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Tool/software:
Is there an issue with equations 5 and 6 in the datasheet for this IC? I cant seem to get values that make sense (peak current less than my desired output current). Am I doing this wrong? Or is there possibly another way to verify those two values before selecting an inductor? My values are seen below:
Thank you
Vout [V] | 5 |
Vin(max) [V] | 30.5 |
K_IND | 0.3 |
I_OUT [A] | 0.5 |
F_SW [Hz] | 500000 |
L_MIN [H] | 6.96721E-05 |
Hi,
The peak current should be higher, maybe there was a calculation mistake?
For 30Vin to 5Vout, the recommended inductor value is 68uH.
The saturation current should be a little higher than max current of device, 2A saturation should be sufficient.
Regards,
Rahil
Is this true even if im sizing the buck to output 500mA max for my needs? I dont need 1A of capacity. Those numbers I gave are what I used for calculating equations 4,5 and 6. I figured I could use a 68mH inductor, but sized for about 600mA, and saturation point could in turn be much lower than needed for 1A of capacity. Is this possible?
Hi,
Yes, we recommend sizing it based on the max Iout of the device not the application.
Regards,
Rahil