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LM337 Negative Voltage Regulator Gets Very Hot, Is This Normal? Duplicate

2021-06-27

pinpai

Let's do the math:$(12textV 3.2textV) 700textmA 6.16 textW$ That's a lot of power, being wasted directly as heat. Consider using a switching regulator instead. Or an actual LED driver (which will be a switching regulator under the hood).

This question already has answers here: My linear voltage regulator is overheating very fast (6 answers) Closed 6 years ago.

I used the LM337 negative regulator to regulate a 12V from a PC power supply.

And connected the GND to input and the 12 to ground of the circuit, and i got it work (i mean it's regulating the voltage) but the problem is it's get very hot even with heat sink connected to it. Is that normal because i didn't keep it on for a long time.

It used to regulate 12 volts to 3.2 volts.

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