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Ad13's avatar
Ad13
Icon for New Contributor rankNew Contributor
5 years ago

Enpirion EM2130L02QI

I am using EM2130L929QI to provide 0.9V core voltage for Cyclone 10GX FPGA. The device is turning off after between 2 and 45 seconds. I have another 2130 on the board providing 3.3V and it is working...
Mostafa_Intel_AE's avatar
Mostafa_Intel_AE
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

Hello @Ad13 ,

Since the part able to boot for some short time, that's mean there is a fault triggered.

So could you please share your schematic for EM2130_0.9V rail and also please provide a waveform for Vout during the fault.

Also the rail could shutdown if you are using a sequencer to control the on/off sequence and that controller bring the rail off.

So please also probe CTRL signal too incase that signal pull down after the power on.

Probably you are not able to communicate with the regulator through PMBUS if the bus is busy or the 5VCC is off.

Thanks,

Mostafa

Ad13's avatar
Ad13
Icon for New Contributor rankNew Contributor
5 years ago

Hello Mostafa,

I think I have found my problems. Firstly the RTUNE resistor was changed to 1K5 from 6K04 and the output of the regulator is stable for much longer.

I have 2 devices side by side (one for 0V9 and another for 3V3) and if I disable the 3V3 regulator the 0V9 device works perfectly and is stable and continuous. Long story short it looks like the 3V3 regulator is causing ground instability issues on the 0V9 reg. and I think the 0V9 was shutting down because of this.

Unfortunately it means a re-spin.

Many thanks.