermal (TSD) protection functions. These

functions protect TA8069F (sometimes motors, too) from deterioration or destruction due to overpower stress.

The functions are independent from each other.

Functions are described below.

1. Overvoltage protection (VSD)

• Outline

When the voltage supplied to the VCC pin is less than the VSD detection voltage, output is controlled by

input signals. When the VCC voltage is greater than the VSD detection voltage, output becomes high

impedance (off) regardless of input signals.

• Operation

The VSD voltage is detected by comparing the zener voltage with the voltage obtained by dividing VCC by

the resistance. If the center voltage of the resistance is higher than the zener voltage, a transistor-off

instruction is issued to the control logic portion; if lower, the logic portion is controlled by input signals.

2. Thermal protection (TSD)

• Outline

When the junction temperature (chip temperature) is less than the TSD detection temperature, output is

controlled by input signals. When the junction temperature is greater than the detection temperature,

output becomes high impedance regardless of input signals.

• Operation

The temperature is detected by monitoring VF of diodes on the chip. If the diode VF is lower than the

internal reference voltage, a transistor-off instruction is issued to the logic portion; if higher, the logic portion

is controlled by input signals.

4

2002-02-27

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