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VC905 20W升压恒流型LED驱动芯片

VC905 20W升压恒流型LED驱动芯片
  • 品牌VCSEMI
  • 型号VC905
  • 封装TO252-5

详细描述

Features 
„  Wide 3.6V to 32V Input Voltage Range ,
„  0.22V FB adjustable LED drive current ,
„  Directly drive 11 Series 1W LED at ,
VIN>=12V 
„  Fixed 180KHz Switching Frequency ,
„  Max. 4A Switching Current Capability ,
„  Up to 94% efficiency ,
„  Excellent line and load regulation ,
„  EN PIN TTL shutdown capability & With PWM Dimming Function  ,
„  Internal Optimize Power MOSFET ,
„  Built in Soft-Start Function ,
„  Built in Frequency Compensation ,
„  Built in Thermal Shutdown Function ,
„  Built in Current Limit Function ,
„  Available in TO252-5L package,
Applications
„  LED Lighting 
„  Boost constant current driver „  Monitor LED Backlighting „  7’ to 15’ LCD Panels  General Description 
The VC905 regulator is fixed frequency PWM Boost (step-up) LED constant current driver, capable of driving Series 1W/3W/5W LED units with excellent line and load regulation. The regulator is simple to use because it includes internal frequency compensation and a fixed-frequency oscillator so that it requires a minimum number of external components to work. The VC905 could directly drive 11 Series 1W LED units at VIN>12V . 
The PWM control circuit is able to adjust the duty ratio linearly from 0 to 95%. An enable function, an over current protection function is built inside. An internal compensation block is built in to minimize external component count. 

 


标签:  VC905 升压型恒流 LED驱动器
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