ZXLD1370是60V高精度降压/升压/升降压LED驱动控制器,输出电流精度0.5%,工作电压6V-60V,DC调光比20:1,500Hz的调光比达1000:1,工作频率高达1MHz,可驱动超过15个串联的LED.本文介绍了ZXLD1370主要特性, 降压配置框图, 升压/升降压配置框图, OVP保护电路,和2.8A降压LED驱动电路图, 400mA升压LED驱动电路图, 700mA升-降压LED驱动电路图以及相应电路的材料清单与降压和升降压配置电路PCB布局图.
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
图1.ZXLD1370降压配置框图
图2.ZXLD1370升压/升降压配置框图
图3.ZXLD1370采用热敏电阻和Tadj降压-升压配置框图
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