原标题：Fairchild FAN7529大功率LED镇流方案

　　Fairchild公司的大功率LED镇流器采用谐振半桥转换器FSFR2100和PFC控制器FAN7529,通用输入电压90-265Vrms,总输出功率200W,提供六个恒流直流输出,每个容量为0.7A/48V.也可改变为0.35A/96V.本文首先介绍了FAN7529和FSFR2100的主要特性,方框图,典型应用电路.接着介绍了200W LED镇流器电源解决方案的详细电路图和所用材料清单(BOM).

　　The FAN7529 is an active power factor correction (PFC) controller for boost PFC applications that operates in critical conduction mode (CRM). It uses the voltage mode

　　PWM that compares an internal ramp signal with the error amplifier output to generate 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 the input voltage sensing network necessary for the current-mode CRM PFC controller.

　　FAN7529 provides many protection functions, such as over-voltage protection, open-feedback protection, overcurrent protection, and under-voltage lockout protection.

　　The FAN7529 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65μA. Using a new variable on-time control method, THD is lower than the conventional CRM boost PFC ICs.

　　FAN7529主要特性:

　　Low Total Harmonic Distortion (THD)

　　Precise Adjustable Output Over-Voltage Protection

　　Open-Feedback Protection and Disable Function

　　Zero Current Detector

　　150μs Internal Start-up Timer

　　MOSFET Over-Current Protection

　　Under-Voltage Lockout with 3.5V Hysteresis

　　Low Start-up (40μA) and Operating Current (1.5mA)

　　Totem Pole Output with High State Clamp

　　+500/-800mA Peak Gate Drive Current

　　8-Pin DIP or 8-Pin SOP

　　FAN7529应用:

　　Adapter

　　Ballast

　　LCD TV, CRT TV

　　SMPS

图1.AN7529功能方框图

图2.FAN7529典型Boost PFC应用

图3. FAN7529典型应用电路图

　　演示板电路元件列表:

采用FSFR2100的200W电源解决方案

　　The FSFR-series are highly integrated power switches designed for high-efficiency half-bridge resonant converters. Offering everything necessary to build a reliable and robust resonant converter, the FSFR-series simplifies designs and improves productivity, while improving performance. The FSFR-series combines power MOSFETs with fast-recovery type body diodes, a high-side gate-drive circuit, an accurate current controlled oscillator, frequency limit circuit, soft-start, and built-in protection functions. The high-side gate-drive circuit has a common-mode noise cancellation capability, which guarantees stable operation with excellent noise immunity. The fast-recovery body diode of the MOSFETs improves reliability against abnormal operation conditions, while minimizing the effect of the reverse recovery. Using the zero-voltage-switching (ZVS) technique dramatically reduces the switching losses and significantly improves efficiency. The ZVS also reduces the switching noise noticeably, which allows a small-sized Electromagnetic Interference (EMI) filter.

　　FSFR2100主要特性:

　　Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topology

　　High Efficiency through Zero Voltage Switching (ZVS)

　　Internal Super-FET s with Fast-Recovery Type Body Diode (trr=120ns) for FSFR2000/1900/1800/1700

　　Fixed Dead Time (350ns) Optimized for MOSFETs

　　Up to 300kHz Operating Frequency

　　Pulse Skipping for Frequency Limit (Programmable) at Light-Load Condition

　　Remote On/Off Control Using Control Pin

　　Protection Functions: Over-Voltage Protection (OVP), Over-Load Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)

　　FSFR2100应用:

　　PDP and LCD TVs

　　Desktop PCs and Servers

　　Adapters

　　Telecom Power Supplies

　　Audio Power Supplies

图4.FSFR2100方框图

　　图5.FSFR2100典型应用电路 (LLC 谐振半桥转换器)

图6.FSFR2100典型应用电路

　　This document describes the proposed solution for a 200 W Power Supply using the FSFR2100 Fairchild Power Switch (FPS). The input voltage range is 90 – 265 VRMS and there are six outputs with 0.7A / 48V max. each. The board consists of a high power factor pre-regulator based on the FAN6961 voltage mode PFC controller and an isolated DC/DC converter based on a resonant LLC topology.

　　This document contains the power supply specification, schematic, bill of materials and transformer documentation.

　　200W电源解决方案材料清单(BOM):