Infineon 公司的EVAL-TDA4863G-40W 评估板是单级效率达90%的离线。该评估板采用TDA4863G和TLE4305G两个器件，效率高达90%，功率因素高达0.98，THD低，恒流恒压稳压精度+/- 2%，具有VCC过压和欠压保护，可以逐个周期对峰值电流进行限制。本文介绍了TDA4863主要特性和应用电路，EVALLED-TDA4863G-40W评估板主要特性，电路图，材料清单和变压器电路图。

Single Stage High Power Factor Flyback Converter for Offline LED Supply

TDA4863 Power Factor Controller IC for High Power Factor and Low THD

The TDA4863 IC controls a boost converter in a way that sinusoidal current is taken from the single phase line supply and stabilized DC voltage is available at the output. This active harmonic filter limits the harmonic currents resulting from the capacitor pulsed charge currents during rectification. The power factor which describes the ratio between active and apparent power is almost one. Line voltage fluctuations can be compensated very efficiently.

TDA4863主要特性：

? IC for sinusoidal line-current consumption

? Power factor achieves nearly 1

? Controls boost converter as active harmonic filter for low THD

? Start up with low current consumption

? Zero current detector for discontinuous operation mode

? Output overvoltage protection

? Output undervoltage lockout

? Internal start up timer

? Totem pole output with active shut down

? Internal leading edge blanking LEB

? Pb-free lead plating; RoHS compliant

图1。TDA4863方框图

图2。TDA4863应用电路图：Pout = 110 W, 通用输入Vin = 90 - 270 V AC

EVALLED-TDA4863G-40W评估板

The EVALLED-TDA4863G-40W is a demoboard to demonstrate the concept of a single stage PFC+Flyback converter using the TDA4863G and the CC-CV control chip TLE4305G in a LED driving application.

EVALLED-TDA4863G-40W评估板主要特性：

? High Efficiency of ~90%

? High Power Factor up tp 0.98 and low THD

? Low System BOM, trough Single Stage Concept

? +/- 2% Accuracy Constant-Current Constant-Voltage Regulation

? Cycle-By-Cycle Peak Current Limitation

? Low In-Rush Current

? VCC Over and Under-Voltage Protection




图3。EVALLED-TDA4863G-40W评估板外形图

图4。EVALLED-TDA4863G-40W评估板基本电路图

图5。EVALLED-TDA4863G-40W评估板电路图
EVALLED-TDA4863G-40W评估板材料清单（BOM）：


图6。EVALLED-TDA4863G-40W评估板变压器电路图

来源：中电网