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The XL4015 5A Step Down Adjustable Power Supply with LED Voltmeter module is a 180 kHz fixed frequency PWM buck (step-down) DC/DC module, capable of driving a 5A load with high efficiency, low ripple, and excellent line and load regulation. The module has a voltmeter display to show the current input and output voltages. It can also be calibrated for accuracy. The voltmeter can calibrate automatically. The measure can be changed between input and output voltage, with the indicator. The voltmeter can also be shut down. The board uses the connection terminal for easy wiring. The DC/DC buck module has applications where the input voltage is higher than the output voltage, such as battery, power transformer, DIY adjustable regulated power supply, LCD Monitor and LCD TV portable instrument power supply telecom/networking equipment, 24V vehicle notebook power supply, industrial equipment buck. This module has an adjustable output Voltage and Current. It also works as a dedicated charger for Lithium Batteries (Li-Ion, LiPo) as it is capable of controlling voltage as well as current. Ex. 12V buck to 3.3V, 12V buck to 5V, 24V buck to 5V,24V buck to 12V, 36V buck to 24V, etc. Features : Better than 2596, easy to 4A 50W, up to 75W adding the heat sink. Power indicator: Yes. Short circuit protection: Yes (limit current 8A). Over-temperature protection: Yes (shutdown output automatically after over temperature). Input Reverse Polarity Protection: None (cascade high current diode if required). Wiring: IN+/- Input, OUT+/- Output. Built-in current limit function.