OUTPUTS ARE NOT AS EXPECTED IN LM26480

Uppili Prasadh

Other Parts Discussed in Thread: LM26480

I am using LM26480 to derive 1V,1V8 and 3V3 outputs for FPGA.The schematic is made with reference to the LM26480EVM schematic.But i am not getting the expected outputs and i am getting 5 Volt at the output side.request you to give the suggestion to this post.

Regards,

uppili prasadh

over 9 years ago

0 Sheng Jin over 9 years ago

TI__Expert 3370 points

Hi uppili,

can you share the schematic please?

0 Uppili Prasadh over 9 years ago in reply to Sheng Jin

Prodigy 60 points

0 Uppili Prasadh over 9 years ago in reply to Sheng Jin

Prodigy 60 points

Hi,
Please find the schematic of LM26480.
we are getting a drop in 5V on one end of R71near to the IC end.
We are getting a drop in enable SW1 and SW2 resistors.

Regards,
Uppili prasadh

0 Sheng Jin over 9 years ago in reply to Uppili Prasadh

TI__Expert 3370 points

Hi,

thanks! how many part/board did you measure? if more than one, are they having same issue? what do you mean "a drop"? C1& C10 should be removed.

0 Uppili Prasadh over 9 years ago in reply to Sheng Jin

Prodigy 60 points

Dear Sir,
Sorry for the late reply
We measured in 6 boards.All boards are having the same issue.
We are getting a a drop in 5V in ENSW1 and ENSW2 resistor that is we are getting 2.3V.
Yes we removed C1 and C10 and tested Still we got the same outputs.

Regards,
Uppili prasadh

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OUTPUTS ARE NOT AS EXPECTED IN LM26480