MC33262P - POWER FACTOR CONTROLLERS

 

 



The MC34262/MC33262 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 for stand–alone applications, a one quadrant multiplier for near unity

power factor, zero current detector to ensure critical conduction operation,

transconductance error amplifier, quickstart circuit for enhanced startup,

trimmed internal bandgap reference, current sensing comparator, and a

totem pole output ideally suited for driving a power MOSFET.

Also included are protective features consisting of an overvoltage

comparator to eliminate runaway output voltage due to load removal, input

undervoltage lockout with hysteresis, cycle–by–cycle current limiting,

multiplier output clamp that limits maximum peak switch current, an RS latch

for single pulse metering, and a drive output high state clamp for MOSFET

gate protection. These devices are available in dual–in–line and surface

mount plastic packages.

• Overvoltage Comparator Eliminates Runaway Output Voltage

• Internal Startup Timer

• One Quadrant Multiplier

• Zero Current Detector

• Trimmed 2% Internal Bandgap Reference

• Totem Pole Output with High State Clamp

• Undervoltage Lockout with 6.0 V of Hysteresis

• Low Startup and Operating Current

• Supersedes Functionality of SG3561 and TDA4817

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