a circuit that converts positive voltage to negative voltage

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wien

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How can I make a circuit that outputs a negative voltage of -12V if I input a positive voltage?

I don't have a part called LM2575-12BT here, can you recommend it as one of the parts on mouser.kr ?
 

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Hi,

a power supply voltage? -> maybe a switched capacitor inverter
or a signal voltage? --> maybe an inverting OPAMP circuit

in a way that 12V becomes -12V?

and 13V becomes -13V?
or 13v stil become -12V?

What current?
What accuracy?
What efficiency?
Is noise an issue? If yes, specify the max.

Klaus
 

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I've seen but never used those parts made to look like 7812 but with switcher guts in the classic TO-220 form. Seems to me that an inverting version of those could be made same-same. Whether the vendor or the market ever saw traction, no idea.
 

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The full data sheet covers this quite well - how to organise the feedback etc - also the need for a delayed start - as the device will otherwise draw a lot of current from the source.
 

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