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        TI TPS92070低功耗離線LED照明解決方案

        作者: 時間:2012-04-19 來源:網絡 收藏

        公司的92070是用在低功耗離線照明的高檔PWM控制器,集成的調光接口具有非消耗調光觸發控制電路.電流調整優于5%,可編程最低電流,谷底開關和DCM操作降低EMI和提高了效率,功率因素大于0.8,逐個周期的限流保護,主要用在LED燈,LED光源,LED聚光燈和LED投光燈.本文介紹了92070主要特性,方框圖, 應用電路圖以及230VAC輸入92070EVM-648調光LED照明驅動器主要指標,電路圖和材料清單.

        本文引用地址:http://www.104case.com/article/200474.htm

        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 nondissipative 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應用:

        LED Light Bulb Replacement

        LED Luminaires

        LED Downlights

        LED Wall Washers

        www.21ic.com中國電子網
        圖1. TPS92070方框圖


        圖2. TPS92070應用電路圖

        230VAC輸入TPS92070EVM-648調光LED照明驅動器

        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調光LED照明驅動器主要特性:

        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調光LED照明驅動器應用:

        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調光LED照明驅動器主要指標:


        圖3.TPS92070EVM-648調光LED照明驅動器電路圖

        TPS92070EVM-648調光LED照明驅動器材料清單:


        圖4.TPS92070EVM-648調光LED照明驅動器外形圖



        關鍵詞: LED TPS TI

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