Depletion-mode MOSFET kick-starts power supply

by Gregory Mirsky, Milavia International, Buffalo Grove, IL; Edited by Charles H Small and Fran Granville, EDN, Jan 10 2008

Focus:
Power losses associated with power-supply start-up circuitry can be nearly eliminated using a startup circuit built around a high-voltage, depletion-mode MOSFET.

What you’ll learn:

• How to minimize power consumption of power supply start-up circuitry using a depletion-mode MOSFET

Notes:
An EDN Design Idea

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