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DESCRIPTION

The SiP11203/SiP11204 provide the secondary side error amplifier, reference voltage and synchronous rectifier drivers for isolated converter topologies. Both ICs are capable of being powered via conventional bias supplies (output inductor winding or power transformer winding), or from a pulse transformer supplying the gate timing signals, and both parts generate a regulated supply for powering the error amplifier and control circuitry.

FEATURES

? High Current synchronous rectifier drivers

- 2.2 A source and 4 A sink

? Driver switching synchronized with primary controller

? Full output control during power-up and powerdown

? 5.5 V to 13 V operating voltage range

? 1.225 V on board bandgap voltage reference

? Can be powered from the pulse transformer supplying synchronous rectifier timing signals

? On-chip ground-sensing error amplifier

? Programmable rising edge delay

? Output over-voltage protection (OVP)

- SiP11203 turns synchronous rectifiers on

- SiP11204 turns synchronous rectifiers off

? Secondary-side companion chip for the Si9122 Half-Bridge Controller IC

APPLICATIONS

? High efficiency DC-DC Converter Modules and Bricks

? Telecom and Server Power Supplies

? High Efficiency Intermediate Bus Converters (IBC)

? Half-bridge, full-bridge, or push-pull primary DC-DC topologies

? Center-tapped or current-doubler secondary configurations