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
