基于ZXLD1370設(shè)計的60V LED驅(qū)動方案

作者：時間：2010-06-09 來源：網(wǎng)絡(luò)

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ZXLD1370是60V高精度降壓/升壓/升降壓LED驅(qū)動控制器,輸出電流精度0.5%,工作電壓6V-60V,DC調(diào)光比20:1,500Hz的調(diào)光比達1000:1,工作頻率高達1MHz,可驅(qū)動超過15個串聯(lián)的LED.本文介紹了ZXLD1370主要特性, 降壓配置框圖, 升壓/升降壓配置框圖, OVP保護電路,和2.8A降壓LED驅(qū)動電路圖, 400mA升壓LED驅(qū)動電路圖, 700mA升-降壓LED驅(qū)動電路圖以及相應(yīng)電路的材料清單與降壓和升降壓配置電路PCB布局圖.

ZXLD1370:60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER

The ZXLD1370 is an LED driver controller IC for driving external MOSFETs to drive high current LEDs. It is a multitopology controller enabling it to efficiently control the current through series connected LEDs. The multi-topology enables it to operate in buck, boost and buck-boost configurations.

The 60V capability coupled with its multi-topology capability enables it to be used in a wide range of applications and drive in excess of 15 LEDs in series.

The ZXLD1370 is a modified hysteretic controller using a patent pending control scheme providing high output current accuracy in all three modes of operation. High accuracy dimming is achieved through DC control and high frequency PWM control.

The ZXLD1370 uses two pins for fault diagnosis. A flag output highlights a fault, while the multi-level status pin gives further information on the exact fault.

ZXLD1370主要特性:

0.5% typical output current accuracy

6 to 60V operating voltage range

LED driver supports Buck, Boost and Buck-boost configurations

Wide dynamic range dimming

o 20:1 DC dimming

o 1000:1 dimming range at 500Hz

Up to 1MHz switching

High temperature control of LED current using TADJ