Confusion on type of capacitor to be used in SG3524.

[AbhimanyuSingh]

While using SG3524, for buck converter, I need to give a feedback to the error amplifier at pin 1. At the output of the error amplifier (pin 9) I have the Caps and Resistors for compensation. Do the capacitors here need to be ceramic disc capacitors necessarily? Or any specific type of capacitors?? Cannot I use Electrolytic aluminium capacitors? The problem arises because I got ceramic bead capacitors of value only 0.1 microfarad, whereas I need a capacitor of very high value there (I might be wrong).

 

[FvM]

Compensation uses nF order of magnitude usually. You won't find electrolytic capacitors for it.Where did you get the "very high value" idea?

 

[pol]

i also want to make the feedback to pin 1 to control the output the voltage but i can't....

i want my output 13,8 v.....

- - - Updated - - -

i also want to make the feedback to pin 1 to control the output the voltage but i can't....

i want my output 13,8 v.....

 

[goldsmith]

Dear Pol
Hi
IS isolation important for you ? if not vout=vref(1+R1/R2) . ( with two resistor ) . if yes , with a zener diode and opto coupler or a variable zener such as TL431 . and for compensation , i don't think the value of capacitor be as large as you told ! how you said it ? randomly ?
Best Wishes
Goldsmith