原标题：TI TPS92070低功耗离线LED照明解决方案

　　TI公司的TPS92070是用在低功耗离线LED照明的高档PWM控制器, 集成的调光接口具有非消耗调光触发控制电路.LED电流调整优于5%,可编程最低LED电流,谷底开关和DCM操作降低EMI和提高了效率,功率因素大于 0.8,逐个周期的限流保护,主要用在LED灯,LED光源,LED聚光灯和LED投光灯.本文介绍了TPS92070主要特性,方框图, 应用电路图以及230VAC输入TPS92070EVM-648调光LED照明驱动器主要指标,电路图和材料清单.

　　The TPS92070 is an advanced PWM controller ideal for use in low-power, offline, LED lighting applications. The integrated dimming interface circuit of the TPS92070 features a non‐dissipative dimmer trigger control circuit. The TPS92070 controller provides DC LED current with no photometric ripple effects. The DC current also results in higher efficacy of the LEDs. The TPS92070 provides exponentially controlled light output based on the external dimmer position. High power factor is achieved with a valley fill circuit. Once a leading-edge dimmer is detected, the TPS92070 sets an output to disable the PFC circuit and thus optimizes driver operation. The LED current sense precision error amplifier implements deep dimming.

　　TPS92070主要特性:

　　Advanced Integrated Dimming Interface

　　Non-Dissipative TRIAC Dimmer Management

　　Lamp-to-Lamp Uniformity During Dimming

　　No Low-Frequency Photometric Ripple

　　Exponential Dimming Profile

　　Innovative Secondary-Side Feedback Eliminates Optocoupler Devices

　　LED Current Regulation better than 5%

　　Programmable Minimum LED Current

　　Valley Switching and DCM Operation for Reduced EMI and Improved Efficiency

　　Leading Edge Dimmer Detection

　　Power Factor > 0.8

　　Cycle-by-Cycle Current Limit Protection

　　Low Start-Up and Standby Currents

　　Integrated PWM MOSFET Driver

　　Thermal Shutdown

　　16-Pin, TSSOP package

　　TPS92070应用:

　　LED Light Bulb Replacement

　　LED Luminaires

　　LED Downlights

　　LED Wall Washers

　　图1. TPS92070方框图

　　图2. TPS92070应用电路图

　　230VAC输入TPS92070EVM-648调光LED照明驱动器

　　TPS92070EVM-648 Integrated Dimming LED Lighting Driver Converter for 230 VAC Input

　　The TPS92070EVM-648 evaluation module (EVM) is a low power isolated flyback converter that provides 5 on-board LEDs with 370 mA of drive current from a nominal 230 VAC input. This EVM is designed to demonstrate the TPS92070 in a typical application where LEDs can be used for general illumination applications that require dimming.

　　This evaluation module uses the TPS92070 High Efficiency Integrated Dimming LED Lighting Driver Controller in a low power offline flyback converter to provide 370 mA to the on-board LED load. The input accepts a nominal 50 Hz, 230 VAC input voltage. The TPS92070EVM-648 is designed to be used with a leading edge triac dimmer switch in series with the input voltage to control the lumen output of the LEDs. The integrated dimming interface circuit on the TPS92070 provides exponentially controlled light output based on the external dimmer position.

　　This user’s guide provides the schematic, component list, assembly drawing, and test set up necessary to evaluate the TPS92070 in an AC input LED lighting application. To use an input voltage greater than 240 VAC, it is recommended the user change the fuse to one rated for at least 300 V at 1 A.

　　TPS92070EVM-648调光LED照明驱动器主要特性:

　　The TPS92070EVM-648 features include:

　　• 180 VAC to 240 VAC input range

　　• LED current regulation of 370 mA, nominal

　　• 6 W output at 16.5 V

　　• Advanced integrated dimming interface

　　• Exponential dimming profile

　　• Programmable minimum LED Current

　　• Valley switching and DCM operation

　　• Leading edge dimmer detection

　　• Valley fill power factor correction

　　• Cycle by cycle current limit protection

　　TPS92070EVM-648调光LED照明驱动器应用:

　　The TPS92070 is suited for use in low power lighting applications such as:

　　• LED light bulb replacement

　　• LED luminaires

　　• LED down-lights

　　• LED wall washers

　　TPS92070EVM-648调光LED照明驱动器主要指标:

　　图3.TPS92070EVM-648调光LED照明驱动器电路图

　　TPS92070EVM-648调光LED照明驱动器材料清单: