dear
If there have LM3421 low ripple current sulotion such as sch or calculated inductance excel? performace details show as below:
Input above 48V, output 43V, average current 3A, ripple current maximum plus or minus 200mA, thanks in advance
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dear
If there have LM3421 low ripple current sulotion such as sch or calculated inductance excel? performace details show as below:
Input above 48V, output 43V, average current 3A, ripple current maximum plus or minus 200mA, thanks in advance
Hello,
Section 8.2.1.1 has the design equations for you to calculate your values. Section 8.2.7 give you an example of a Buck regulator for your application if input volte is always above output voltage.
Thanks Tuan
Hello,
We are looking into this, and an engineer will get back to you by the end of the day with updated sections for these equations.
Thanks,
Caroline
Hello CS,
Yes, the sections mentioned are in the data sheet.
Thanks Tuan
HI CS,
I am sorry, I was looking at an older version of the specification. Please see section 9.2.1.1 where we have the requirements and section 9.2.1.2 (page 35) on down we have the equation for inductor and all the power stage components. Section 9.2.7 shows the schematic along with requirements and part list for a Buck regulator.
Thanks Tuan
dear tuan
9.2.7 For example, in the BUCK scheme, the 700K frequency configuration is RT 35.7k and CT 1NF, and the corresponding formula is Fsw=25/ (RT*CT). However, in the previous formula, Fsw=25*(Vv-VO)/(RT*CT *Vin) is used to introduce the BUCK, which is a little contradictory.
any advise? thanks in advance
Hi CS,
The Rt value in the part list for the Buck is not correct and it's a typo error...Please use the formula in section 9.2.1.2.2 for Rt calculation.
Thanks Tuan