5A ADJUSTABLE STEP-DOWN CHARGE MODULE WITH CURRENT VOLTMETER

The 5A Adjustable Step Down CC / CV Module provides output voltage and current limit adjustment in a compact module with built-in display. This compact DC-DC module is an adjustable XL4015 based voltage step-down (buck) converter module with the addition of a current limiting adjustment and a daughter board that provides a display of the output voltage and current.  This makes it convenient to use for a number of different applications such as for charging batteries, using as a constant current LED driver or serving as a small adjustable power supply with current limiting.

The module is rated for an input of 5V – 30V with an output voltage of 0.8V – 29V at up to 5A.  The module runs very comfortably at 1.5A and should be limited to around 3A unless some air flow is provided through the module to help keep things cool.

• • Built-in display of output voltage and current
  • Output voltage adjustment and Output current limit adjustment
  • Output current up to 5A with cooling and 3A without cooling
  • Input voltage range 5 to 30V and Output voltage range 0.8 to 29V
  • High efficiency: The module uses chips with high efficiency up to 95%, and can go to 5A current.
  • The voltage difference between input and output is 1V, with a minimum output voltage of 0.8v.
  • This module is an adjustable step-down module. The output voltage can be changed by adjusting the blue adjustable resistor on the module.
  • Module above marked IN-(input negative), IN+(input positive), OUT-(output negative), OUT+(output positive) must be correctly connected, otherwise it may lead to module damage.

Output Display:

• • The display shows the output voltage on the top display in the format XX.XU.  The right most digit displays a ‘U’ to represent Voltage.
  • The bottom display shows the output current in the format X.XXA.  The rightmost digit is an ‘A’ to represent Amps.
  • There are two on-board multi-turn pots for adjusting output voltage and setting current limiting.

Output Voltage Adjustment:

• • The potentiometer towards the middle of the module is used for adjusting the output voltage which is shown on the top LED display.
  • Turning the pot CW increases the the output voltage, turning it CCW decreases the output voltage.  The maximum output voltage will be about 1V less than the input voltage.  The minimum output voltage will be about 0.8V.
  • The output voltage can be set before a load is connected.

Current Limit Adjustment:

• • The other pot is for adjusting the current limit set-point.   The current being drawn is shown on the bottom LED display.
  • Turning the pot CW increases the current limit (amount of current the module will supply) while turning it CCW decreases the current limit.
  • If current is being limited by the module, the red LED on the side of the module with the adjustment pots comes on.

Status LEDs:

• • There are 2 additional LED status indicators on the side opposite the adjustment pots.
  • The LED on the left comes on to indicate that charging is occurring if the module is being used to charge a battery.
  • The LED on the right comes on to indicate that charging is complete as the current being drawn from the module is reduced toward zero.  It switches the LEDs between the two states when the current reaches approximately 10% of the current limit setting.

Applications:

• • High-power LED driver.
  • Lithium battery(or lead accumulator) charge.
  • Vehicle-mounted power supply.
  • Low voltage system power supply.
  • 6V, 12V, 14V, 24V battery charge.
  • On-board laptop power supply.
  • Regulated power supply.
  • Low voltage power supply system.