Variable Power Supply using LM2596

[pravardhan]

Hi,

After seeing a article on Variable Switching Power Supply (UniLab) in Elektor magazine, I wanted to build the same.

The UniLab circuit uses LM2576-Adj.

But, 2 years back i got free samples of LM2596 (5v,12v and Adj versions) from National Semiconductors. These are Lower Input versions and NOT "HV" versions. I went for LM2596 because of higher switching means lower inductor values.

So, my question is can i use LM2596 instead of LM2576 to build a Variable Switching Power Supply. And, i don't need a current limit in the power supply. Or does it require any modifications?

Bye,
PRAVARDHAN

 

[dselec]

i looked at both parts no connection to current limit higher freq is smaller choke that's all

 

[pravardhan]

Well, i made a mistake in my first post. That is, i have the sample of LM2678-Adj instead of LM2596-Adj. LM2678 is a 5A Step-Down Voltage Regulator.

So, can i use LM2678-Adj instead of LM2678-Adj.

@dselec:
The current limiter circuit is a feature given in the Elektor Magazine Article. Mainly used for Short-Circuits and over loading of the power supply.

National Semiconductor has not given any details about the current limiter. Well, may be some sort of protection must be inside the IC's.

Link for the Article in Elektor Magazine: (If anytime link is broken, tell me i will scan the circuit diagram and send it):
**broken link removed**