LT1070 power supply schematic

[jmx66]

Hi all,

I only want to build - if it is possible of course - a small power supply with a LT1070 .

How to replace L1 Coiltronics CTX02-11808-1 ?

Reference of a transformer for say 5 A , and 1.25 to 30 V. Homemade or off the shelf ?


Of course, idem for L2 Coiltronics CTX5-5-FR


Thanks a lot .

jm

 

[treez]

if you give me your spec as follows, ill do you a transformer spec that you can wind yourself on some off the shelf cores.
Vin=?
Vout = 1.25v to 30v?
Iout (max) = 5A ?

 

[jmx66]

Hi treez,

Thanks a lot for your help, first.

In short, i plan to get:

Transfos 160VA :

12V https://www.reichelt.de/Transformer...=2&ARTICLE=15266&GROUPID=3321&artnr=RKT+16012

15V https://www.reichelt.de/Transformer...=2&ARTICLE=15267&GROUPID=3321&artnr=RKT+16015


Transfos 300 VA :

12V https://www.reichelt.de/Transformer...=2&ARTICLE=40437&GROUPID=3321&artnr=RKT+30012

15V https://www.reichelt.de/Transformer...=2&ARTICLE=40438&GROUPID=3321&artnr=RKT+30015


Bridge B80C25A

https://www.reichelt.de/Rectifiers/...&LA=2&ARTICLE=4668&GROUPID=2998&artnr=B80C25A


Vin : ( 12 x 1,414 ) -1,1 = 16 V
( 15 x 1,414) - 1,1 = 20 V


I= 5 A or 7-8 A for 7-8 A heatsinks and fan mandatory, i think.....

V out 1,25 to 30V


- For L2 Coiltronics CTX5-5-FR what component to buy, in order to withstand 5A or 7 - 8 A , if this current is possible ?



Thanks a lot for your help; that's great.

jm

 

[treez]

If you have a 160VA transformer with a 15Vac output, youre right it gives 20V output after the rectifier at the smoothing cap.
Of course, from that point on you can only draw about 0.65*160W because of the poor power factor of rectifier/smoothing cap.
So that’s 104W….which means max current = 104/20 = 5.2amps.

I am not sure what you are using that CTX5-4-R inductor for, but it tells you the current rating in the datasheet.

 

[jmx66]

If you have a 160VA transformer with a 15Vac output, youre right it gives 20V output after the rectifier at the smoothing cap.
Of course, from that point on you can only draw about 0.65*160W because of the poor power factor of rectifier/smoothing cap.
So that’s 104W….which means max current = 104/20 = 5.2amps.

I am not sure what you are using that CTX5-4-R inductor for, but it tells you the current rating in the datasheet.

Hi treez,

Thanks a lot for your quick reply.

Frankly, i didn't think of a such weak power factor for this bridge!!!!!

I ' m going to google a lot, for CTX5 inductor or similar, in 5A to 8A range.

Thanks a lot.

jm