Author Topic: Don't know what adapter I need  (Read 220 times)

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Offline msuffidy

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Don't know what adapter I need
« on: May 04, 2020, 06:21:18 am »
A few days ago I found some for free development kits on the local internet. The kits actually have everything mostly you need but it is missing the power adapter for an old Altera Cyclone (1) board. By searching I saw someone selling one on EBAY that mentioned a 9Volt DC adapter. I have a schematic and a dv meter so I think I can tell what polarity the plug is, but I am not sure of what voltage/amps it has to be. I see on the schematic the plug goes into a chip called a SP6134 and has later a 5V and 3.3V output. Any info on this? Like are all cyclone 1 boards 9V and is like 100ma a good amperage? I don't know if it even works or will self destruct how it was configured. Also I got a Infineon XC800 usb thing and a M16C kit.

This board looks identical to this one:
« Last Edit: May 04, 2020, 06:31:50 am by msuffidy »
 

Offline msuffidy

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Re: Don't know what adapter I need
« Reply #1 on: May 05, 2020, 03:39:56 pm »
Can this be used to somehow solve for the input voltage?

 

Offline blueskull

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Re: Don't know what adapter I need
« Reply #2 on: May 05, 2020, 04:19:56 pm »
The SP6134 has a maximum 4.5V UVLO, and the divider is 2:1, so input has to be at least 9V for the chip to run. The Sipex chip supports up to 15V input, and the FETs can take higher.

I would go with 12V perhaps. Since 12V is not much lower than 15V, you only have little headroom, so any line inductance induced over voltage may kill the board.

Thus, I will plug the barrel jack in first before plugging in the adapter to wall, and vice versa.
 

Offline msuffidy

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Re: Don't know what adapter I need
« Reply #3 on: May 05, 2020, 04:51:43 pm »
Thanks for the info there!
 


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