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MC33368D HighVoltageGreenLine PowerFactorController www.ic-stocks.com

  • Συγγραφέας:salmon ye
  • Πηγή:www.ic-stocks.com
  • Απελευθερώστε το:2021-11-19

PowerFactorController

The MC33368 is an active power factor controller that functions as aboost preconverter in off–line power supply applications. MC33368 is optimized for low power, high density power supplies requiring a

minimum board area, reduced component count and low power dissipation.

The narrow body SOIC package provides a small footprint. Integration of the high voltage startup saves approximately 0.7 W of power compared to resistor bootstrapped circuits.

The MC33368 features a watchdog timer to initiate output switching, a one quadrant multiplier to force the line current to follow the instantaneous line voltage a zero current detector to ensure critical

conduction operation, a transconductance error amplifier, a current sensing comparator, a 5.0 V reference, an undervoltage lockout

(UVLO) circuit which monitors the VCC supply voltage and a CMOS driver for driving MOSFETs. The MC33368 also includes a programmable output switching frequency clamp. Protection features include an output overvoltage comparator to minimize overshoot, a restart delay timer and cycle–by–cycle current limiting


Lossless Off–Line Startup

Output Overvoltage Comparator

Leading Edge Blanking (LEB) for Noise Immunity

Watchdog Timer to Initiate Switching

Restart Delay Timer




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