Booster circuit using lm2577 not working

[vaidyuta97]

hey guys,
i made the usual booster circuit given in the lm2577 datasheet and used the formulas given there as well. these were the values of the components:

IC: lm2577T-ADJ https://www.ti.com/lit/ds/symlink/lm2577.pdf

Inductor:
E.T=53.32 V*us I=0.511 L=447uH

compensating network:
Rc=700ohm Cc=0.33uF

Cout= 940uF

Cin = 0.44uF

diode: schottky 1n5817

however to my utter horror the circuit is giving a final o/p of 2.5V instead of 12V.
i then proceeded to try the circuit exactly as given on the link

https://www.hobby-hour.com/electronics/lm2577-switching-regulator.php

still no success. i am guessing there is a problem with either the inductor or the ic. i am using the resistor type of inductor and i suspect it doesn't support the 52KHz frequency necessary for lm2577.

apart from that i have no general idea as to why the circuit is malfunctioning.
please help! i have been stuck on this for a week now!

 

[ronv]

Chances are the little inductor is saturating because of it's low current rating. What is your load current?

 

[blueroomelectronics]

Chances are the little inductor is saturating because of it's low current rating. What is your load current?

Yep, those small resistor inductors won't work. Try using the one recommended in the datasheet.

 

[vaidyuta97]

Chances are the little inductor is saturating because of it's low current rating. What is your load current?

its 0.18A. i was told the inductor supports 0.5A, which fits my calculation for inductor current.

also none of the inductors given in the datasheet are available in my city (unless ordered online, for which they charge almost triple the amount), any idea how to fabricate an inductor?

 

[absf]

its 0.18A. i was told the inductor supports 0.5A, which fits my calculation for inductor current.

also none of the inductors given in the datasheet are available in my city (unless ordered online, for which they charge almost triple the amount), any idea how to fabricate an inductor?

May be you can refer to this link and see how someone solve a similar problem...

https://forum.allaboutcircuits.com/showthread.php?t=86364

Allen

 

[vaidyuta97]

ok, seems i'll have to replace the inductor, for that i'll have to fabricate one.
this will be really interesting.
anyone has any idea on how to fabricate one?