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[原创] TI TPS92830-Q1三路大电流线性LED控制方案

关键词:电源管理 LED控制器 汽车照明 TPS92830-Q1

时间:2018-02-24 10:38:18       作者:TI       来源:中电网

TI公司的TPS92830-Q1是三路大电流线性LED控制器,器件集成了两级用于低压降工作的电荷泵.满足AEC-Q100规范,工作温度–40℃ 到125℃,输入电压从4.5V到40V, 20:1模拟调光,通过PWM输入和电源进行PWM调光,主要用在汽车前照明如位置灯,白天运营灯,前转向灯,近光灯以及汽车后照明如尾灯和停车灯,后转向灯,雾灯和倒车灯.本文介绍了TPS92830-Q1主要特性,框图和典型应用电路,以及评估板TPS92830-Q1 EVM主要特性,电路图和LED板电路图,以及材料清单和PCB设计图.

With the trend of better lighting homogeneity, highcurrentLEDs are often used in automotive front andrear lamps with lighting diffusers and light-guides.Meanwhile, in order to meet strict EMC and reliabilityrequirements, linear LED drivers are popular inautomotive applications. However, it is a challenge todeliver high current for linear LED drivers withintegrated power transistors. The TPS92830-Q1device is an advanced automotive-grade high-sideconstant-current linear LED controller for delivering high current using external N-channel MOSFETs. Thedevice has a full set of features for automotiveapplications and is compatible with a wide selectionof N-channel MOSFETs.

Each channel of the TPS92830-Q1 device sets thechannel current independently by the sense-resistorvalue. An internal precision constant-currentregulation loop senses the channel current by thevoltage across the sense resistor and controls thegate vol..

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