Power supply 1V for FPGA

Status
Not open for further replies.
A

akael

Newbie level 4
Joined
Jan 22, 2015
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Visit site
Activity points
1,315
Hello,
I need to get 1V from 5V, it is for an FPGA, Could someone recomend a circuit or IC?.
Most of the DC DC converters that i found work from 1.5V and so on. I found this DC-DC_Step_UP-Down_ZK-SJVA-4X module , which can give from 0.5V output, but i could find the schematic.
I hope can someone help

Thanks in advance
 

Sort by date Sort by votes
Upvote 2 Downvote
Solution
BradtheRad said:
Regulated 1 volt can be obtained from diodes or led's, with the help of resistive dividers. You may find something workable among these four methods.

View attachment 177560
Click to expand...

The tolerances on FPGA typically quite stringent. From an Intel white paper :




Power Requirements and Supply Solutions for FPGAs

The special power requirements of FPGAs, how to design a power supply for these clever chips, and a selection of power modules targeted at FPGA applications.
www.digikey.com


Regards, Dana.
 
Upvote 0 Downvote
BradtheRad said:
Regulated 1 volt can be obtained from diodes or led's, with the help of resistive dividers. You may find something workable among these four methods.

View attachment 177560
Click to expand...
These are all horrible ideas. None of them provide any amount of regulation.
 

Upvote 0 Downvote
Like barry said above, the FPGA vendor typically provides exact reference designs for DCDC converters. If you're not sure, tell us the FPGA's part number.
 

Upvote 0 Downvote
There's a lot of 5V in, <= 1V out POL DC-DC chips out there, you need to understand step load behavior of the FPGA and it's code to select current and loop response. A config that can go from idle to full thrash ( or inverse) is a tough challenge compared to one that ticks over at a constant clock, low simultaneous switching fraction of core gates.

A good-to-go module can be a good stepping stone until the load attributes are better known, enough to design a lower cost solution for the grimy bits.
 
Upvote 1 Downvote
In my post #4, for diodes substitute a 0.6 V Zener diode. For LEDs substitute 1.8 V Zener diode. That is, if you can find such a thing. I have not seen them, so I use the equivalent, namely plain diodes and LEDs. They are their own voltage regulators in the range of 1 V.
 
Last edited:

Upvote 0 Downvote
This is STILL a terrible idea. A "plain diode" e.g. 1N4148, will have a forward voltage from less than 0.4V to 1V, depending on temperature and current. That's a 250% variation!!!! NOT a good regulator.
 

Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…