Power supply frontend DPH5005-USB 50V/15A, charts



This is all the charts without many comments, for the review see here.

Contents
    Load sweep
    Load Test
    Voltage sweep
    Voltage sweep, no load
    Voltage sweep, output shorted
    On/off charts
    Noise charts


Load sweep

The first voltage is input voltage, the second voltage is output voltage.



Fan starts at 3.5A.










The fan is also temperature controlled, here it starts at 2.5V.















































Load Test

These test are done with fixed input voltage, fixed output voltage and constant current. The purpose is to see if the output stays stable when the power supply warms up and also to see if the supply can maintain the current.



The first load test is with the buck converting, input voltage is 50V.



M1: 51.9°C, M2: 47.3°C, HS1: 58.1°C



M1: 52.3°C, M2: 48.7°C, HS1: 57.9°C



Second test is with boost converting at full power, input voltage is 25V.



M1: 69.3°C, HS1: 87.5°C



M1: 64.7°C, M2: 60.9°C, HS1: 77.1°C

Here the output is nearly 250W with a power loss of about 17W, this means a efficiency about 93%



Voltage sweep

These test are done with constant output voltage and output current. The input voltage is varied to see how the efficiency varies and how low input voltage it can handle.
Each test includes two charts: one with input current and one with output voltage and power loss/efficiency





































































Voltage sweep, no load

Same as above, just without any output current.






Voltage sweep, output shorted

This power supply has a constant current mode, these charts show how it works at different input voltage. Output is nearly shorted.









On/off charts

How do the output behave during on/off transitions. I test 3 situations: Input power to supply on/off, using the on/off button on the supply, connecting/disconnecting the load. The load is a IT8512+.



When power is connected a small transient occurs on the output.



Later on the load turn on normally (If auto on is enabled).



The transient varies very little with output voltage.



Output voltage drops very slowly when power is removed from the supply.













The ouptut voltage drops significantly and then recovers when turning full load on.










Noise charts

Noise is measured with a oscilloscope connected to the output, I use an electronic load for drawing current.