XL2009 高效率车充,降压.pdf

3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2 009 Features General Description n Wide 8V to 36V Input Voltage Range The XL2009 is a 180 KHz fixed frequency n Output Adjustable from 1.25V to 32V PWM buck (step-down) DC/DC converter, n Maximum Duty Cycle 100% capable of driving a 2.5A load with high n Minimum Drop Out 0.3V efficiency, low ripple and excellent line and n Fixed 180KHz Switching Frequency load regulation. Requiring a minimum n Maximum 3A Switching Current number of external components, the regulator n Internal Optimize Power MOSFET is simple to use and include internal n High efficiency frequency compensation and a n Excellent line and load regulation fixed-frequency oscillator. n With output constant current loop n Built in thermal shutdown function The PWM control circuit is able to adjust the n Built in current limit function duty ratio linearly from 0 to 100%. An over n Built in output short protection function current protection function is built inside. n Available in SOP8L package When short protection function happens, the operation frequency will be reduced from 180KHz to 48KHz. An internal compensation block is built in to minimize external Applications