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Application for PM2812 and PM2813 D - 5
The channels 1 and 2 operate in the Constant Current mode, and Channel 3 in
the Constant volta
g
e mode.
This example will not work if the current throu
g
h the load decreases below 10A.
Then the current contribution of Channel 3 is reduced to 0A, and either Channel
1 or Channel 2 (or both) will enter the Constant Volta
g
e mode (at 10.1V). As there
are now at least two channels in Constant Volta
g
e mode, the one with the lowest
Vset (Channel 3) will activate its down pro
g
rammer, sinkin
g
about 0.5A. If you are
not quite certain about the minimum current required, you are advised to use the
procedure
g
iven under case 3. Then you must adjust all channels exactly to 10V.
Case 3: Constant Volta
g
e, Output Current from 0A to the maximum
This needs the most care to prevent a down pro
g
rammer to become active,
because all channels must be set exactly to the same volta
g
e. This can best be
done at low output currents. Do this as follows. Connect the channels in parallel.
Connect a load that allows the required volta
g
e and needs a small current, for
example 1% of the required maximum current. Set all channels to the required
Constant Volta
g
e value and to an equal part of the required maximum current. If
the volta
g
es from all channels are exactly equal, then all channels will supply an
equal part of the current. If a channel does not supply current (readback 0.00A),
select this channel and use the -V+ button to carefully increase the volta
g
e until
the channel starts to supply current.
Check if the other channels still supply current. If not, you may have increased the
volta
g
e of one channel to much. If all channels supply current, disconnect the load
and connect the real load.