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IMX15 Datasheet(PDF) 11 Page - Bel Fuse Inc.

Part # IMX15
Description  15 Watt DC-DC Converters
Download  19 Pages
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Manufacturer  BEL [Bel Fuse Inc.]
Direct Link  http://www.belfuse.com
Logo BEL - Bel Fuse Inc.

IMX15 Datasheet(HTML) 11 Page - Bel Fuse Inc.

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IMX15, IMY15 , IMS15 Series Data Sheet
15 Watt DC-DC Converters
BCD20008-G Rev AE, 25-Aug-2017
Page 11 of 19
MELCHER
The Power Partners.
Thermal Considerations
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated maximum
ambient
temperature
TA max
(see
table
Temperature
specifications) and is operated at its nominal input voltage and
output power, the case temperature 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 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.
Caution: The case temperature TC measured at the measuring
point of case temperature TC (see Mechanical 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.
Overtemperature Protection
The converters are protected from possible overheating by
means of an internal temperature monitoring circuit. It shuts
down the converter above the internal temperature limit, and
attempts to automatically restart in short intervals. This feature
helps protect against excessive internal temperatures, which
could occur during heavy overload conditions.
Output Overvoltage Protection
The output of single-output models as well as -0503- and -05-
05-models are protected against overvoltage by a second
control loop. In the event of an overvoltage on one of the
outputs, the converter will shut down and attempt to restart in
short intervals.
Doubel-output models (except -0503- and -05-05-models) are
protected against overvoltage by a Zener diode across the
second output. Under worst case conditions the Zener diode
will become a short circuit. Since with double-output models
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 overvoltage, which could
occur due to a failure in the control logic. This protection circuit
is not designed to withstand externally applied overvoltages.
Fig. 9
Vo versus Io (typ) of converters with Vo = 5.1 V
(110IMY15-05-8R)
5.5
5.0
4.5
4.0
3.5
3.0
00.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6
4 A
V
05166a
Fig. 8
Overload switch-off (hiccup mode); typical values
1.0
0.8
0.6
0.4
0
0.2
20
40
60
80
100
°C
P
o /Po max
JM017
T
A
0.5 m/s = 100 LFM
natural cooling
Short Circuit Behavior
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).
Parallel and Series Connection
The outputs of one or several single- or double-output models
Fig. 7
Maximum output power versus ambient temperature
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.
Both outputs of the same converter with equal voltage (e.g. 5 V
/ 5 V) can be connected in parallel and will share their output
currents 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, for example, required in true redundant
systems.
Note: If the 2nd output of double-output models (except 0503) is not
used, connect it in parallel to the 1st output.
Typical Performance Curves
General conditions:
– TA = 25 ºC, unless TC is specified.
– Shutdown pin left open-circuit.
– Trim or R input not connected.
70
100
V
o [%]
t
05041c
0.3 s
overload condition
switch-off
0


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