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参数资料
| 型号： | TA8050F |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, PDSO20 |
| 封装： | 0.450 INCH, 1 MM PITCH, HEAT SINK, POWER, PLASTIC, SOP-20 |
| 文件页数： | 3/9页 |
| 文件大小： | 184K |
| 代理商： | TA8050F |
TA8050F
2002-02-27
3
Description of Multi-Protective Operation
The TA8050F has functions for protection from overvoltage (VSD), overcurent (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 DI1 and DI2.
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 DI1 and
DI2.
DI1
DI2
CONTROL LOGIC
VSD
M (
)
M (
+)
ISD
TSD
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