L4981AD

$3.13

Description：IC PFC CTR AVER CURR 100KHZ 20SO
Series：-
Mfr：STMicroelectronics
Package：Tube

SKU:ec20fc1e39c3 Category: PFC (Power Factor Correction) Brand: STMicroelectronics

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Product introduction

Product Detailed Parameters

Description：IC PFC CTR AVER CURR 100KHZ 20SO
Series：-
Mfr：STMicroelectronics
Package：Tube
Mode：Average Current
Frequency - Switching：100kHz
Voltage - Supply：14.5V ~ 19.5V
Operating Temperature：-40°C ~ 125°C
Mounting Type：Surface Mount
Package / Case：20-SOIC (0.295", 7.50mm Width)
Supplier Device Package：20-SO
Current - Startup：100 µA
Grade：-
Qualification：-

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L4981AD

Overview

The L4981AD is a fixed frequency average current mode Power Factor Correction (PFC) controller manufactured by STMicroelectronics. It operates within a supply voltage range of 12V to 19V and features a switching frequency of 115 kHz. The device supports universal input mains voltages between 85V and 265V without requiring line switches. It utilizes BCD 60II technology and includes integrated protections such as overvoltage, overcurrent, and soft start. The component is housed in a 20-pin SO-20 surface mount package with an operating temperature range from -40°C to 125°C.

Feature Summary

Fixed frequency average current mode PWM control for sinusoidal line current maintenance
Integrated high-current bipolar and DMOS totem pole output gate driver
Built-in overvoltage and overcurrent protection with programmable thresholds
Low startup current consumption with under-voltage lockout featuring hysteresis

Applications

Universal input AC-DC power supplies
Server and telecommunications power units
High-efficiency pre-regulator designs

Procurement Notes

Verify the specific suffix against official datasheets to confirm fixed frequency operation versus line-modulated variants. Ensure the package type matches the required PCB footprint. Confirm active status and lead times through authorized distributors. Validate RoHS compliance documentation prior to integration into final assemblies.

Selection Notes

Select this component for applications requiring fixed frequency operation to optimize input filter size. It is suitable for systems needing average current mode control without slope compensation. Consider the SO-20 package constraints and thermal requirements for the intended enclosure design.

Part Context

The L4981AD belongs to the L4981A series, which provides fixed frequency average current mode control. This distinguishes it from the L4981B series that offers line-modulated frequency operation. Both series share similar control architectures but differ in frequency modulation strategies for input filter optimization.