DZW75-48/5050II steady voltage and current limiting, current sharing circuit

Published:2011/12/4 20:22:00 Author:May | Keyword: steady voltage, current limiting, current sharing | From:SeekIC

The steady of output voltage is mainly using the principle of negative feedback, the sample value of output value is returned back to error comparator, and it uses error voltage output by error comparator to control or modulate (adjust) the output pulse width of pulse width modulator, thereby adjust the height of output voltage to achieve the purpose of steady voltage output. As shown in the diagram, sampling voltage LOAD (-) is sent to “-” end of error comparator N3 resistor R19, then the “+” end of N3 is connected to -4.3V reference voltage offered by -12V power supply and voltage regulator diode V9 by resistor R17, when it is in normal operation, K4 contact point lies to -12V. In fact, N3 is a different amplifier.



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