IMS7 datasheet(8/14 Pages) BEL

8 / 14 page

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015

Page 8 of 14

MELCHER

The Power Partners.

Thermal Considerations

If the 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 (see Mechanical Data) will approach 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, such as 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, TA may be higher or lower.

Caution: The case temperature TC measured at the measuring

point of case temperature (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.

Fig. 8a

Vo versus Io (typ.) of single-output models with Vo = 5.1 V

Fig. 8b

Vo versus Io (typ.) of double-output models (2

×12 V) with both

outputs in parallel

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 overvoltage 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 overvoltage, 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 or Parallel

The outputs of single- or double-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.

Both outputs of double-output models can be connected in

parallel without any precautions. Several converters (single- or

double-output models) with equal output voltage can be put 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.

Fig. 7

Overload switch-off (hiccup mode).

5.5

5.0

4.5

4.0

3.5

3.0

0.4

0.8

1.2

1.6

o [A]

o [V]

05087a

1.0

0.8

0.6

0.4

0.2

100

°C

o /Po max

JM017

0.5 m/s = 100 LFM

natural cooling

100

o [%]

05041b

0.3 s

overload short-circuit condition

switch-off

Fig. 6

Maximum allowed output power versus ambient temperature

o [V]

0.2

0.4

0.6

0.8

o total

[A]

05086b

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