This continuously adjustable DC-DC step-down (buck) converter module converts an 8V  to 35V DC input to any output voltage in the range of 3V to 24V DC output at up to 5A current (15W maximum). The output voltage is adjusted with a multi-turn potentiometer on the bottom of the module. 

Specifications:

• Input rated voltage: 12V & 24V
• Input voltage range: 8-35V
• Efficiency: 93% (half load), 91% (full load)
• Output voltage: 3-24V adjustable (minimum input-output voltage difference: 3V)
• Output voltage adjustment: Multi-turn potentiometer, bottom side
• Output current: 5A MAX
• Output rated power: 15W
• Output peak power: 18W
• Voltage regulation: <1%
• Load regulation: <2%
• Working temperature: -20C to +85C (If the ambient temperature exceeds 40C, power should be derated to maintain case temperature <85C, or enhance heat dissipation)
• Module Properties: Non-isolated step-down buck module
• Rectification: Synchronous rectification
• Waterproof rating: IP67
• Full load temperature rise: 45C
• Protection: Over-current, Over-temperature, Short-circuit protection,
• Auto-recovery when the device is back to normal operating parameters
• Input Reverse Polarity Protection: NONE (Please Series diode at the input port.)
• Weight: 40G (~1.5 oz)
• Size: 66 x 60 x 22mm (2.6 x 2.36 x 0.87 inches) L x W x H
• Input and output wire lengths: ~13cm (~5 inches)
• Output connector: Bare wire
• The red and black leads are the + and - inputs, the yellow and black leads are the + and - outputs

Operating Notes:

As with any DC-DC converter, the input DC power supply powering this converter must be capable of providing the maximum power drawn by your load. If the input supply is not capable of providing the power, the converter will fold back the output voltage as necessary. Example: If your load draws 3A at 5V (15W), and the input supply is only capable of providing 12V at 1A (12W), the maximum output voltage the converter will deliver is 4V (12W/3A).

• 1X 8-35V In 3-24V Out Adjustable 5A DC-DC Step Down Waterproof Converter