Add a grounded-switch feature for Topswitch on/off control

by Robert N Buono, Aeolian Audio LLC, Bloomfield, NJ; Edited by Charles H Small and Fran Granville, EDN, Jun 21 2007

Focus:
A one-transistor circuit adds on-off control to a Topswitch switching regulator IC and allows use of a mechanical switch so that no external power is required for on-off control.

What you’ll learn:

• How to add on-off control to a Topswitch switching regulator IC
• How to toggle a Topswitch switching regulator on and off without external power

Notes:
An EDN Design Idea

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