Adjustable 5A DC-DC Power Module

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    Description

    This is a super handy switching buck converter with an integrated display for voltage, current, and efficiency. With the 4 digits 7-segment display, you can adjust the output voltage and current easily without a multimeter. The constant voltage (output) and maximum current (output) can be adjusted via an onboard multi-turn potentiometer.

    Note: The USB port output voltage is the same as the module output voltage, it is NOT fixed at 5V, please adjust the output voltage accordingly if you need to use it to power up USB devices.

    Example applications:

    • Step down voltage from Solar panel to Li-po or Li-ion battery charging circuit (Normally is 4.5V to 6.0V)
    • Step down switching regulator with current limits to protect your load or power source
    • Constant current regulator for LED driver.
    • Lithium-based battery charger.

    The module comes with several LED indicators:

    • IN LED, to indicate the presence of Input voltage
    • OUT LED, to indicate the presence of output voltage
    • CC/CV: Red color LED, light-up means constant current mode
    • CHARGE, to indicate charging in process
    • FULL, to indicate the battery is full
    Warranty Period: 12 months
    Features
    • Supported input voltage: 5V to 36VDC
    • Support output voltage: 1.25V to 32VDC. Again, this is a step-down converter, the input voltage should be higher than the output voltage.
    • Output current: Adjustable, maximum is 5A, but practically is 4.2A.
    • Maximum output power: 75W, but recommend at 50W because higher output power decrease the efficiency
    • Operating temperature: -40 degree C to +85 degree C
    • Switching frequency: 180KHz
    • Efficiency: 96%
    • Output short circuit protection: Yes
    • Over-temperature protection: Yes, the output will be shut down when the temperature is over the safe level.
    • Reverse Polarity Protection at Vin: NO
    • Dimension: 68.2mm x 38.8mm x 15mm
    • Weight: 35gram

     

    Guides:

    As a Normal step down regulator with a current limit

    • Do not connect any load, press the push button on right (under OUT LED), until you see the last digit of the 7 segment display "U" which represents "V", and the OUT LED lights up.
    • Use a flat screwdriver to adjust the CV (Constant Voltage) multiturn potentiometer (clockwise to increase output voltage and vice versa), the value on the 7-segment display will vary accordingly.
    • Now, press the push button on right (under OUT LED) until you see the last digit of the 7-segment display "A" which represents "Ampere".
    • Short the output terminal (terminal block) with a wire, YES, short it!
    • Now the 7 segments will display the output current, adjust the CC (Constant Current) multiturn potentiometer (clockwise to increase maximum output current), the value on 7-segment will vary accordingly.
    • Now, disconnect the short wire, and connect it to your load.

    Notes:

    • Do not short circuit the output terminal for too long when adjusting the constant current! 
    • Use thicker wire (instead of jumper wire) when short-circuiting the output terminal!
    • Only connect load when voltage and current are already adjusted to rated load current and voltage.

    Lithium base charger:

    • A battery charger must have the current limit feature to charge a battery. The reason is that when a battery is depleted, the voltage different from charger and battery is huge and this battery will draw a lot of currents, but high current will eventually damage the battery. 
    • 1st, determine the battery charging voltage and charging current. For example, Cytron single-cell Li-po, 3.7V, 1300mAh, with recommended charging current of 0.5C (Maximum charging current is at 1C which is 1300mA)
    • DO NOT Connect any load, press the push button on right (under OUT LED), until you see the last digit of 7 segment display "U" which represent "V", and the OUT LED is light up.
    • Use a flat screwdriver to adjust the CV (Constant Voltage) multiturn potentiometer (clockwise to increase output voltage), until the 7-segment display "4.20U".
    • Now, press the push button on right (under OUT LED) until you see the last digit of the 7-segment display "A" which represents "Ampere".
    • Short the output terminal (terminal block) with a wire, YES, short it!
    • Now the 7 segments will display the output current, adjust the CC (Constant Current) multiturn potentiometer (clockwise to increase maximum output current), until 0.65A (0.5C of 1300mA).
    • Now, disconnect the short wire, and connect to the Lipo battery, MAKE SURE the polarity of the battery is correct.
    • The CHARGE LED (BLUE) and CC LED (RED) will light ON to indicate the charging is in progress.
    • Initially, the charging happens in constant current mode, but gradually current will reduce (CC LED will OFF) until constant voltage.
    • When the current is 0.1 of constant current, the CHARGE LED will be off and the FULL LED (GREEN) will light ON.

    As constant current LED driver:

    • 1st, determine the LED driving current and operating voltage.
    • With the no-load condition, press the push button on right (under OUT LED), until you see the last digit of the 7 segment display "U" which represents "V", and the OUT LED lights up.
    • Use a flat screwdriver to adjust the CV (Constant Voltage) multiturn potentiometer (clockwise to increase output voltage), until the 7-segment displays the LED operating voltage.
    • Now, press the push button on right (under OUT LED) until you see the last digit of the 7-segment display "A" which represents "Ampere".
    • Short the output terminal (terminal block) with a wire, YES, short it!
    • Now the 7 segments will display the output current, adjust the CC (Constant Current) multiturn potentiometer (clockwise to increase maximum output current) to the driving current of the LED.
    • Now, disconnect the short wire, and connect to the LED.
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