Hi,

Many thanks for all the replies. I have looked at the links and found
(tripped over) a suitable IC. It is the LM2574HV which will handle an input
voltage of 63v and give 5v at 500mA.

Have just ordered some so thanks again.

Bob




-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Bob
Sent: 25 June 2008 9:58 AM
To: piclist@mit.edu
Subject: [EE] Switch voltage Regulator - What chip to use?

Hi,

 

Have been searching for a suitable switching regulator IC and I am totally
confused by the 1,000's of different types available!!!

 

Can anyone suggest a 'popular' easily available IC? Or a simple circuit?

 

It needs to handle an input voltage between 20 and 50 volts, supply a
current of between 30mA and 500mA with an output voltage of 5 volts.

 

Thanks,

Bob

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