Push-Pull Driver Provides Isol

the circuit in figure 1 converts a regulated 5v input to an isolated 5v output with 1a current-output capability. ic1, a push-pull transformer driver, powers a pair of cross-coupled power mosfets in a flip-flop-like configuration. in turn, the mosfets toggle the primary winding of a forward transformer. the transformer's secondary output, after rectification and filtering, provides the isolated 5v supply. because the output voltage is unregulated, its voltage tolerance depends on the input-voltage range and the range of load current. with schottky rectifiers, such as the mbrs130 for d1 and d2, the circuit delivers 5v ±10% at 700 to 1000ma from a 5v ±5% input with 80% efficiency (figure 2). using ultrafast-recovery silicon rectifiers, such as the murs120, the circuit delivers 5v ±10% at 200 to 500 ma from a 5v ±5% input, with 77% efficiency. (di #2502)
figure 1. a simple circuit produces a 5v, 1a isolated output from a 5v regulated input.
figure 2. the efficiency of the circuit in figure 1 depends directly on the forward drops of the output rectifiers.
reprinted from edn magazine march 30, 2000
copyright cahners business information 2000
a division of reed elsevier inc.

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