Board Mountable
DC-DC Converters
IMS 7 Series
Short Circuit Behaviour
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 con-
nected in series without any precautions, taking into consid-
eration 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 maxi-
mum ambient temperature TA max (see table: 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 max after the
warm-up phase. However, the relationship between TA and
TC depends heavily on the conditions of operation and inte-
gration into a system. The thermal conditions are influenced
by input voltage, output current, airflow, temperature of sur-
rounding components and surfaces and the properties of
the printed circuit board. TA max is therefore only an indica-
tive value and under practical operating conditions, the am-
bient temperature TA may be higher or lower than this value.
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. re-
quired in true redundant systems.
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 sec-
onds. Double output units (with exception of the -05-05-
types) are protected against overvoltages by a Zener diode
accross 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 fea-
ture 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 speci-
fied maximum value. The installer must ensure that un-
der all operating conditions TC remains within the limits
stated in the table: Temperature specifications.
Typical Performance Curves
Uo [V]
Uo [V]
05087
05086
13
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. 9
Fig. 10
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.
Uo1 [V]
Uo1, Uo2 [V]
05088
13.5
05039
14
13
13.0
12.5
Io2 = 0.03 A
Io2 = 0.3 A
12
11
10
Uo4
Uo1
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. 11
o1 versus Io1 (typ) for various Io2 (2 × 12 V).
Fig. 12
U
Flexible load distribution on double outputs (2 × 12 V) with
The cross load effect is negligible.
load variation from 0...150% of Po1 nom on output 1. Output
2 loaded with 25% of Po2 nom
.
Edition 1/7.2002
7/14
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