關鍵詞： Fairchild , FAN621S , FL7930B , LED , 街燈照明電源

Fairchild 公司的FL7930B是用于照明的單級反激和邊界模式PFC控制器，采用電壓PWM來產生MOSFET關斷信號。+500/-800mA峰值柵極驅動電流，并提供過壓，反饋開路，過流，輸入電壓缺失檢測和欠壓鎖住保護，主要用在鎮流器，通用LED照明，工業，商業和住宅區裝飾照明以及室外照明。本文介紹了FL7930主要特性，方框圖，幾種典型應用電路以及采用FL7930B和FAN7621S的150W LED開關電源參考設計主要指標，電路圖和材料清單。

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應用：

Ballast

General LED Lighting

Industrial, Commercial, and Residential Fixtures

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

2011-11-10 16:50:52 上傳

2011-11-10 16:50:52 上傳

2011-11-10 16:50:52 上傳

2011-11-10 16:50:52 上傳

2011-11-10 16:50:52 上傳