diode usage in linear regulators

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sweethomela8

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Hi, I've seen people connect the output of a linear regulator to a diode forward biased with the other end connected to the input of the regulator...whats the purpose of this diode?

voltage input---> REGULATOR------->output to load
| |
<---diode---------

thanks.
 

The diode that is connected between the output and input pins is for the protection of regulators in case the input is shorten and the output has a substantial electrolytic/tantalum capacitor connected to it ..
It is really individual issue for voltage regulators, and more details on requirement of a particular voltage regulator can be usually find in their data sheets ..
Eg. **broken link removed**
See section on protection diodes ..

IanP
:-D
 
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