Questions about LM2596 Buck Converter

[ElectricPower]

1. I have read that its possible to add heat sink to LM2596 to make it give som more current output. Is this a simple task to do? If yes...how?

2. I have an power adapter from an old laptop that gives 20V and 4.2amp. Can i safely connect it to LM2596? I know that max theoretical output still is 3amp (theoretical) but can i use that adapter anyway?

[wraper]

Are you talking about very cheap fake LM2596 modules from China?

[ElectricPower]

I think so... ibought it frem AliExpress. It is an LM2596S (with LED display). I think it cost me 1.20$.

It is this one i ordered:
https://www.aliexpress.com/item/32825777330.html?spm=a2g0s.9042311.0.0.3fe34c4dQxQQSZ

[wraper]

Then it has nothing to do with real LM2596. They work at much lower frequency and actual specifications are not known.

[T3sl4co1l]

Try it. If it blows, you're out a buck and a counterfeit chip.

Tim

[ElectricPower]

I see.

But generally... can i connect a power adapter with 20v. and 4 amps as input til this converter? I suppose it's okey as long i do not uses that power in the other end?