TI TPS92510 集成LED热保护功能HBLED 1.5A降压照明参考设计方案
TI公司的TPS92510是一款集成高边MOSFET场效应管的60V，1.5A峰值电流型降压转换器，专为恒流高亮度LED照明设计的转换器。采用电流感应电阻器获得公差为200mV的内部参考电压以降低功耗。一个专用的脉冲宽度调制输入引脚线性控制输出亮度。该芯片内部集成了一个热监测功能，减少平均输出电流，确保LED温度不会超过特定设置阀值，提高了整个系统的可靠性。同时具有周期过流保护和热关断保护功能。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The TPS92510 is a 60-V, 1.5-A peak current-mode step-down converter with an integrated high-side MOSFET. It is specifically designed for driving high-brightness LEDs with a constant current. The tight-tolerance, 200-mV internal reference voltage reduces power dissipation in the current-sense resistor. A dedicated pulse width modulation input pin allows linear control of the light output.
The TPS92510 integrates a thermal foldback feature that reduces the average output current to ensure that the sensed LED temperature never exceeds a specific value, improving the reliability of the overall system. An integrated frequency synchronization feature allows a reduction of unwanted beat- frequencies in multi-string applications and simplifies EMI filtering. The adjustable input voltage UVLO feature accommodates the various deep discharge levels of multiple battery types.
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