Ringing type switch power supply power expansion method

Published:2011/7/15 22:54:00 Author:Christina | Keyword: Ringing type, switch, power supply, power expansion | From:SeekIC

In the simple ringing current-limit power supply circuit, in order to make the output voltage stable, we need to connect the voltage-regulator diode with the base electrode of the switching transistor VTl, so the output voltage can not be adjusted. In addition, if you want to increase the output power, you need to increase the driving current. At this time, if you decrease the output current, the subcircuit current of the voltage-regulator diode will increase. This will change the voltage stabilization value of the voltage stabilization diode, even more than the allowable value of the voltage stabilization diode. So in order to improve the output power, we can use the method of add a current expansion transistor which is as shown in the figure.



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