IMX35 datasheet(7/16 Pages) BEL

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BCD20009-G Rev F, 20-Nov-2020

Page 7 of 16

IMX35 Series

35 Watt Quad-Output DC-DC Converter

Thermal Considerations

If a converter, mounted on a PCB, 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 case

temperature T

C (TC Z with option Z) measured at the measuring point of case temperature (see Mechanical Data) will approach the

indicated value T

C 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 the surfaces and properties of the printed circuit board. T

A max is therefore only an indicative value,

and under practical operating conditions, the ambient temperature T

A may be higher or lower than this value.

Caution: The case temperature T

C (or TC Z) measured at the measuring point of case temperature (see Mechanical Data) may under no

circumstances exceed the specified maximum value. The installer must ensure that under all operating conditions T

C (or TC Z) remains within

the limits stated in the table Temperature specifications.

The converters provide the specified output power with free air convection cooling. In the upper temperature range the output

power derating below should be observed.

1.0

0.8

0.6

0.4

0.2

100

°C

Po/Po max

11047-X35a

0.5 m/s = 100 LFM

natural cooling

Fig. 5

Maximum allowed output power versus ambient temperature (models with and without option Z)

Overtemperature Protection

The converter is protected against possible overheating by means of an internal temperature monitoring circuit located on the

primary side. It shuts down the converter above the internal temperature limit and attempts to restart automatically. This feature

prevents excessive internal temperature building up which could occur under overload conditions.

Short Circuit Behavior

The current limit characteristic shuts down the converter whenever a short circuit is applied to an output. It acts self-protecting and

automatically recovers after removal of the overload condition (hiccup mode).

100

Vo [%]

05041b

0.3 s

overload short-circuit condition

switch-off

Fig. 6

Overload switch off (hiccup mode), typical values.

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