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thx BradtheRad. why i don't use the zener, that is my loading is not fixed swinging from 0 to 200mA. and also i need the isolate the AC and final output. the voltage dropping circuit could help for a smaller transformer.
i'm just curious why with the NCP, the power dropped so much.
thx.
thx. Why i use the NCP as the 2nd level, that is my loading is not fixed(0w-1w, 0-200ma) which may beyond the the zener capacity. and Also i need a isolated circuit. i use the RC voltage dropping to reduce the 2nd level input voltage which will bring me a smaller transforme.
i am just curious...
in my AC/DC power supply circuit, I first use a voltage dropping capacitor to reduce incoming voltage. For the load stability, then I add the NCP1010(current model regulator) circuit as the 2nd level. Here is the findings:
1. Voltage dropping circuit itself is ok. Without the NCP1010 circuit...
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