SMPS controller - how does it get its own start up power??
- From: "siliconmike" <siliconmike@xxxxxxxxx>
- Date: 5 Dec 2005 13:12:46 -0800
I figured that an SMPS controller IC receives power from one of the
windings on the transformer core. The controller then uses PWM to
switch the primary winding.
But then how does the controller IC receive a kick startup power in the
first place (since the PWM switching has not yet begun and the FET
switch is off yet) ?
Please explain.
Mike
.
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