Infineon IRS2505L+IRS29875W LED参考设计IRXLED10

Infineon公司的IRXLED10是75W两级非调光LED驱动器参考设计,拓扑包括功率因素修正(PFC)升压转换器前端IRS2505L控制器和严格调整的恒流(CC)稳压降压LED驱动器IRS2982.IRS2505L是临界导通模式(CrCM) PFC控制器,可用在高达150W的电源和照明应用.基于IRS2505L的升压PFC预转换器能满足EN 61000-3-2规范,包括照明应用的C类限值.某些条件下,它能用在开关电源(SMPS)拓扑如降压,降压-升压和反激.IRS2982 LED驱动器提供精密控制的电流和保护,免受过载对LED的损害.参考设计IRXLED10的AC输入电压从90 V AC到高达265 V AC (55 - 65 Hz),输出电压在360 mA +/-1.5 mA电流为60到200 V DC,最大输出连续功率为75W,最大负载和90 - 265 V AC输入电压时PF大于0.9,总谐波失真((iTHD)小于20%,效率大于90%.本文介绍了75W LED驱动器参考设计IRXLED10主要特性和指标,电路图,材料清单和PCB设计图.
The IRS2505L is a CrCM boost PFC controller IC. All of the functionality for controlling the PFC pre-converter is integrated into the SOT23-5 package. This low pin count solution operates by using multi-functional VBUS and PFC pins so that the cycle-by-cycle Current Sense (CS) input is combined with the output voltage feedback at the VBUS pin and the Zero Crossing (ZC) sensing function is combined with the gate drive at the PFC pin.
At the start of each switching cycle the PFC pin gate drive output pulls the PFC pin voltage high and the external MOSFET turns on, where the on-time duration is set by the (CMP) pin voltage. The internal PFC control loop regulates the CMP pin voltage, which determines the on-time such that if the DC bus voltage increases then the CMP pin voltage and on-time will decrease, and vice versa. Decreasing the on-time reduces the peak inductor current, transferring less energy per switching cycle and causing the DC bus voltage to decrease. If the DC bus voltage decreases below the desired level the CMP pin voltage, on-time will increase to compensate. This negative feedback control loop regulates the DC bus to a constant voltage over AC-line voltage or output load variations. The speed of regulation is determined by the internal OTA tr...