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Fairchild FL7930B和FAN621S 150W LED街灯照明电源解决方案

关键词:电源管理 AC/DC转换器 DC/DC转换器 PFC LED驱动器 LED街灯照明

时间:2011-11-10 09:52:47       作者:Fairchild       来源:FL7930B

Fairchild 公司的FL7930B是用于照明的单级反激和边界模式PFC控制器,采用电压PWM来产生MOSFET关断信号。+500/-800mA峰值栅极驱动电流,并提供过压,反馈开路,过流,输入电压缺失检测和欠压锁住保护,主要用在镇流器,通用LED照明,工业,商业和住宅区装饰照明以及室外照明。本文介绍了FL7930主要特性,方框图,几种典型应用电路以及采用FL7930B和FAN7621S的150W LED开关电源参考设计主要指标,电路图和材料清单。

FL7930:Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting

The FL7930 is an active Power Factor Correction (PFC) controller for low-to high-power lumens applications that operate in Critical Conduction Mode (CRM). It uses a voltage-mode PWM that compares an internal ramp signal with the error amplifier output to generate a MOSFET turn-off signal. Because the voltage-mode CRM PFC controller does not need rectified AC line voltage information, it saves the power loss of an input voltage sensing network necessary for a current-mode CRM PFC controller.

FL7930 provides over-voltage, open-feedback, overcurrent, input-voltage-absent detection, and undervoltage lockout protections. The FL7930 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to a very low level.Using a new variable on-time control method, THD is lower than the conventional CRM boost PFC ICs.
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