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Inductor Calculation for ADP 5054

Question asked by Ranganadh on Apr 12, 2016
Latest reply on Apr 14, 2016 by hyao

Hi,

 

Can any one help me out on below query.

 

Based on the BOM generated from ADP505x_BuckDesigner_Release.xls i got the below inductor values with below inputs.

 

Vin=5V, SW frequency=600Khz

 

Vout1: 3.3V@4A, inductor values suggested in .xls is (1.4uH)

Vout2: 2.5V@4A, inductor values suggested in .xls is (1uH)

Vout3: 1.8V@2.5A, inductor values suggested in .xls is (8.2uH)

Vout4: 1V@2.5A, inductor values suggested in .xls is (6.8uH)

 

But based on formula given in datasheet (Page no 25)if we calculate below values are coming

Vout1: 3.3V@4A, inductor value(1.33 uH, nearset value 1.5uH)

Vout2: 2.5V@4A,  inductor value(1.48 uH, nearset value 1.5uH)

Vout3: 1.8V@2.5A, inductor value(2.19 uH, nearset value 2.2uH)

Vout4: 1V@2.5A,  inductor value(1.52 uH, nearset value 1.5uH)

 

 

vout 1 is Ok, vout 2 is nearst value, vout3&4 are not nearest values, can you kindly check let me which values to be followed for design.

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