MSXV DCDC Validation

05-2023

  • During the test, the capacitor discharge circuit started smoking

  • Once working, DCDC output max is 10.6-10.7V

17-06-2023

  • R7: 549.5; R8: 4.715k; R9: 1k

    • So looks like R8 is off as it should be 10k

  • TR to HV GR it's only 3.511kohms (should be a little over 15kR)

6-2023

  • Replaced R8 to 10k ohms resistor, but seems like the resistor removed was 10k

  • Connected back to the power supply and load no change in output voltage

27-06-2023

  • mosfet gate and drain/source is not shorted

  • r8 is replaced with 10kohm resistor

30-06-2023

  • Testing the DCDC output with the replaced resistor (R8)

Test 1: Replaced resistor

  • CC (Load): 0.100A

  • Voltage (PSU): 60-100V

  • Power consumption: ~1.060W

  • Results:

    • no resistance across TR and HV GND

    • outputting ~10.6-10.8 volts from the range

Test 2: Removed R10

  • no resistance from TR to HV GND

  • Voltage output is slightly higher, around 10.7V at 60V input

Test 3: Replaced Q2

  • Same conditions: input voltage 60V

  • Same output voltage: ~10.7V

  • Suspected leg 2 of Q2 is not properly connected

    • when checking conductivity leg 1 & 3 were good

26-07-2023

  • removed R7, resistance from TR to GND is ~18.0k ohms

  • power supplied from 90-120V, outputs constant 12V

Input

Output

Input

Output

Voltage (V)

Current (A)

Voltage (V)

Current (A)

Power (W)

90.9

2.96

12.00

18.77

225.27

100.2

2.69

12.00

18.84

226.08

109.2

2.45

12.00

12.80

225.66

119.9

2.23

12.00

18.68

224.20