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,
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.