24IMS15 データシートの表示（PDF） - Bel Fuse Inc.

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24IMS15

15 Watt DC-DC Converters

Bel Fuse Inc. 

IMX15, IMY15, IMS15 Series Data Sheet

15 Watt DC-DC Converters

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.

Po/Po max

JM017

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

Vo [%]

100

70

overload condition

switch-off

05041c

t

0

0.3 s

Fig. 8

Overload switch-off (hiccup mode); typical values

1.0

0.8

0.5 m/s = 100 LFM

0.6

natural cooling

0.4

0.2

0

Fig. 7

20 40 60

80 100 °C TA

Maximum output power versus ambient temperature

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.

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.

V

5.5

05166a

5.0

4.5

4.0

3.5

3.0

0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4 A

Fig. 9

Vo versus Io (typ) of converters with Vo = 5.1 V

(110IMY15-05-8R)

BCD20008-G Rev AE, 25-Aug-2017

MELCHER

The Power Partners.

Page 11 of 19

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