Power supply regulator with sense lines

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< Power Electronic ~ Power supply regulator with sense lines

eric

Posted: Thu Oct 05, 2006 2:33 am Post subject: Power supply regulator with sense lines

Site Admin Joined: 01 Jan 1970 Posts: 311

K.S.M. Walraven
There are applications in which it is important for the supply voltage
to be largely independent of the level of the output current,
which is, of course, particularly so in the case of variable loads.
When the load is linked to the power supply by relatively short
wires, a good variable power supply maintains the output voltage
at a virtually constant level. Unfortunately, in practice, these wires
can be fairly long, and since they have resistance, there is a voltage
drop across them. This interferes with good regulation; the
only way of avoiding this problem is to link the control part of the
power supply to the load via separate sense lines.
Unfortunately, this cannot be done readily in every power supply
without some tedious work, but as the diagram shows, in the
case of the L200 it presents no problems.
In the diagram, A and D are the usual output terminals, while
B and C are the sense input terminals. The output voltage, UO, is
UO=2.77(1+RP/R1),
where UO is in volts and RP is the effective resistance of P1. Resistor
R2 in series with terminal A enables current limiting. The peak
level of the output current, IO, in amperes is
IO=0.45/R2
The maximum input voltage to the regulator is 40 V, and the peak
output current is 2 A.
The regulator has on-board thermal protection, but this does
not mean, of course, that it should not be mounted on a suitable
heat sink when the dissipation is high.
The regulator is best built on the printed-circuit board shown,
which is available via our Readers’ Services – see toward the end of
this issue.

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