TA8051 Ver la hoja de datos (PDF) - Toshiba

Número de pieza

componentes Descripción

Fabricante

TA8051

3A MOTOR DRIVER WITH BRAKE FUNCTION

Toshiba 

DESCRIPTION OF MULTI-PROTECTIVE OPERATION

TA8051P

The TA8051P has functions for protection from overvoltage (VSD) , overcurrent (ISD) , and overheat (TSD) .

These functions protect the IC (and the motor load in some cases) from deterioration or destruction due to

power-related overstress.

The three functions work independently.

Each function is explained below.

1. Overvoltage protection (VSD)

· Basic operation

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

input signals. However, when the VCC voltage exceeds the detection voltage, the output enters

high-impedance state regardless of the input signals.

· Detailed explanation

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

a resistor. When the center voltage of the resistor is higher than the Zener voltage, a transistor-off

instruction is issued to the control logic. When it is lower than the Zener voltage, the logic is controlled by

the input signals from pins 1 and 2.

2. Overheat protection (TSD)

· Basic operation

When the junction (chip) temperature is up to the TSD detection temperature, the output is controlled by the

input signals. When it exceeds the TSD detection temperature, the output enters high-impedance state

regardless of the input signals.

· Detailed explanation

The temperature is detected by monitoring VF of a diode on the chip. When the diode VF is lower than the

internal reference voltage, an output transistor-off instruction is issued to the control logic. When it is higher

than the internal reference voltage, the logic is controlled by the input signals from pins 1 and 2.

3. Overcurrent protections (ISD)

· Basic operation

When the output current (pin 4 or 8, Isink or Isource) is up to the ISD detection current, the output is

controlled by the input signals. When it exceeds the detection current, the output assumes a switching

waveform as shown in Fig.1.

Fig.1 Basic Operation

3

2002-02-27

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