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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.
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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:
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Efuse U3:
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Efuse U2 :
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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.