FPGA, SoC, And CPLD Boards And Kits
FPGA Evaluation and Development Kits
Announcements
Intel Support hours are Monday-Fridays, 8am-5pm PST, except Holidays. Thanks to our community members who provide support during our down time or before we get to your questions. We appreciate you!

Need Forum Guidance? Click here
Search our FPGA Knowledge Articles here.
5152 Discussions

Cyclone IV GX FPGA Development Kit Power Supply. Why so sophisticated?

Altera_Forum
Honored Contributor II
1,087 Views

Why Power Supply on "Cyclone IV GX FPGA Development Kit" is so sophisticated? 

Why not use simple 3-pin LDO instead of multi-pin Linear Regulators used on this Kit? 

A picture from "Cyclone IV GX FPGA Development Board Reference Manual" is attached.
0 Kudos
3 Replies
Altera_Forum
Honored Contributor II
131 Views

 

--- Quote Start ---  

Why Power Supply on "Cyclone IV GX FPGA Development Kit" is so sophisticated? 

 

--- Quote End ---  

 

What do you consider it sophisticated? The Pin Connection Guidelines for each FPGA describes how Altera recommends powering the FPGA. Multiple linear regulators are required to generate and/or isolate the required voltages. 

 

 

--- Quote Start ---  

 

Why not use simple 3-pin LDO instead of multi-pin Linear Regulators used on this Kit? 

 

--- Quote End ---  

 

FPGAs have a power-on requirement that the power rails ramp in a well-defined time period. Multi-pin linear regulators generally have enable and soft-start functions that can be used to aid in power-on sequencing. A simple 3-pin linear regulator does not provide this functionality. 

 

Cheers, 

Dave
Altera_Forum
Honored Contributor II
131 Views

 

--- Quote Start ---  

What do you consider it sophisticated? The Pin Connection Guidelines for each FPGA describes how Altera recommends powering the FPGA. Multiple linear regulators are required to generate and/or isolate the required voltages. 

Dave 

--- Quote End ---  

 

This one from TI seems much simpler with less BOM and no precision resistors.
Altera_Forum
Honored Contributor II
131 Views

 

--- Quote Start ---  

This one from TI seems much simpler with less BOM and no precision resistors. 

--- Quote End ---  

 

The TI example also does not use 3-pin LDOs :) 

 

Evaluation kits are not necessarily built with the "best" components, they are quite often built with "sponsors" components. Take a look at any of the Altera evaluation boards. For example, several of the kits I have, use Linear Technology parts and have "Linear Technology" on the silk of the PCB. That is there not because Altera loves Linear Technology, but because Linear Technology provided the parts for the evaluation kit :) 

 

The best way to select parts is to ensure that you have design tools for the parts. For example, Linear Technology's LTspice is a very good simulation tool and has an excellent Yahoo support group. 

 

Cheers, 

Dave
Reply