Short Circuit Behavior
Connection in Series or in Parallel
The current limit characteristic shuts down the converter
whenever a short circuit is applied to its output. It acts self-
protecting and automatically recovers after removal of the
overload condition (hiccup mode).
Connection in series:
The outputs of single or double output units can be
connected in series without any precautions, taking into
consideration that the highest output voltage should remain
below 60 V for SELV operation.
Thermal Considerations
Connection in parallel:
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated
Double outputs of the same converter with equal output
voltage (e.g. 5V / 5V) can be put in parallel and will share
their output currents almost equally. Parallel operation of
single or double outputs of two or more converters with the
same output voltage may cause start-up problems at initial
start-up. This is only advisable in applications where one
converter is able to deliver the full load current as e.g.,
required in true redundant systems.
maximum ambient temperature TA
(see table:
max
Temperature specifications) and is operated at its nominal
input voltage and output power, the case temperature TC
measured at the Measuring point of case temperature TC
(see: Mechanical Data) will approach the indicated value TC
after the warm-up phase. However, the relationship
max
between TA and TC depends heavily on the conditions of
operation and integration into a system. The thermal
conditions are influenced by input voltage, output current,
airflow, temperature of surrounding components and
surfaces and the properties of the printed circuit board.
TA max is therefore only an indicative value and under
practical operating conditions, the ambient temperature TA
may be higher or lower than this value.
Output Overvoltage Protection
The outputs of single output units and -05-05- types are
protected against overvoltages by a second control loop. In
the event of an overvoltage on the output the unit will shut-
down and attempt to restart approximately every 0.4
seconds. Double output units (with exception of the -05-05-
types) are protected against overvoltages by a Zener diode
across the second output. Under worst case conditions the
Zener diode will short circuit. Since with double output units
both outputs track each other the protection diode is only
provided in one of the outputs. The main purpose of this
feature is to protect against possible overvoltages which
could occur due to a failure in the feedback control circuit.
The output overvoltage protection is not designed do
withstand externally applied overvoltages.
Caution: The case temperature TC measured at the
Measuring point of case temperature TC (see: Mechani-
cal Data) may under no circumstances exceed the
specified maximum value.The installer must ensure that
under all operating conditions TC remains within the
limits stated in the table: Temperature specifications.
Typical Performance Curves
Uo [V]
Uo [V]
05086
13
05087
5.5
12
11
10
9
5.0
4.5
4.0
3.5
3.0
8
7
Io total [A]
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
0
0
0.2
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Io [A]
0.4
Fig. 7
Fig. 8
Uo versus Io (typ) of single output units with Uo = 5.1 V.
Uo versus Io (typ) of double output units, with both outputs
in parallel.
Vo1, Vo2 [V]
05039
Uo1 [V]
14
13
05088
13.5
13.0
12
11
10
Vo4
Vo1
12.5
Io2 = 0.03 A
Io2 = 0.3 A
12.0
11.5
11.0
Io1
Io1 nom
[%]
50
75
100
125
150
0
25
0.03
0.10
0.15
0.25
0.35 Io1 [A]
0.05
0.20
Fig. 10
Fig. 9
Flexible load distribution on double outputs (2 x 12 V) with
load variation from 0...150% of Po1 nom on output 1. Output
Uo1 versus Io1 (typ) for various Io2 (2 x 12 V).
The cross load effect is negligible.
2 loaded with 25% of Po2 nom
.
APR 20, 2006 revised to JUN 07, 2006
Page 7 of 14
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