Diode公司的ZXLD1370是60V高精度降壓/升壓/升降壓LED驅動控制器,輸出電流精度0.5%,工作電壓6V-60V,DC調光比20:1,500Hz的調光比達1000:1,工作頻率高達1MHz,可驅動超過15個串聯的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驅動電路圖, 400mA升壓LED驅動電路圖, 700mA升-降壓LED驅動電路圖以及相應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


圖1.ZXLD1370降壓配置框圖

圖2.ZXLD1370升壓/升降壓配置框圖

圖3.ZXLD1370采用熱敏電阻和Tadj降壓-升壓配置框圖
圖4.ZXLD1370 OVP保護電路

圖5.ZXLD1370降壓和升降壓配置電路布局圖

圖6.ZXLD1370 2.8A降壓LED驅動電路圖

2.8A降壓LED驅動電路材料清單:


圖7.ZXLD1370 400mA升壓LED驅動電路圖
400mA升壓LED驅動電路材料清單:


圖8.ZXLD1370 700mA升-降壓LED驅動電路圖

700mA升-降壓LED驅動電路材料清單