Buck converter:

Load regulation

Load transient

Vout ripple

Set up: Oscilloscope AC coupled, 1GHz bandwidh

Over current protection

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:

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

For U4, U3, U2 Measured Vout on board to be roughly 5.5V

EFuse U5: (At 4.8A Unresponsive)

EFuse U4 (4.8A):

EFuse U3 (4.8A):

EFuse U2 (4.8A):

Short-to-ground Test

EFuse U5: (Unresponsive)

Efuse U4:

Efuse U3:

Efuse U2 :

PWM buffer