PSC Series Extended Data Sheet
Positive Switching Regulators (Industrial)
05010
Vo
Parallel and Series Connection
Vod
DVo I
DVo I
Outputs of equal nominal voltages can be parallel-con-
nected. However, the use of a single unit with higher output
power, because of its power dissipation, is always a better
solution.
Vod
td
td
t
t
In parallel-connected operation, one or several outputs may
operate continuously at their current limit knee-point which
will cause an increase of the heat generation. Conse-
quently, the max. ambient temperature value should be re-
duced by 10 K.
I /I
o
o nom
1
0
Outputs can be series-connected with any other module. In
series-connection the maximum output current is limited by
the lowest current limitation. Electrically separated source
voltages are needed for each module!
≥10 µs
≥10 µs
Fig. 3
Dynamic load regulation.
Short Circuit Behaviour
Thermal Considerations
A constant current limitation circuit holds the output current
almost constant whenever an overload or a short circuit is
applied to the regulator's output. It acts self-protecting and
recovers – in contrary to the fold back method – automati-
cally after removal of the overload or short circuit condition.
When a switching regulator is located in free, quasi-station-
ary air (convection cooling) at a temperature TA = 71°C and
is operated at its nominal output current Io nom, the case
temperature TC will be about 95°C after the warm-up
phase, measured at the Measuring point of case tempera-
ture TC (see: Mechanical Data).
Vo/Vo nom
I
Under practical operating conditions, the ambient tempera-
ture TA may exceed 71°C, provided additional measures
(heat sink, fan, etc.) are taken to ensure that the case tem-
perature TC does not exceed its maximum value of 95°C.
05033
1.2
1.0
0.8
Io L
Example: Sufficient forced cooling allows TA max = 85°C. A
simple check of the case temperature TC (TC ≤ 95°C) at full
load ensures correct operation of the system.
Io/Io nom
0.6
0.4
0.2
Io/Io nom
0
Fig. 5
Overload, short-circuit behaviour Vo versus Io.
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Forced cooling
1.0
0.9
0.8
Convection cooling
0.7
0.6
TC max
0.5
0.4
0.3
0.2
0.1
0
T [˚C]
A
T
50
60
70
80
90
100
A min
Fig. 4
Output current derating versus temperature
Output Protection
A voltage suppressor diode which in worst case conditions
fails into a short circuit (or a thyristor crowbar, option C)
protects the output against an internally generated over-
voltage. Such an overvoltage could occur due to a failure of
either the control circuit or the switching transistor.The out-
put protection is not designed to withstand externally ap-
plied overvoltages. The user should ensure that systems
with Power-One power supplies, in the event of a failure, do
not result in an unsafe condition (fail-safe).
REV. MAY 12, 2004
Page 5 of 13
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