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Transistor enhanced linear regulator, options to boost max output current.

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David_

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Hello.

I'm having difficulties deducing which addition of what type of transistor is the best option for me while enabling a variable linear regulator to use its max 50mA output to be used as a max 5A output.

Here are two examples I know of, the NPN darlington is the one I went with first and have it on a prototype in front of me but I want to know what is the pros and cons between these two and is there any other variation of this.
One thing I really want to know is if a MOSFET could be used in place of a BJT here in some way?
reg+bjt.png

I do get that the PNP choice do not add any voltage drop and thats great but does it count for something that the NPN is within the regulators feedback loop?

The application is a lab power supply and it will go down to something like 30mV as 0V output, but as this circuit is used as a post-regulator it will never be asked to deal with more than 25W or something like that.

Regards
 

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