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K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
Thermal Considerations
If a converter is located in free, quasi-stationary air
(convection cooling) at the indicated maximum ambient
temperature T A max (see table: Temperature specifications)
and is operated at its nominal input voltage and output
power, the temperature 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 integration into a
system. The thermal conditions are influenced by input
voltage, output current, airflow, and temperature of
surrounding components and surfaces. T A max is therefore,
contrary to T C max , an indicative value only.
Caution: The installer must ensure that under all operating
conditions T C remains within the limits stated in the table:
Temperature specifications.
Notes: Sufficient forced cooling or an additional heat sink
(applied to -7 or -9) models allows T A to be higher than 71 °C
(e.g., 85 °C), if T C max is not exceeded. Details are specified
in fig. 12, including -5 and -6 models.
Output Protection
Each output is protected by a suppressor diode against
overvoltage, which could occur due to a failure of the
control circuit. In such a case, the suppressor diode
becomes a short circuit. The suppressor diodes may
smooth short overvoltages resulting from dynamic load
changes, but they are not designed to withstand externally
applied overvoltages.
A short circuit at any of the two outputs will cause a
shutdown of the other output. A red LED indicates any
overload condition.
Note: V o BR is specified in Electrical Output Data . If this
voltage is exceeded, the suppressor diode generates losses
and may become a short circuit.
Parallel or Series Connection of Converters
Single- or double-output models with equal output voltage
can be connected in parallel without any precautions using
option T (current sharing). If the T pins are interconnected,
all converters share the output current equally.
Single-output models and/or main and second outputs of
I o / I o nom
1.0
0.8
convection cooling
forced cooling
-5 -6 -7
double-output models can be connected in series with any
other (similar) output.
Notes:
– Parallel connection of double-output models should always
include both, main and second output to maintain good
0.6
0.4
-5
-6
-7
T C max
regulation.
– Not more than 5 converters should be connected in parallel.
– Series connection of second outputs without involving their
0.2
main outputs should be avoided, as regulation may be poor.
0
50
60
70
80
90
T A
100 °C
– Series connection of outputs totalizing more than 36 V
nominal voltage need additional measures to limit the output
to SELV (Safe Extra Low Voltage).
Fig. 12
Output current derating versus temperature for -5, -6, and
-7 (equal to -9) models.
Thermal Protection
A temperature sensor generates an internal inhibit signal,
which disables the outputs, when the case temperature
exceeds T C max . The outputs automatically recover, when
the temperature drops below this limit.
Continuous operation under simultaneous extreme worst-
case conditions of the following three parameters should
be avoided: Minimum input voltage, maximum output
power, and maximum temperature.
– The maximum output current is limited by the output with the
lowest current limitation, if several outputs are connected in
series.
BCD20001-G Rev AC, 16-Dec-2010
Page 11 of 29
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