Power supply frontend DPS5020-USB 50V/15A, charts

DSC_1331

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.

Load%20sweep%206V%20out%204V

The input voltage was too low at 19A to maintain output. The fan starts at 10A

Load%20sweep%208V%20out%204V
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Load%20sweep%2024V%20out%204V
Load%20sweep%2030V%20out%204V
Load%20sweep%2040V%20out%204V

Here the fan starts before 10A, it looks like it also has a temperature sensor for fan control.

Load%20sweep%2050V%20out%204V
Load%20sweep%2060V%20out%204V


Load%20sweep%2012V%20out%209V
Load%20sweep%2024V%20out%209V
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Load%20sweep%2050V%20out%209V
Load%20sweep%2060V%20out%209V

Load%20sweep%2024V%20out%2015V
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Load%20sweep%2030V%20out%2025V
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Load%20sweep%2040V%20out%2035V
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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.

Load%20test%2019.5A%20out%2025V

Temp5877

M1: 63.0C, M2: 61.0C, M3: 64.4C, HS1: 73.9C

Temp5878

M1: 67.0C, HS1: 78.3C

Load%20test%2019.5A%20out%2050V

Temp5879

M1: 68.2C, M2: 67.3C, M3: 69.3C, M4: 71.5C, HS1: 99.1C

Temp5880

M1: 60.4C, HS1: 91.2C

Here the output is nearly 1000W with a power loss of about 20W, this means a efficiency just below 98%



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%20sweep%200.3A%20out%204V%20input%20current
Voltage%20sweep%200.3A%20out%204V
Voltage%20sweep%200.3A%20out%209V%20input%20current
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Voltage%20sweep%200.3A%20out%2015V
Voltage%20sweep%200.3A%20out%2025V%20input%20current
Voltage%20sweep%200.3A%20out%2025V
Voltage%20sweep%200.3A%20out%2035V%20input%20current
Voltage%20sweep%200.3A%20out%2035V
Voltage%20sweep%200.3A%20out%2050V%20input%20current
Voltage%20sweep%200.3A%20out%2050V


Voltage%20sweep%201A%20out%204V%20input%20current
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Voltage%20sweep%201A%20out%209V%20input%20current
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Voltage%20sweep%201A%20out%2015V
Voltage%20sweep%201A%20out%2025V%20input%20current
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Voltage%20sweep%201A%20out%2035V%20input%20current
Voltage%20sweep%201A%20out%2035V
Voltage%20sweep%201A%20out%2050V%20input%20current
Voltage%20sweep%201A%20out%2050V

Voltage%20sweep%205A%20out%204V%20input%20current
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Voltage%20sweep%205A%20out%209V%20input%20current
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Voltage%20sweep%205A%20out%2025V%20input%20current
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Voltage%20sweep%205A%20out%2035V%20input%20current
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Voltage%20sweep%2010A%20out%204V%20input%20current
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Voltage%20sweep%2010A%20out%2035V%20input%20current
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Voltage%20sweep%2019.5A%20out%204V%20input%20current
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Voltage%20sweep%2019.5A%20out%209V%20input%20current
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Voltage%20sweep%2019.5A%20out%2025V%20input%20current
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Voltage%20sweep%2019.5A%20out%2035V%20input%20current
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Voltage sweep, no load

Same as above, just without any output current.

No%20load%20voltage%20sweep%20out%204V
No%20load%20voltage%20sweep%20out%2035V



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.

Voltage%20sweep%20current%20out%200.3A
Voltage%20sweep%20current%20out%201A
Voltage%20sweep%20current%20out%205A
Voltage%20sweep%20current%20out%2010A
Voltage%20sweep%20current%20out%2020A



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+.

PowerOn60V15V0A
PowerOn60V40V0A

PowerOff60V15V0A
PowerOff60V40V0A

OutputOn60V15V0A
OutputOn60V15V19A
OutputOff60V15V0A
OutputOff60V15V19A


LoadOn60V15V19A
LoadOff60V15V19A



Noise charts

Noise is measured with a oscilloscope connected to the output, I use an electronic load for drawing the 19A.

Noise24V15V0A
Noise24V15V19A

Noise60V15V0A
Noise60V15V19A

Spectrum60V15V0A
Spectrum60V15V19A