TA8053 查看數據表（PDF） - Toshiba
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TA8053 Datasheet PDF : 10 Pages
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TA8053H
DESCRIPTION OF MULTI-PROTECTIVE OPERATION
The TA8053H has functions for protection from over-voltage (VSD), over-current (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 reference voltage which is constracted by zenner diode.
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 VBE of a transistor on the chip. When the transistor VBE 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
2002-01-30
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