Adjustable 5A DC-DC Power Module

Adjustable 5A DC-DC Power Module

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This is super handy switching buck converter with integrated display for voltage, current and efficiency. With the 4 digit 7-segment display, you can adjust the output voltage and current easily with out multimeter. The constant voltage (output) and maximum current (output) can be adjusted via on board 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 present of Input voltage
  • OUT LED, to indicate the present of output voltage
  • CC/CV: Red color LED, light up means constant current mode
  • CHARGE, to indicate charging in process
  • FULL, to indicate battery is full

Features:

  • Supported input voltage: 5V to 36VDC
  • Support output voltage: 1.25V to 32VDC. Again, this is step down voltage, input voltage should be higher than 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 shutdown 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 Normal step down regulator with current limit

  • 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 and vice versa), the value on 7-segment display will vary accordingly.
  • Now, press the push button on right (under OUT LED) until you see the last digit of 7-segment display "A" which represent "Ampere".
  • Short the output terminal (terminal block) with a wire, YES, short it!
  • Now the 7 segment 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 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 is already adjusted to rated load current and voltage.

Lithium base charger:

  • A battery charger must have current limit feature to charge battery. The reason is because when a battery is depleted, the voltage different from charger and battery is huge and this battery will draw a lot of current, but high current will eventually damage the battery. 
  • 1st, determine the battery charging voltage and charging current. 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 7-segment display "A" which represent "Ampere".
  • Short the output terminal (terminal block) with a wire, YES, short it!
  • Now the 7 segment 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 happen 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 off and FULL LED (GREEN) will light ON.

As constant current LED driver:

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

Resources:

Can the output voltage and current support raspberry pi 3B+ ? ( Tan, 28/10/2019 )
Hi, we're sorry it doesn't support. Thanks :)
what i put input voltage 24v but behind ic component fast heat hot ( donny, 30/05/2019 )
Not answered yet.
whats the difference between Ci and Cv? and why i cant lower the output voltage? ( ming, 04/04/2019 )
Hi,

CI - to adjust max current
Cv - to adjust max voltage

If you can't adjust them please email to support@cytron.io, We will help you with warranty.

Thanks.
Hi, on the current limit adjustment, how long can you short the output? turning the potentiometer doesnt seem to work, its always at 5A. ( User1, 30/06/2018 )
Hi, please email to support@cytron.io for more details :) 
Hi, is this dc-dc setup the same with module DC-DC-SU-5A?
( User, 25/04/2018 )
Hi, the main different is DC-DC-SU-5A = step up, while this module DC-DC-SD-5A = step down. Thanks.
what is the minimum current of the power supply for the input of the converter to work? because i use a 10W, 18V and 0.5A solar panel as my input power, when i short the output to adjust my current, the display does not show anything, but when i connect higher current supply then is okay. ( Augustine, 15/04/2018 )
Hi, even the solar spec is 10W, 18V and 0.5A, if no optimum light received by the solar, the output will lower than the spec (<0.5A). We don't have the spec min current for this device, anyway we advise to have the input power with minimum 1A. For further questions, please visit to our technical forum for similar question or post your question there, as this session is only for short inquiry. Thanks.
HI, when will you restock? ( Ismaiil Hossen, 22/10/2017 )
Hi, we will restock in 2-3 week. You may click on notify me button and we will inform you once we have stock :)
Where should i put on the heat sink?on the back? I have short circuit it and only the backside chipset raising temperature. ( WeiHeng , 15/06/2017 )
Hi, you can put the heatsink at the top of the regulator component (in between capacitor and inductor). Thanks.
Hi, can you share the schematic?

Thanks
( zulfadli, 17/05/2017 )
Hi, Sorry the supplier does not provide the schematic to us.

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