Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Cyclone III FPGA power supply problem

hello, i am working on fpga based project. i m using cyclone3 fpga. in dat we hav 1.2v n 3.3v supplies necessary for i/o operation. we are using two TPS54310 ic's for both the supplies. we connect...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

sir,

i m sorry i wrote 2.2H by mistake. it is actually 22uH.

and the inductor & capacitor are connected parallel jus lyk it is in the TPS54310 ic datasheet...

so if we remove that capacitor, still the output is 0.

yes u r rite Vsense is 0 that time. but when we are using this capacitor, Vsense is around 0.4v instead of 0.9v.

i can't giv u the schematic...... i m not permitted to do so.....

i tried dis power supply circuit on an extra board,only present on the board, without even the main FBGA chip.

still it is showing the same values...

i hope u got my problem now correctly.........

ann