DP50V5A DC numerical control regulated power supply is an adjustable step down module that integrates analog integration and numerical control. This module adopts STM32 single-chip microcomputer and the synchronous rectification IC as main control chip, which ensure the high efficiency of the module and raise/reduce the voltage instantaneously in case of no load. Using MOS anti-reversed connection protection circuit in the input not only protects the product but also effectively reduce the power consumption. What’s more, in order to reduce the output ripple and the interference to the power supply, the module adopts a 63V100UF solid capacitor and a 63V/470UF filter capacitor parallel connected in the input. In the output, it adopts a 50V/220UF solid capacitor and two 63V/470UF filter capacitors.

Facts speak louder than the words. The following is the test result of the output ripper and the accuracy , which is tested by professional equipment.

Firstly, we adjust the output voltage to 24V, then use oscilloscope to test the output ripper when the output is 24V0A. From the image, there is no high fluctuation.

When the output current is adjusted to 5A, the ripper become more intensive but no high fluctuation.

According to this testing result, the output ripper of the module is very low.

Here is the testing of the accuracy of the output voltage.

Firstly, adjust the output voltage to 0.07V, then we can see that the DC electronic load display 0.08V, which the error is small.

When the output voltage is adjusted to 23V:

The last but not the least, the following is the using experience shared by Tom Stiles. Great thanks for his sharing.

This device fits a need I have for a variable power supply. I have a number of fixed output power supplies that I used with my amateur radio equipment but needed a variable supply. First the physical format was just what I was looking for. It is small (4.2 x 2.7 x 2.4 inches) yet the display is large enough to easily read. The case has tabs on the side so that it can be mounted in a box or cabinet without having to use any mounting hardware. The connector are properly located so that connecting it up is very easy. It has a lot of options for setting the voltage output and current. Setting these parameters is quite easy and can be done quickly. There is a button to turn the output of this device ON or OFF. The input can vary from 6-55 Vdc and output of 0-50 Vdc. You can read the other parameters in the ad above. When the dc to dc converter is used to charge a battery or to be capacitive load, it must be in series with a diode, or the module will be damaged. A power diode is included in the kit for this purpose. Below are some of the measurements I recorded.

Input voltage = 18.8 Vdc

Load was a 10 ohm 1% 5 watt resistor

Test 1:

Output set to 9.10 Vdc at 1.0 Amps

Measured output: 9.07 Vdc at 0.887 Amps on device display and 9.01 Vdc on separate meter

Test 2:

Output set to 5.00 Vdc at 1.0 Amps

Measured output: 4.99 Vdc at 0.491 Amps on device display and 4.94 Vdc on separate meter

Test 3:

Output set to 2.50 Vdc at 1.0 Amps

Measured output: 2.49 Vdc at 0.243 Amps on device display and 2.48 Vdc on separate meter

Test 4:

Output set to 8.00 Vdc at 0.40 Amps (for contant current)

Measured output: 4.07 Vdc at 0.40 Amps on device display and 4.00 Vdc on separate meter

Test 5:

Output set to 8.00 Vdc at 0.50 Amps (for contant current)

Measured output: 5.08 Vdc at 0.50 Amps on device display and 5.01 Vdc on separate meter

Test 6:

Output set to 8.00 Vdc at 1.0 Amps (for contant current)

Measured output: 7.98 Vdc at 0.78 Amps on device display and 7.96 Vdc on separate meter

Note that the voltage and current can be adjusted to give the desired outputs more accurately.

I was very pleased with its performance.

——— Tom Stiles