Board Mountable DC-DC Converters IMS 15 Series
Edition 1/04.2001 6/14
Table 5b: Output data for dual and double output units.
Output 2 × 5 V 2 × 12 V 2 × 15 V 2 × 24 V
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
U
o1 Output voltage
U
i nom 4.92 5.08 11.82 12.18 14.78 15.22 23.64 24.36 V
U
o2
I
o = 0.5
I
o nom 4.92 5.08 11.82 12.18 14.78 15.22 23.64 24.36
I
o nom Output current 1
U
i min...
U
i max 2 × 1.4 2 × 0.7 2 × 0.56 2 × 0.35 A
I
oL Current limit 2, 4
U
i nom,
T
C = 25°C 3.5 1.9 1.6 0.95
U
o = 90%
U
o nom
D
U
o U Line regulation
U
i min...
U
i max,
I
o nom ±1±1±1±1%
D
U
o l Load regulation
U
i nom ±3±3±3±3
I
o = (0.1...1)
I
o nom
u
o1/2 Output voltage noise
U
i min...
U
i max 580 120 150 240 mVpp
I
o =
I
o nom 640 60 75 80
U
o L Output overvoltage limit. 7 Min. load 1% 115 130 115 130 115 130 115 130 %
C
o ext Admissible capacitive load 3 4000 680 470 180 µF
u
o d Dynamic Voltage deviat.
U
i nom ±250 ±680 ±750 ±900 mV
t
dload Recovery time
I
o nom ↔ 1/2
I
o nom 1111ms
regulation
aUo Temperature coefficient
U
i min...
U
i max ±0.02 ±0.02 ±0.02 ±0.02 %/K
D
U
o/D
T
C
I
o = 0...
I
o max
1Flexible load distribution: Each output is capable of delivering 75% of
P
o nom according to table:
Type Survey
. The other output should
not exceed the difference to the total output power
P
o nom.
2The current limit is primary side controlled.
3Measured with both outputs connected in parallel.
4Conditions for specified output. Other output loaded with constant
current
I
o = 0.5
I
o nom.
5BW = 20 MHz
6Measured with a probe according to EN 61204
7The overvoltage protection is not tracking with R/Trim control.
Thermal Considerations
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated maxi-
mum ambient temperature
T
A max (see table:
Temperature
specifications
) and is operated at its nominal input voltage
and output power, the case temperature
T
C measured at the
Measuring point of case temperature
T
C (see:
Mechanical
Data
) will approach the indicated value
T
C max after the
warm-up phase. However, the relationship between
T
A and
T
C 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.
T
A max is therefore only an indica-
tive value and under practical operating conditions, the am-
bient temperature
T
A may be higher or lower than this value.
Caution: The case temperature
T
C measured at the
Measuring point of case temperature
T
C (see:
Mechani-
cal Data
) may under no circumstances exceed the speci-
fied maximum value. The installer must ensure that un-
der all operating conditions
T
C remains within the limits
stated in the table:
Temperature specifications.
Overtemperature Protection
The converters are protected from possible overheating by
means of an internal temperature monitoring circuit. It shuts
down the unit above the internal temperature limit and at-
tempts to automatically restart every 50 to 60 ms. This fea-
ture prevents from excessive internal temperature building
up which could occur in heavy overload conditions.
Connection in Series
The outputs of one or several single or double output units
can be connected in series without any precautions, taking
into consideration that the highest output voltage should
remain below 42 V to ensure that the output remains SELV.
Connection in Parallel
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.
Short Circuit Behaviour
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).
Output Overvoltage Protection
The output of single output units as well as -0503- and
-05-05- types are protected against overvoltages by a sec-
ond control loop. In the event of an overvoltage on one of
the outputs the unit will shut down and attempt to restart
approximately every 50 to 60 ms. Double and dual output
units (with exception of the -0503- and -05-05- types) are
protected against overvoltages by a Zener diode across the
second output. Under worst case conditions the Zener di-
ode will short circuit. Since with double output units both
outputs track each other the protection diode is only pro-
vided 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 to withstand
externally applied overvoltages.