3.3v/5v - VFB (Feedback) should be 2V proven by calculation

[mnciks11]

Hello guys

The 3.3v and 5v always

Hope you are all okay brothers, i went through voltage dividers,Calculations, for those who are new a specially, it's so true that when check the Feedback pins for 3.3v always and 5v always you should get 2V on those pins...

Below is the link to my calculation calculating the Feedback volts

https://youtu.be/Ufks5ucea5w

[ktmmotocross]

Re: 3.3v/5v - VFB (Feedback) should be 2V proven by calculation

https://www.google.com/search?q=volt...hrome&ie=UTF-8

FB must NOT be 2v because it is used to regulate output from 2-5,5V. read datasheet

this ic is way old. newer 3/5V ic dont use FB but have fixed output

[mcplslg123]

Re: 3.3v/5v - VFB (Feedback) should be 2V proven by calculation

Dont agree with your assumption of 2V on FB pin.

[mnciks11]

Re: 3.3v/5v - VFB (Feedback) should be 2V proven by calculation

Dont agree with your assumption of 2V on FB pin.

Yes I understand, on old chips yes I agree, all PWM have the FB , although they don't use voltage dividers but I'm gonna check how they work…They do have the FB , but latest ones don't