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Voltage regulator with Vin up to 40 V DC

Discussion in 'General Electronics Discussion' started by Dkuriloff, Jan 18, 2010.

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  1. Dkuriloff


    Jan 18, 2010
    Hi all:

    I have a circuit that needs ~ 35 volts DC (unregulated) @ 8 AMPS to drive a flyback primary coil and a oscillator controller circuit using a UC3844 that requires 18 volts regulated + DC @ 500ma. My stepdown 8 amp transformer gives ~27 volts from the 120 v mains and after full bridge rectification and filtering I get 37-38V (no load). I want to use the same transformer for both parts of the circuit. It is center tapped. I can use an LM7818 and a few series diodes to drop the input DC voltage from the transformer to below 35Vin (max for the LM 7818) or an adjustable voltage regulator like the L200.

    I thought the the L200 would be a more versatile solution since I could eliminate the voltage dropping diodes. Any thoughts?

    What are the differences between the L200, L200C, L200CV, L200CH?

    Where can I purchase just 10 pieces without the shipping costing more than the parts?

    Is there another more available adjustable voltage regulator that can tolerate 38-40 volts DC in (rectified AC, filtered DC) and output 15-18 volts at ~ 500 ma??

    Here is the circuit:

    Thanks for the help
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