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minel

problema sursa receiver sat

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Am sursa din imagini echipata cu integrat-sursa DL0165R si am probleme pe cateva din tensiuni:

 

12v-13.5v

-12v - (-13.5)v

22v-24.5v

Am inlocuit: c-urile care nu dadeau bine pe esr,tl431(2.5v ref.-ok) rezistentele din divizor-ok,optocuplor am inlocuit chiar si choperul si integratul dar degeba.

Am refacut majoritatea lipiturilor.

Nu stiu ce ar putea sa creasca tensiunile avand in vedere ca bucla de feedback e ok? 

 

am gasit si o schema oarecum  asemanatoare pt ca asta are  stabilizare suplimentara pt 3.3 si 5v

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Edited by minel

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Guest

Ai testat in gol?Pe ce tens este bucla de control?

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 Ce probleme avea aparatul respectiv ? Poate nu au legătură totuși cu sursa.

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Rezolvat!

Mea culpa: bucla de control este pe 3.3v ,desi tensiunea era ok pe aceasta bucla si capacitatea c-ului era cat scrie pe el-1000uF- esr-ul era 0.8 suficient de mare

ca sa nu fie ok,initial l-am ignorat si dupa ce am inlocuit c-ul a revenit la starea initiala.Pe celelalte tensiuni chiar daca esr-ul este si peste 2 ohmi nu sunt pb 

Multumesc!

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