Pressurization transform power supply circuit with the frequency automatic offset features composed of the MAX630

Published:2011/5/25 19:20:00 Author:Christina | Keyword: Pressurization, transform, power supply, frequency, automatic offset | From:SeekIC

The low voltage frequency offset pressurization transform power supply which is composed of the MAX630's low battery voltage detection function is as shown. The feature of this circuit is: when the battery voltage is lower than nominal value (3V), about 2V, this circuit can highly efficiency (85%) supply the 40mA,5V DC voltage at the output port. The process is: the battery voltage drops, and causes the voltage of MAX630's pin1 (from the R3 and R4's separate pressure of the battery electric) todrop too, when the voltage is lower than the battery voltage detection comparator's threshold voltage (1.31V), the detection output port (pin-8) LBD becomes the low-level voltage, this connects the C1 together with the Cx and reduces MAX630 internal oscillator's frequency.



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