14 Power requirements
The Pluto boards have their own voltage regulator, so don't have stringent requirements on a power supply.
14.1 Wall adapter
Most common (semi-regulated) 5V to 10V “wall adapter” DC
supply works fine.
In practice, the Pluto boards work with an input voltage as low
as 4.5V, or as high as 15V (although the voltage regulator
might become hot in the later case, so it is better to keep the
input voltage low).
14.2 USB to power jack cable
The “USB to power jack cable” (picture on the right) is another simple way to power
the Pluto boards. It is available on KNJN's power cables page (item#6025).
14.3 Power consumption
The Pluto boards don’t consume much by themselves (usually less than 100mA). The
consumption depends more of what you connect to them. A supply that provides a
few 100mA is adequate for most applications.
14.4 Voltage regulator temperature
The Pluto boards voltage regulator can get hot in some instances.
Here are the two things to do in this case:
1. Check your DC-adapter output voltage. The higher it is, the warmer the voltage regulator gets, so try to use one
adapter with a low voltage output (+5V is ideal).
2. Check the current consumption: the more current drawn out of the regulator, the warmer it gets. So if your FPGA
board is heavily loaded (lots of IOs connected), the regulator may get hot.
If the voltage regulator gets too hot, it shuts down automatically and the board stops working temporarily.
FPGA RS-232 development boards Page 19
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