Lm25019

Hi Sourabh,

Would you be able to help answer some clarifying questions? Can you share your schematic?

Do you have any specific questions about the formulas? Or is your board performing differently than you expect?

Thank you,
Katelyn

Good Morning Mam

here is the schematic of circuit in these i using 69 micro henry coupled inductor and switching frequency of 270 Khz. Please help me with 

Regards 

Sourabh 

Using the formula for decide the frequency given in the datasheet figure 14 where the output is set to 10 volt by using Ron resistor value of 237 K, but when i check these value by given formula F = vout/K * Ron where K is 9*10^-11 and my calculation show different value given in the calculated frequency of 400 Khz with vout of 10 Volt. Please help me with this.
Thanks
Sourabh

Hi Sourabh,

I calculate FSW is approximately 460kHz. What do you calculate?

What is the input voltage for your design?

Thank you,
Katelyn

Hi Sourabh,

I want to follow up with you on this thread.

I calculate FSW is approximately 460kHz. What do you calculate?

What is the input voltage for your design?

Thanks,
Katelyn