谐振半桥转换器FSFR2100和PFC控制器FAN7529

1、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 o

2、perates in critical conduction mode (CRM). It uses the voltage modePWM 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

3、 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

4、is lower than 0.45V and the operating current decreases to 65A. 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 ProtectionOpen-Feedback Protection and Disable Funct

5、ionZero Current Detector150s Internal Start-up TimerMOSFET Over-Current ProtectionUnder-Voltage Lockout with 3.5V HysteresisLow Start-up (40A) and Operating Current (1.5mA)Totem Pole Output with High State Clamp+500/-800mA Peak Gate Drive Current8-Pin DIP or 8-Pin SOPFAN7529应用:AdapterBallastLCD TV,

6、CRT TVSMPS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

7、-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 funct

8、ions. 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

9、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 Contr

10、ol 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

11、 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) FSFR21

12、00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