Buck Converter

Characterization

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Goal: Make sure efuses are soldered properly & Test efuses over current protection and short circuit protections

Pre-test:

1. See if you can Try to borrow an eload from Rover or Midnight Sun,

   1. if you can’t borrow an the eload, make your own eload. Find the XT60 connector with around 10 resistors soldered together, it should have resistance labelled on it, around 1.67 ohm if I recall correctly. It is in a yellow connector organizer kit.

2. Set up eload if you can borrow one

3. Set up current probe on the scope scope

   1. Vin channel

   2. Vout channel

   3. Iout channel, for this you need a current probe and it needs a 9V alkaline battery (Rockery has 9V battery if we don’t have any battery left)

4. Lift R1 to disable buck

5. Solder a wire at C15, connect power supply here to inject 6V

6. For each efuse,

   1. Solder 2 wires at output, use one wire for load and another wire to measure Vout;

   2. Solder 1 wire at input to measure Vin

7. Solder multiple ground wires

Test plan:

Check

• No shorts caused by soldering rework on the PCB

• Vout is 6V

• Current Probe is working

Over Current Test

1. Connect load

2. Set Oscilloscope to Normal, trigger around 0.1 - 0.3A, we want to see the efuse retrying

3. Turn on power supply

4. Take a photo of Oscilloscope screen

5. Repeat for all efuses

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