降压型直流电源变换器芯片(常规型),3A 150KHz 40V Buck DC to DC Conve,JTML1507

Datasheet 3A 150KHz 40V Buck DC to DC Converter                                XL1507 Rev 2.0                                                                                  ide 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 e fficiency „ 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 „ Digital Photo Frame „ Set-up Box „ ADSL Modem „ Telecom / Networking Equipment 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.    
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