EVAL4981A: 360W @ 400V, 88 ~ 264 VAC


The L4981 integrated circuit is a continous mode average current controller with several specific functions for active power factor correction. It can operate in high quality, medium/high power conversion range and provides all the necessary features to achieve a very high power factor, up to 0.99. Thanks to the BCD technology used, operative switching frequency higher than 200kHz can be used.

The L4981 can be used in systems with universal input mains voltage without any line switch.

This new PFC offers the alternative of synchronization working at fixed frequency (L4981A), or working in modulated frequency (L4981B) to optimize the size of the input filter. Both devices control the conversion in average current mode PWM to maintain a sinusoidal line current without slope compensation.


Manufacturer STMicroelectronics
Category Power Management
Sub-Category Power Factor Correction
Eval Board Part Number 497-5523-ND
Eval Board Supplier STMicroelectronics
Eval Board Normally In Stock
Output Power 360 W
Voltage In 88 ~ 264 VAC
Voltage Out 400 V
THD @ Conditions 6.4% @ 220 Vin
2.2% @ 110 Vin
Efficiency @ Conditions >96%, 220V in, 412V @ 381 W
>94%, 110 Vin, 406V @ 370 W
Features Over Current Protection
Over Voltage Protection
Soft Start
Under Voltage Protection, Brown-Out
Switching Frequency 100 kHz
Application / Target Market
Component Count + Extras 54 + 3
Design Author STMicroelectronics
Main I.C. Base Part L4981
Date Created By Author
Date Added To Library 2011-03

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