TOP 5A CC CV LED DRIVE LITHIUM CHARGER POWER STEP-DOWN MODULE W/ USB VOLTMETER HW514HC

TOP 5A CC CV LED DRIVE LITHIUM CHARGER POWER STEP-DOWN MODULE W/ USB VOLTMETER

Specifications

From the listing I knew it was a switch mode DC-DC power supply built around a buck converter. Also:

5-36VDC input range
1.25-32VDC output range, adjustable
0-5A output current, also adjustable, with output short protection
Max output of 75W with thermal shutdown
Up to 96% efficiency
A display that can be switched between showing: input voltage; output voltage, current and power.
The listing also included detailed application notes for use as a step-down, current limited power supply, a constant-current LED driver, and battery charger.