Off-line flyback regulator

Posted on Oct 8, 2012

This circuit uses a low-cost feedback scheme in which the dc voltage developed from the primary-side control winding is sensed by the UC1842 error amplifier. Load regulation is therefore dependent on the jcoupling between secondary and control windings, and on transformer leakage inductance.

Off-line flyback regulator
Click here to download the full size of the above Circuit.

For applications requiring better load regulation, a UC1901 Isolated Feedback Generator can be used to directly sense the output voltage.

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