The L4981A L4981B power factor corrector controller can achieve a power factor of up to 0.99. It also limits line current distortion to less than 5%. The chip is made using BCD 60II technology and has all the features of a power factor corrector (PFC) pre-regulator, including line and load regulation, average current mode PWM, high current bipolar and DMOS totem pole output, low start-up current (typ. 0.3 mA), undervoltage lockout with hysteresis and programmable turn-on threshold, overvoltage, overcurrent protection, precise 2% on-chip reference, and external soft start.
The L4981A and L4981B are Power Factor Corrector (PFC) pre-regulators designed to achieve a power factor up to 0.99 with sinusoidal line current consumption. Realized in BCD 60II technology, these devices operate with universal input mains between 85V and 265V without line switching. The L4981A operates at a fixed frequency, while the L4981B offers modulated frequency optimization.
| Power Factor | Up to 0.99 |
|---|---|
| Line Current Distortion | < 5% |
| Input Mains Voltage | 85V to 265V |
| Start-up Current | 0.3mA Typ. |
| Reference Voltage Accuracy | 2% |
| Operating Ambient Temperature | -40 to 125 °C |
The L4981A operates at a fixed frequency, while the L4981B works with modulated frequency to optimize filter size.
The device features a low start-up current of 0.3mA typical.
Yes, for the L4981A the overcurrent level can be programmed using a simple resistor.