LM5015

SNVS538C – NOVEMBER 2007 – REVISED APRIL 2013

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Figure 26. Isolated Two-Switch Flyback

DC-DC TRANSFORMER

The DC-DC transformer shown in Figure 27 provides a 1:1 input voltage to output voltage conversion with

ground isolation. The circuit operates in open loop manner operating at the maximum duty cycle limit of the

LM5015. The power transformer primary-secondary turns ratio is 1:2 (primary to secondary). Therefore, at the

maximum duty cycle of 0.5, the output voltage will be approximately equal to the input voltage. A Zener diode Z1

is used at the output rail as a simple means to protect the output against over-voltage under light and no load

conditions. The maximum load of this example circuit is 0.3A, and the operating voltage range is from 5V to 15V.

Figure 27. DC-DC Transformer

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