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L4985

更新时间： 2024-09-17 14:57:59
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 功率因数校正
页数 文件大小 规格书
27页 1290K
描述
Continuous conduction mode (CCM) PFC controller with high voltage startup

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L4985 数据手册

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L4985  
Datasheet  
CCM PFC controller with high voltage startup  
Features  
•
•
•
•
Peak current mode CCM-operated  
800 V high voltage startup with integrated input voltage sensing  
Active input filter capacitor discharge  
Proprietary multiplier “emulator” with minimum THD of line current in all  
operating conditions (CCM and DCM)  
•
•
Extremely few external components  
Protections: feedback loop failure, OVP, OCP, inductor saturation, brown-in,  
brownout (compliant to medical SMPS standards)  
•
•
•
•
•
•
•
Inductor current sense  
Disable and low consumption function  
In-rush current monitoring  
Soft-start for smooth startup  
1.2% (@ Tj = 25 °C) internal reference voltage  
65 kHz (A version) and 130 kHz (B version) switching frequency  
SO8 package  
Application  
•
PFC pre-regulators for:  
–
–
–
–
IEC61000-3-2 and JEIDA-MITI compliant SMPS in excess of 1 kW  
Desktop PC, server, web server, game console  
High power LED luminaries  
Product status link  
L4985  
Industrial and medical SMPS according to IEC 60601-1-2  
L4985A  
L4985B  
Description  
L4985ATR  
L4985BTR  
The L4985 is a peak current-mode PFC controller for boost converter with a  
proprietary multiplier “emulator” which in addition to the innovative THD optimizers  
guarantee very low Total Harmonic Distortion (THD) performance in all operating  
conditions. The device comes in a pin SO package and offers a high performance/  
low-component count solution for CCM-operated boost PFC pre-regulators in  
EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans  
from few hundred W to some kW.  
Product summary  
Order  
codes  
Package  
Packaging  
L4985A  
L4985B  
Tube  
Tube  
The device, thanks to a proprietary off-time modulator, operates in quasi-fixed  
frequency in all operating conditions. Two options are available, 65 kHz for A and  
130 kHz for B.  
Tape and  
reel  
SO-8  
L4985ATR  
L4985BTR  
The 800V high voltage start-up block includes also the circuitry to discharge the  
X-capacitors of the EMI filter to a safe level. This allows the unit to meet safety  
regulation (such as IEC 61010-1 or IEC 62368-1) without using the traditional  
discharge resistor in parallel to the X-capacitors.  
Tape and  
reel  
The device features low consumption and disable functions allowing usage in  
applications supposed to comply even with the latest energy saving requirements  
issued by Energy Star, the Department of Energy (DoE) in the United States, the  
European Code of Conduct, the European Union’s Ecodesign Directive, and other  
guidelines.  
DS13769 - Rev 3 - January 2022  
For further information contact your local STMicroelectronics sales office.  
www.st.com  
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