Hi Team.
The customer is asking for data to calculate the output inductor for UCC2897.
I can see the formula to get the output inductor from SLUA535(4.1.1 Output Inductor).
I recalculated it according to the specification of the customer as follows.
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Condition -> Vin = 48V / Vout = 12V / Iout = 2A / Transformer Ratio = 7:4 (Pri : Sec)
Calculation result --> Lo = (12/ (0.15 * 2 * 225 * 10^3)) * (1 - 0.438 ) = 100uH
Is the result the minimum inductance value?
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---- Additional question -------
To verify the output inductor value, we compared it with PMP20878.
The conditions of PMP20878 are as follows:
Vin = 40~57V / Vout = 24V / Iout = 3A / Transformer Ratio = 1:1 (Pri : Sec)
Calculation result --> Lo = (24 / (0.15 * 3 * 225 * 10^3)) * (1 - 0.421 ) = 137uH
The schematic of the PMP20878 has a 33uF output inductor.
For some reason, did you use an inductance lower than the calculated value?
Does not problem to use a lower value than the calculation result?
Is there something wrong with my calculations?
Thank you.
