TI TPS61165 多个高亮LED解决方案
TI 公司的TPS61165时能管理多个高亮度LED的升压DC/DC转换器，集成了40V, 1.2A的电流开关，工作在1.2MHz固定开关频率，输入电压3伏到18伏，输出电压可高达38伏，可支持多达3个大功率LED。本文介绍了TPS61165的主要性能特性，典型应用以及其它多种应用电路图, TPS61165EVM-283评估模块电路图和材料清单。TI BOOST CONVERTER MANAGES MULTIPLE HIGH-BRIGHTNESS LEDS
DC/DC Converter with Integrated 40-V, 1.2-A Current Switch Supports Up to Three High-Power LEDs
With a 40-V rated integrated switch FET, the TPS61165 is a boost converter that drives up to 10 LEDs in series. The boost converter runs at a 1.2-MHz fixed switching frequency with 1.2-A switch current limit, and allows for the use of a high brightness LED in general lighting.
The default white LED current is set with the external sensor resistor Rset, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, the LED current can be controlled using the 1 wire digital interface (Easyscale protocol) through the CTRL pin. Alternatively, a pulse width modulation (PWM) signal can be applied to the CTRL pin through which the duty cycle determines the feedback reference voltage. In either digital or PWM mode, the TPS61165 does not burst the LED current; therefore, it does not generate audible noises on the output capacitor. For maximum protection, the device features integrated open LED protection that disables the TPS61165 to prevent the output from exceeding the absolute maximum ratings during open LED conditions.
The TPS61165 is available in a space-saving, 2mm × 2mm QFN package with thermal pad.
主要特性：
3-V to 18-V Input Voltage Range
38-V Open LED Protection for 10 LEDs
200-mV Reference Voltage With 2% Accuracy
1.2-A Switch FET With 1.2-MHz Switching Frequency
Flexible 1 Wire Digital and PWM Brightness Control
Built-in Soft Start
Up to 90% Efficiency
2mm × 2mm × 0.8mm 6-pin QFN Package With Thermal Pad
应用：
High Brightness LED Lighting
White LED Backlighting for Media Form Factor Display
图1。TPS61165功能方框图
图2。TPS61165典型应用
其它的应用还有：
图3。带外接PWM 调光网络驱动3个高亮LED电路图
图4。驱动 27个 LED的电路图
图5。驱动6个高亮LED电路图
图6。带SEPIC拓扑结构的驱动4个高亮LED电路图
The Texas Instruments TPS61165EVM-283 evaluation module contains a TPS61165 IC, supporting active and passive components and three white light-emitting diodes (WLEDs) in series. The goal of this EVM is to facilitate evaluation of the TPS61165 in a typical WLED application.
图7.TPS61165EVM-283评估模块电路图
HPA283 材料清单(BOM):
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