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Altera_Forum's avatar
Altera_Forum
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14 years ago

Cyclone III FPGA power supply problem

hello, i am working on fpga based project. i m using cyclone3 fpga. in dat we hav 1.2v n 3.3v supplies necessary for i/o operation. we are using two TPS54310 ic's for both the supplies. we connect...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

You are right about TPS54310, for some reason i didn't find it. But it's basically identical to the TPS54311 I mentioned.

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the capacitor(6.8uF) we are using across the inductor(2.2H) at the output.

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Your additional explanations don't make much sense. No switch mode regulator uses an inductor of 2.2h. Do you mean µh? I also can't see, how a capacitor will be connected across the inductor.

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pin2 is VSENSE its voltage range is -0.3v to 4v which is coming around 0.4v

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Do you mean, there is no stable measurement at all?

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Vout is 0v.

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In this case, Vsense would be 0V as well, presuming a correct circuit and correctly performed measurement.

Two questions from my previous post are unanswered yet.

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Did you try to disconnect the load? You should show a complete schematic.

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