The XL3003 is a 220 KHz fixed frequency PWM buck (step-down) LED constant current driver, capable of driving a 4A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator.
The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An over current protection function is built inside. When short protection function happens, the operation frequency will be reduced from 220KHz to 60KHz. An internal compensationblock is built in to minimize external component count.
Features of XL3003
●Wide 8V to 36V Input Voltage Range
●Output Current Sence Voltage is 0.21V
●Maximum Duty Cycle 100%
●Minimum Drop Out 0.3V
●Fixed 220KHz Switching Frequency
●4A Constant Output Current Capability
●Internal Optimize Power MOSFET
●Excellent line and load regulation
●Built in thermal shutdown function
●Built in current limit function
●Built in output short protection function
●Available in TO-252 package
Applications of XL3003
●Buck constant current driver of XL3003E1
●Monitor LED Backlighting
●General purpose LED lighting
Function Block of XL3003
Typical Application Circuit ofXL3003
Typical System Application (PWM DIMMING) of XL3003
PWM dimming function can be used in typical system application with external components. Changing the duty cycle of PWM signal can get different LED current. The PWM signal high voltage above 3.3V(referenced to ground, lower than VIN), Low voltage below 0.2V(referenced to ground).