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The function of pass transistor in high current power supply

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soon1401

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Pass Transistor

what is the function of pass transistor in the high current power supply design?
 

Re: Pass Transistor

Pass transistor is usually defined as transistor between Vin and Vout of a linear regulator.

For a high current power supply, generally SMPS is applied for high efficiency reason. If so, there will not be pass transistor.
However, for some applications in which low noise is a concern, linear regulator will be used between SMPS output and load to improve noise performance. Of course this will seriously decrease efficiency.
 

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