降压转换IC XL1507-12VE1 XL1507-3.3VE1

                        3A 150KHz 40V Buck DC to DC Converter--XL1507
General Description
      The XL1507 is a 150 KHz fixed frequency,PWM buck (step-down) DC/DC converter,capable of driving a 3A 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 enable function, an over current protection function is built inside. When second current limit function happens, the operation frequency will be reduced from 150KHz to 50KHz. An internal compensation block is built in to
minimize external component count.

Features
 Wide 4.5V to 40V Input Voltage Range
 3.3V,5V,12V, and adjustable versions
 Output Adjustable from 1.23V to 37V
 Maximum Duty Cycle 100%
 Minimum Drop Out 1.5V
 Fixed 150KHz Switching Frequency
 3A Constant Output Current Capability
 Internal Optimize Power Transistor
 High efficiency
 Excellent line and load regulation
 TTL shutdown capability
 ON/OFF pin with hysteresis function
 Built in thermal shutdown function
 Built in current limit function
 Built in second current limit function
 Available in TO-252 package
Applications
 LCD Monitor and LCD TV
 Di*al Photo Frame
 Set-up Box
 ADSL Modem
 Telecom / Networking Equipment