Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers

En5364qi

Altera_Forum
Honored Contributor II
1,785 Views

Hi, 

 

I have used  

[h=1]EN5364QI for getting a 3.3V from 5V input, the schematic is attached. I see no voltage on Vout, may the problem be about the SS pin connected to GND?[/h] 

Thanks for advance.
0 Kudos
6 Replies
Altera_Forum
Honored Contributor II
467 Views

From the datasheet... 

SS: A soft-start capacitor is connected between this pin to AGND. The value of the capacitor controls the soft-start interval and startup time.
0 Kudos
Altera_Forum
Honored Contributor II
467 Views

 

--- Quote Start ---  

From the datasheet... 

SS: A soft-start capacitor is connected between this pin to AGND. The value of the capacitor controls the soft-start interval and startup time. 

--- Quote End ---  

 

 

What happens when i connect SS directly to GND?
0 Kudos
Altera_Forum
Honored Contributor II
467 Views

It starts so softly that you never see a voltage at the output.

0 Kudos
Altera_Forum
Honored Contributor II
467 Views

 

--- Quote Start ---  

It starts so softly that you never see a voltage at the output. 

--- Quote End ---  

 

 

I have manufactured the pcb, so when i disconnect the SS and leave it no connect, can i see the voltage then? I am trying to know if a rework on pcb is worth it. 

 

Thanks
0 Kudos
Altera_Forum
Honored Contributor II
467 Views

Try it and see.

0 Kudos
Altera_Forum
Honored Contributor II
467 Views

 

--- Quote Start ---  

Try it and see. 

--- Quote End ---  

 

 

Today i will try ( leave Ss pin unconnected) and tell the results. You know its so hard to make that pin unconnected due to the package but i will try it with a technician.
0 Kudos
Reply