Single Servo Driver Test Plan

Verify no connector pins look soldered together

Verify no pins on STM32 look shorted

Verify all components for Flight 5.7V Variant are fitted

Solder on radial capacitor for input buck

Solder on test input leads for buck testing

Verify pin 1 on chips aligns with indicator

Apply a few plug/unplug cycles on connectors to test solder joint quality

Make sure no power rails are shorted to ground or each other with DMM

Slowly increase voltage (with low current limit, 100mA max) on buck input, check its not drawing excessive current/power (ensure no output load)

Probe the output net for voltage stability with DMM

Slowly increase voltage on internal 5V rail and verify the internal 3.3V rail turns on (LDO functionality)

Perform a load test on buck converter: use an e-load to fully saturate the buck and verify you get the output current expected (up to 1A)

Step the load and perform efficiency calculations: 12V, 24V, 50V

Load transient testing: Step the e-load and view the transient response from buck converter output.

Battery inrush test: simulate hot-plugging a battery on the input terminal and view transient voltage spike/oscillations.

Then, handoff to firmware for testing.