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

关键词： Fairchild , FAN621S , FL7930B , LED , 街灯照明电源

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.

The FL3930B provides an additional OVP pin that can be used to shut down the boost power stage when output voltage exceeds OVP level due to damaged resistors connected at the INV pin. The FL7930C provides a PFC-ready pin can be used to trigger other power stages when PFC output voltage reaches the proper level (with hysteresis).

FL7930主要特性：

 Additional PFC-Ready Function (FL7930C Only)

 Input-Voltage-Absent-Detection Circuit

 Maximum Switching Frequency Limitation

 Internal Soft-Start with Overshoot Prevention

 Internal Total Harmonic Distortion (THD) Optimizer

 precise Adjustable Output Over-Voltage Protection

 Additional OVP Detection Pin (FL7930B Only)

 Open-Feedback Protection and Disable Function

 Zero-Current Detector

 150μs Internal Startup Timer

 MOSFET Over-Current Protection (OCP)

 Under-Voltage Lockout with 3.5V Hysteresis

 Low Startup and Operating Current

 Totem-Pole Output with High State Clamp

 +500/-800mA Peak Gate Drive Current

 8-Pin Small Outline Package (SOP)

FL7930应用：

Ballast

General LED Lighting

Industrial, Commercial, and Residential Fixtures

Outdoor Lighting: Street, Roadway, Parking, Construction and Ornamental LED Lighting Fixtures

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图1。FL7930B方框图

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图2。FL7930C方框图

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图3。FL7930B PFC应用电路图

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图4。FL7930B 单级反激转换器应用电路图

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