Hello,
I've designed a boost controller for a backlight with this part number following the datasheet recommendations.
Vin = 3V (min), 3V3 (nominal), 4V (max)
Vout = 16V min, 19,8V max (backlight)
Io = 15mA
Fsw = 1,5MHz.
Efficiency = 90%.
The fact is that with the formula indicated in Equation 4 (page 12) and according to my converter specifications I get 70uH (ripple 30% assumption), approximately.
That's just the Ohm's Law.
This is a very big inductor value which simply does not matches the suggested inductor specified in the datasheet of 4,7uH to 10uH, page 12, as a rule of thumb.
Am I missing something? Any ideas about it? Shouldn't both match, should it?
Could you please describe in depth how do you get the value of the inductor in the example of the datasheet?
I just expected to get the inductor value which would satisfy this criteria.
Regards,