TPS25910: Ic-load definition

Yasushi Fujiwara

Part Number: TPS25910

Hello Experts,

I would like to know definition of Ic-load in equation 11 of the datasheet. Ic-load is maximum load current, correct? If no, please correct me.
[condition]
Vin: 5V
Ic-load: 3A
C-load: 47uFx2

delta T= (47u*2*5)/3 = 156.667u
Cext = 11u * (156.667u /5) - 200p = 144.6674pF <= Is the calculation correct? If so, can I use 100pF for Cext?

Best Regards,
Fujiwara

over 3 years ago

0 Kunal Goel over 3 years ago

TI__Guru 60610 points

Hi Fujiwara,

Ic-load is the max current through output cap during startup. During startup the current will go through the cap and other load connected at output. So we have to ensure that total current during startup<5W/VIN. So if the load at efuse output during startup draws X current . Let us assume current through output cap to be Y then we have to ensure that X+Y<5W/VIN,X+Y<1A(in our case).

So for correct calculation, we have to know is there any other load another than capacitor at efuse output that will draw current during startup?

Regards

Kunal Goel

0 Kunal Goel over 3 years ago in reply to Kunal Goel

TI__Guru 60610 points

Hi Fujiwara,

Do you want to continue discussion on mail or here?

Regards

Kunal Goel

+1 Yasushi Fujiwara over 3 years ago in reply to Kunal Goel

TI__Genius 12505 points

Hi Kunal-san,

I would like to discuss on e-mail. I will close this thread.

Regards,
Fujiwara

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TPS25910: Ic-load definition