Datasheet

OUTSR

Gate of the Sync MOSFET is

Drven by a winging on T1 and is

isolated

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Synchronous Forward MOSFET Enabled

Figure 13. Pre-Bias Load Waveforms

An alternative to using the circuit in Figure 12 is shown in Figure 14; an additional winding can be added

to the power transformer which can be used to drive the Forward Synchronous Rectifier MOSFET (M1).

This is a simple solution and should not add a lot of complexity to the transformer design.

Figure 14. Isolated Synchronous MOSFET Drive Using a Transformer

SNVA400B–August 2009–Revised May 2013 AN-1976 LM5027 Evaluation Board

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