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关键词:电源管理 LED驱动器 LED照明 AL1672

时间:2018-06-11 10:44:30       作者:Diodes       来源:中电网

Diodes公司的AL1672是高性能单级降压转换器,工作在BCM模式,具有良好的EMI和效率,支持多种调光模式.器件集成了600V/4A高压MOSFET和多种保护模式如过压,短路,过流和超温等,主要用在具有调光功能的通用LED照明驱动器,通用恒流源和智能LED照明.本文介绍了AL1672主要特性,框图,降压应用电路图以及100~265VAC高PF降压LED驱动器演示板主要特性和指标,电路图和变压器电路图,材料清单和PCB设计图.

The AL1672 is a high performance single stage Buck convertor, targeting dimmable LED lighting application. It is operating at BCM mode which results in good EMI and efficiency.

The AL1672 can supice will operate in analog dimming mode. When a digital signal is applied on APWM pin, the device works at PWM dimming mode.

The AL1672 features low start-up current and low operation current. It integrates multiple protections including over voltage, short circuit, over current and over temperature protection. It also integrates 600V/4A high voltage MOSFET. The AL1672 is available in SO-8EP package.

AL1672主要特性:

 Valley Switching for Low Switching Loss
 Low Start-Up Current
 High PF and Low THD
 High Efficiency
 Tight LED Current Variation Range
 Tight Output Open Voltage Variation Range
 Integrates 600V/4A MOSFET
 Support Both PWM Dimming and Analog Dimming
 PWM Dimming Range:3% to 100% at 1kHz PWM Frequency
 Analog Dimming and PWM-to-DC Dimming Range:18% to 100%
 Internal Protections
 Under Voltage Lock Out (UVLO)
 Output Over Voltage Protection (OVP)
 Output Short Protection (OSP)
 Over Current Protection (OCP)
 Thermal Fold-Back Protection (TFP)
 Over Temperature Protection (OTP)
 Low System Cost
 Package: SO-8EP
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

AL1672应用:

 General LED Lighting Driver with Dimming Function
 General Purpose Constant Current Source
 Smart LED Lighting

图1.AL1672框图


图2. AL1672降压应用电路图

100~265VAC高PF降压LED驱动器演示板

This demonstration board utilizes the AL1672 Buck LED driver IC providing a cost effective PWM/Analog dimmable solution for offline high brightness LED applications. This user-friendly evaluation board provides users with quick connection to their different types of LED strings. The demonstration board can be modified to adjust the LED output current and the number of series connected LEDs that are driven.

A BOM, schematic and layout are included that describes the parts used on this demonstration board, along with measured performance characteristics. These materials can be used as a reference design.

LED驱动器演示板主要特性:

 PWM/Analog Dimmable
 High efficiency >90%
 Non-isolated buck LED driver

LED驱动器演示板指标:



LED驱动器演示板应用:

 Retrofit LED Lamps
 High Voltage DC-DC LED Driver
 General Purpose Constant Current Source


图3.LED驱动器演示板外形图


图4. LED驱动器演示板电路图

图5. LED驱动器演示板变压器电路
LED驱动器演示板材料清单:


图6. LED驱动器演示板PCB设计图(顶层)

图7. LED驱动器演示板PCB设计图(底层)
详情请见:
https://www.diodes.com/assets/Datasheets/AL1672.pdf
https://www.diodes.com/assets/Evaluation-Boards/AL1672EV1-User-Guide.pdf
AL1672EV1-User-Guide.pdf
AL1672.pdf

 

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