The high-voltage power supply and lower limit alarm circuit

Published:2011/6/22 1:39:00 Author:Borg | Keyword: high-voltage, power supply, lower limit | From:SeekIC

In the circuit is the high-voltage power supply and low limit alarm circuit. The circuit consists of the top limit alarm circuit and the lower limit alarm circuit. The right part is the lower limit alarm circuit: when the power supply voltage is close to the lower limit (but still normal), just adjust the potentiometer Wz, then the LEV of 556 8-pin is a little higher than 1/3VDD. When the power supply moves lower and makes the 8-pin LEV under l/3VDD, the 556 9-pin is reversing and outputting a high LEV, so the lower limit makes LED2 light. At the same time, the transistor BG is connected with 9-pin.



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