IMX4 datasheet(7/12 Pages) BEL

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IMX4 Series Data Sheet

4 Watt DC-DC Converters

BCD20006-G Rev AE, 16-Sep-2015

Page 7 of 12

MELCHER

The Power Partners.

Thermal Considerations

If a converter, mounted on a PCB, is located in free, quasi-

stationary air (convection cooling) at the maximum ambient

temperature TA max (see table Temperature specifications)

and is operated at 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 integration into a system. The

thermal conditions depend on 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, and under practical

operating conditions, the ambient temperature TA may be

higher or lower.

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. The installer must

ensure that under all operating conditions TC remains within the

limits stated in the table Temperature Specifications.

Short Circuit Behavior

The current limitation shuts down the converter, when a short

circuit is applied to the output. It acts self-protecting, and

automatically recovers after removal of the overload condition.

Output Overvoltage Protection

The outputs are protected against overvoltages by Zener

diodes. In the event of an overvoltage, the converter will shut-

down and attempt to restart automatically. The main purpose

of this feature is to protect against possible overvoltages,

which could occur due to a failure in the feedback control

circuit. The converters are not designed to withstand external

overvoltages applied to the outputs.

Connection in Series

The outputs of single or dual-output models can be connected

in series without any precautions, taking into consideration

that the output voltage should remain below 60 V for SELV

operation.

Fig. 9

Overload switch-off (hiccup mode).

100

Vo [%]

t [ms]

05041a

0.3 s

overload short circuit condition

switch-off

Connection in Parallel

Several converters with equal output voltage can be

connected in parallel and will share their output current quite

equally. However, this may cause start-up problems and is only

recommended in applications, where one converter is able to

deliver the full load current, e.g., in true redundant systems.

Typical Performance Curves

Fig. 10

Vo versus Io (typ) of single-output models (20IMX4-05)

Fig. 11

Vo versus Io (typ.) of dual-output models (±15 V), with load

connected between Vo+ and Vo –.

Fig. 12

Cross load regulation of dual-output models. Vo1 versus Io1

(typ) for various Io2 (40IMX4-1515).

14.5

15.5

16.5

Vo1 [V]

100

120

140 mA

Io1

Io2 = 140 mA

Io2 = 14 mA

05058a

5.25

5.0

4.75

4.5

4.25

4.0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 A

Vo [V]

05056b

28.5

29.5

30.5

31.5

Vo1 + Vo2 [V]

100

120

140 mA

05057a

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