AnsweredAssumed Answered

High voltage input to 7805

Question asked by kalavadia.niral on Jul 29, 2016
Latest reply on Aug 1, 2016 by hexel.alexander
Hello,

We are using L78M05CDT-TR in our design since few years. We are satisfied with the result of product. However we are making new design (PFA) and we considering to use design suggested in datasheet for high voltage input.

Datasheet does not discuss anything about zener, transistor and resistor to be used, selection guideline for the same components is also not given. It would be great if someone can give more information regarding these components.

Main reason we are planning to go with this design is heat. Our input is 24v and circuit draws 200ma from regulator. If we go with this design will it produce less heat?

Regards,
Niral

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