基于ZXLD1370設計的60V LED驅動方案
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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
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