Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Altera PL-APU USB Master Programming Unit (Power supply ratings Help!)

Hi Folks, I just recently acquired an Altera PL-APU Master programming unit. (The USB version) I am wondering if anyone knows the Voltage and current rating needed for the DC Power supply...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

What I would do is to gradually increase the DC voltage input and monitor all the LM317 regulators. IIRC the voltage adjustment pin should be at 1.25V. Increase the input voltage until all the LM317 have the correct adjustment voltages, and then measure all their output voltages. Using the highest regulated voltage and the minimum dropout requirement from the LM317 datasheet you'll know the minimum input DC supply voltage. I don't think that anything sensitive is directly running an the DC input supply.