Buck converter:

Open

Vin = 50V, Iout = 1A

Open

Vin = 50V, Iout = 2A

Set up: Oscilloscope AC coupled, 1GHz bandwidh

The video below is testing the over current protection feature of the buck chip only, the PCB only has the buck circuit assembled at this point. The e-fuse chips and pwm buffer are not populated at this point yet.

Efuses

Setup:

With 47 Omhs connected, For U4, U3, U2 Measured Vout on board to be roughly 5.95V, U5 was roughly 0V

Over Current Test. Used 8, 10Omh Resistors in parallel, R_L = 1.25Omh, Current Loaded (ideal) = 4.8A

With 1.25Omhs connected For U4, U3, U2 Measured with DMM Vout on board to be 1.9V and steady decline till 1.3V, U5 was roughly 0V

EFuse U5: (At 4.8A Unresponsive)

EFuse U4 (4.8A):

EFuse U3 (4.8A):

EFuse U2 (4.8A):

Short-to-ground Test

EFuse U5: (Taken on Different Day)

Efuse U4:

Efuse U3:

Efuse U2 :

Battery Inrush Test

Used 8, 10Omh Resistors in parallel, R_L = 1.25Omh, Current Loaded (ideal) = 4.8A

Channel 1 is Iout, Channel 2 is Vin after the filter, Channel 3 is Vout of the U2 efuse.

Compared to using 22K Resistor, Ideal current 0.27mA

Channel 1 is Iout, Channel 2 is Vin after the filter, Channel 3 is Vout of the U2 efuse.

Vout should increase to 6V to match the load. It’s a bit strange that there is no change once power ris connected.

PWM buffer