Calculating inductance for boost converter - units

[newtekuser]

Watching Phil's Lab video on calculating the value for the inductor and want to know what units he used to get the 23uH value for the inductor.


Vout = 16V
Vin = 5V
Eff = 0.8
Fsw = 1.5MHz

First he uses the estimation formula for the inductor ripple current =  0.3 * Iout (max) * Vout/Vin = 96mA

Then he feeds the inductor ripple current into the inductance formula (Vin(Vout - Vin) ) / Vout * f * IL = 23uH

Does he express the 1.5MHz frequency as 1.5 and ripple current as 0.096

OR

1.5MHz frequency as 1.5 and ripple current as 96, then multiplies everything by 1000 ?

[newtekuser]

Answering my own question: the frequency value is in MHz and the current ripple is in Amps

so (5 * (16-5)) / 16 * 1.5 * 0.096 = 23uH

[Berni]

You are supposed to put everything into equations as base units. so the 1.5MHz should be 1500000 Hz and the result should be 0.000023 H

Just that since Mega is x1000000 and is on the bottom of the fraction so becomes /1000000 and Micro is /1000000 the units just happen to work out in a nice way, letting you work with numbers without a bunch of zeroes.

[Terry Bites]

I've used this handy tool. https://www.coilcraft.com/en-us/tools/dc-dc-optimizer/#/search
Give up on inches and farenheit.