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Altera_Forum's avatar
Altera_Forum
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10 years ago

CycloneIV-E: Heating issue

Hey Members, it's my first post here and I'm also pretty new in FPGA-PCB-Design ;) I designed a 10-Layer CycloneIV-PCB with 5 different switching regulators (LT3690). I use the CycloneIV E...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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I think it's very doubtful that "switching noise" is causing your FPGA to heat up. Isn't it more likely that your switching regulators dissipate some heat of their own, and this contributes to heating the FPGA?

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I thought the same in the beginning but the only switching regulator which has significant heat dissipation is the 3.3V-regulator. The 1.2V for example drives only 0.05mA for VCCINT. Even when I only have this enabled the FPGA is heating up more than with ALL voltages from the lab power supply.