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.
|Sub-Category||Power Factor Correction|
|Eval Board Part Number||497-5523-ND|
|Eval Board Supplier||STMicroelectronics|
88 ~ 264 VAC
|THD @ Conditions||
6.4% @ 220 Vin
2.2% @ 110 Vin
|Efficiency @ Conditions||
>96%, 220V in, 412V @ 381 W
>94%, 110 Vin, 406V @ 370 W
Over Current Protection
Over Voltage Protection
Under Voltage Protection, Brown-Out
|Application / Target Market|
|Component Count + Extras||
54 + 3
|Main I.C. Base Part||