Model A Specifications

• DC-DC non-isolated high voltage step-down power module
• Wide voltage input: 12V-120V (120V is the limit voltage, 100v DC max for long-term reliability)
• For the first use, it is recommended to connect a power supply of more than 30V;
• Adjustable output voltage: adjustable between 1.25V-48V
• Input and output voltage difference: 5V (ie output voltage < input voltage -5V)
• Output Current: 0.5A-1.5A (Max) varies by voltage input and output, see table
• Built-in soft start, over temperature, over current, & output short circuit protection
• Flicker-Free 110KHZ Switching Frequency 
• Operating temperature: Industrial grade (-40°C to +85°C)
• Board Dimensions: 1.73"x0.55" (4.4x2x1.4 cm)

Model B Specifications

• Wide voltage input: 12v-60v 
• Same as Model A

Instructions

1. First connect the connection line between the module and the power supply, and then turn on the power. Remember! Remember! (If the input terminal is live and wired, it is easy to spark, especially when the input power supply voltage is high, it will even burn the pads of the module).
2. For the first use, it is necessary to connect to a power supply of more than 30V; use a multimeter or a voltmeter to measure whether the output voltage of the module is consistent with the voltage required by the device.
3. The electrical equipment (load) is connected to the output end of the module.
4. When the difference between the input voltage and the output voltage is less than 5V, the output will be unstable or no output will occur.