source:Industry News Popular:adapter release time:2021-04-15 10:22:12 Article author:sznbone
In the integrated circuit chip of the power adapter, the power consumption of the driving device and the like is often very large. Because the power switch tube with high voltage and large current is integrated in the power adapter chip, the power consumption will be greater. The increase in power consumption increases the chip temperature, and an excessively high temperature will cause the semiconductor such as the original S tube and the transistor to fail. When the operating temperature of the chip exceeds a certain temperature value, the failure rate of the chip increases exponentially, and the chip may be burned. Therefore, temperature is one of the important factors affecting chip stability and reliability. In order to protect the chip from permanent damage, it is very necessary to integrate an over-temperature protection circuit in the chip.
What is the power adapter over-temperature protection circuit?
This circuit is an over-temperature protection circuit, but when the temperature is higher than the set protection point, the module output is turned off, and the module is automatically turned on when the temperature is restored.
Analysis of the working principle of the power adapter over-temperature protection circuit (main functions, performance indicators and implementation principles):
The voltage regulator tube provides 5V voltage to U103MAX6501. When the temperature is normal, the five pins of U103 output high level. When the temperature exceeds the protection point, the five pins of U103 output low level. When the temperature is restored, the five pins of U103 output high level. .
4 advantages and disadvantages of the circuit
The advantages of this circuit: simple circuit and high accuracy.
Disadvantages: higher cost.
5 Application notes:
5.1 When MAX6501's pin 3 and pin 1 are connected, the hysteresis temperature is 10°C, when its 3 pin is connected to the ground, the hysteresis temperature is 2°C.
5.2 The supply voltage of MAX6501 cannot exceed 7V, otherwise it will be damaged.
5.3 MAX6501 must be placed near the hottest part.
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