Hi @anishkgt,

There is usually a reason for the values selected by the vendors in their reference designs. They have experience with their chips and know how to get the best results. In the case of setting the Vout value, having the resistors in the >100K range is probably related to the stability of the circuit. In the case of setting Viset, using higher values reduces the load on the Vref pin, at a minimum.

The datasheet stated that Viset should be no greater than 2V (page 6 and 12). Viset is set by the voltage divider circuit using Vref, R5, and R6. So, in your circuit:

`Viset = Vref x {R6/(R5+R6)} = 3.3V x {100K/(100K+65K)} = 2.0V`

Then, Icharge uses equation 2 on page 12:

`Icharge = Viset / (20 x Rsr) = 2.0V / (20 x 0.010 Ohms) = 10A`

I still do not know your input voltage, so I don’t know what your ripple currents will be, but using the values in the spreadsheet you show, I get inductor Iripple of:

`Iripple = {Vin x D x (1-D)}/(fs x L) = {19 x 0.43 x (1-0.43)}/(600kHz x 6.8uH) = 1.14A`

However, in your case you will be using 3.3uH for L and if your input voltage were different, then you would also have a different value for duty cycle “D”.