How to design a Boost Converter | Using LM3842

[@djpupsik98]

Finally... i found a guy with an accent who describes the subject i need. My CuRiOsItY is satisfied

[@FoolishEngineer]

Thank you!!

[@sukhdeosingh617]

Your explanation is excellent for the practical field application. Thank u sir.

[@FoolishEngineer]

You are most welcome

[@gonzalovigliola9686]

Hello, I do not speak your language and you tube does not give me the option to translate, even so I could do the simulation and it worked very well, thank you !!! Sorry for any error in the translation, my language is Spanish.

[@FoolishEngineer]

Thank you so much!!!

[@koresso3756]

Hello sir, I need to design a buck-boost converter the way you did in the video, are you gonna release such a video for this converter ? thanks in advance

[@tomass9235]

Great educational video. Can you please explain more, why at @7:16 you consider the RC filter frequency to be 200Hz if we use 20kHz oscillation for the chip ?

[@FoolishEngineer]

Tomass well.. we are taking a feedback of current overtherewhich is in fluctuating format, so the signal of 20k is not possibe to sense by that IC. So we have connected a low pass filter with frequency 200 hz. Its upto you, hou can take it 100 or 50 or 60.. no problem at all.

[@tomass9235]

thanks, that answers my question. Previously it was just unclear to me is there some best practice selecting that frequency or mathematical relation.

[@SudiptaMandalsuri]

u make great videos

[@FoolishEngineer]

Thank you so much for watching!!

[@abadyelhertany8604]

doesn't the voltage divider cause huge losses? is it the only way to take voltage feedback?

[@FoolishEngineer]

no. yes.

[@vicentematricardi3596]

Muy Bueno tu canal ,aunque no comprendo tu idioma , puedo seguirte , te felicito , Muchas Gracias !!!!!

[@FoolishEngineer]

Muchas gracias por mirar

[@akashjagtap8658]

Nice re parag...Good work for electrical engineers...... I am just a dumb mechanical engineer...So i just need to know the practical applications of the crkts explained above in machines....☺...Keep it up......

[@FoolishEngineer]

Thank you Brother..!!

[@BFC24]

Can I use 3842 for buck converter?

[@FoolishEngineer]

Sure, there will be a lot of application note for this out there. Let me check & get back to you

[@chuchogarcia3564]

Hi, nice video, just a question, how do you calculated the Co capacitor? following the ecuation of Co= (D*Vo)/(Vr*R*Fosc), my result is different, i get 250 uF, and you have 52 uF, how did yo get that? Thanks

[@FoolishEngineer]

I have checked my calculations, those are fine, can you check yours again? or share me which value you have considered for calculation?

[@chuchogarcia3564]

@@FoolishEngineer i used the following values: D=0.5 Vo=48 V Vr=100 mV R=48 ohms F=20 kHz So, i have the next equation; Co= (48*.5)/(20000*48*.1) So, that gave me as result a 250 uF capacitor for Co, what is wrong? **( I just noticed that you used .48 V for vr, but, i thought that you defined vr as 100 mV, so, what value i must considered? )** Another questions, the R4 AND R5 resistors, what are there for AND how did you calculated them? Thank you so much for your answers

[@FoolishEngineer]

@@chuchogarcia3564 my friend Vr is ripple it should be considered 100mV, the value 52uF is correct please check your calculations again, R4 and R5 are just voltage divider for reference to give it to the IC. please check the datasheet

[@chuchogarcia3564]

@@FoolishEngineer thank you friend! Have a nice week :)

[@muhammadshaaban5226]

Can we use uc3842 to make a buck converter , and if we can how it is done ?

[@FoolishEngineer]

Yes we can, You can find the different application note of the same on internet

[@maciejwisniewski1571]

How you calculate R4 resistor ?

[@FoolishEngineer]

Please check the formulae, Thank you so much for watching!!

[@eisaalyaqoub5251]

Thank you for this clear explanation..... One question, if I want to adjust the output voltage, how should I connect a Potentiometer ?

[@FoolishEngineer]

You can connect a potentiometer at the reference. If you search You will find the application note for adjustable SMPS online.

[@vickynik565]

Which software used for simulation

[@FoolishEngineer]

PSIM

[@Yorumcu63]

Great

[@alvinfrancisco2025]

Thanks bro!! Big help

[@FoolishEngineer]

Thank you so much for watching!!

[@naturebrain6681]

How to get 20 ampere at 48 v out put Please specify capacitor and inductor values for 20 amps out

[@FoolishEngineer]

Please calculate using the formulae mention in the video

[@ankitshetty6580]

how did you get 5.5 in peak current and 1.72 in rt ,ct

[@FoolishEngineer]

peak current is from the formula from a reference book it is the formula, given in the datasheet of lm3842 for Rt and Ct

[@muhammedesa796]

how the ic keep its output constant regardless of the input?

[@FoolishEngineer]

there is Close loop system which consists of PI or PID controller helps to regulated the output

[@ugurcnar2866]

Thanks for the video. Can you please share your referances ?

[@FoolishEngineer]

you can check the datasheet of the part

[@TheJavaSync]

In order to drive 100w LED - how it should be & unfortunately I didn't succes on UC38XX '( '('(

[@FoolishEngineer]

TheJavaSync see the voltage requirements of that 100w LED and find current needed if you get those 2 values you can design a supply for that.

[@TheJavaSync]

Foolish Engineer I think it is 35v 3Amps, thx :)

[@ayushchauhan1738]

I am having trouble in simulation as I am not getting a boosted output voltage. Can you help me out with the query in a mail?

[@FoolishEngineer]

Ayush Chauhan why not my friend, mail me your simulation on [e-mail] I ll try to solve it

[@ahmadmadi2547]

Hello my friend, great work! I have a question, are you sure you got 100 mv(p-p) as output ripple ? I think you've got much greater ripple, could you please check that ? thank you.

[@FoolishEngineer]

It is just a simulation & trust me 10mV ripple is nothing for an SMPS.

[@mousaabusalem2]

i need more amp how can i make is can you help me for that

[@FoolishEngineer]

You can select high power components.

[@mohamedsaleh8719]

THANK YOU , I Amused to your video

[@FoolishEngineer]

Thank you so much for watching!!

[@noufnalkhaledi4393]

How can I contact with u?

[@FoolishEngineer]

Please Email me at [e-mail]

[@mousaabusalem2]

pin 6 out out volt ..........................?

[@FoolishEngineer]

We can check that in Datasheet!