LM317 +short circuit protection

Thread Starter

binod

Joined Apr 3, 2009
4
Hi this is my first post ,
i am working with voltage regulator .One that i am using is LM317.
the problem is that when ever the output is getting shorted,it is drawing a lot of current .
i want to shutdown LM317 as the output is shorted.
can anyone advice?
 

SgtWookie

Joined Jul 17, 2007
22,201
Go to National Semiconductor's website:
http://www.national.com
Download the datasheet for the LM117/LM317 regulator.
Look on page 19. The 2nd schematic is for a current limited voltage regulator.
 

mik3

Joined Feb 4, 2008
4,846
Post your circuit.

How much current does it draws when shorted?
 

Thread Starter

binod

Joined Apr 3, 2009
4
But why short it? you doing that on purpose ?[/quote]

I am designing a power supply with three outputs with flyback topology.The Design is such that it can support limited current. One of the output of flyback is connected to LM317 to give constact voltage .

The output of the Lm317 is connected to a connector having numerous pins.
There is a chance of getting short circuit at this connector .When ever this short circuit occur it draws huge current overlimiting my flyback current limitation .hence i want that whenever the LM317's output is getting shorted it gets shutdown .

Help me how it can be done?
 

SgtWookie

Joined Jul 17, 2007
22,201
Did you bother to look at the datasheet I suggested?

A solution is on page 19.
 
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