Datasheet Summary
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Power Factor Controllers
The MC34261/MC33261 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off- line power converter applications. These integrated circuits feature an internal startup timer, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction operation, high gain error amplifier, trimmed internal bandgap reference, current sensing parator, and a totem pole output ideally suited for driving a power MOSFET. Also included are protective Features consisting of input undervoltage lockout with hysteresis, cycle- by- cycle current limiting,...
