Boost has a frequency characteristic of automatic offset MAX630 power conversion


Posted on Mar 28, 2007

As shown is a low voltage frequency use MAX630 low battery voltage detection function constitutes offset boost converter power supply. It features when the battery voltage is b


Boost has a frequency characteristic of automatic offset MAX630 power conversion
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elow the nominal value (3V) a lot of time (down to 2V), still at the output high efficiency (85%) to provide a DC voltage 40mA, 5V of. The process is the decline in battery voltage, causing MAX630 1 pin voltage (by R3 and R4 for dividing the battery voltage obtained) also dropped, the current drops below the battery voltage detection comparator threshold voltage (1.31V), the detection output end ( feet) LBD goes low (ground), the C1 and Cx and connected together, thereby reducing the MAX630 internal oscillator frequency. Increase the output power to compensate for the decrease in the output voltage of the battery power shortage, keeping the output power constant.




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