Key facts
- Brand
- STMicroelectronics
- Model
- L4981A
- Category
- Power Management
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-10
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ST L4981A L4981B POWER FACTOR CORRECTOR handbook
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.
Read onlineSTMicroelectronics L4981A specifications
| Output Power | 500W |
|---|---|
| Input Voltage Range | 88Vac to 264Vac |
| Output Voltage | 400Vdc |
| Switching Frequency | 80kHz |
| Input Power Factor | > 0.99 |
| THD | < 5% |
Source: STMicroelectronics AN827 L4981A 500W PFC Application Note
All STMicroelectronics L4981A documents by type
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
Can the L4981A be used as a master or slave?
Yes, the device is provided with an input/output (I/O) synchronization pin which allows it to be used both as a master or a slave.
From: STMicroelectronics AN832 L4981A Synchronization Application Note
What is the frequency requirement for the master oscillator?
The master oscillator frequency must be higher than the slave one in any condition.
From: STMicroelectronics AN832 L4981A Synchronization Application Note
What IC is used in this 500W PFC design?
The design employs the L4981A Continuous Mode PFC IC.
From: STMicroelectronics AN827 L4981A 500W PFC Application Note
What is the maximum output overvoltage rating?
The maximum output overvoltage is set to 450V.
From: STMicroelectronics AN827 L4981A 500W PFC Application Note