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Visitor
Visitor
8,917 Views
Registered: ‎06-07-2012

Current consumption for Virtex 5 VCCINT and VCCAUX (XC5VFX130T)

Hi, I've posted before about excessive quiescent current consumption on the VCCAUX line, specifically, it's drawing about 1.3 amps of current when powered on. The curious part was that VCCINT line draws about 0.3/0.4 amps in the same environment. The power on sequence is VCCINT -> VCCAUX -> VCCIO

 

The data sheet suggests that quiescent current consumption is about 3 amps for VCCINT, and 180mA for VCCAUX.

 

Is it possible that some VCCINT connections are not properly connected on the board, therefore causing under current on that line, and due to VCCINT not getting enough power, VCCAUX ramps up the current consumption in response?

 

Thanks!

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Xilinx Employee
Xilinx Employee
8,905 Views
Registered: ‎07-31-2012

Hi,

 

1) Make sure you are measuring the correct Power input pin.

2) Make sure you are following the power supply ramp time as below.

 

ramp.PNG

3) Check if the board connections are fine. Check if the decoupling capacitances have been properly included on the power lines as suggested in the PCB user guide UG203 - Table 2-4 pg 15 - http://www.xilinx.com/support/documentation/user_guides/ug203.pdf

Thanks,
Anirudh

PS: Please MARK this as an answer in case it helped resolve your query.Give kudos in case the post guided you to a solution.
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Moderator
Moderator
8,900 Views
Registered: ‎02-16-2010

could you continue the discussion with previous post?
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