GS-R51212S datasheet(7/8 Pages) STMICROELECTRONICS

7 / 8 page

Figure 3 - Typical Application.

Inhibit/Enable Input

The Inhibit/Enable function allows the ON/OFF

logic control of the module.

The converter is ON (Enable) when the voltage

applied to pin 2 (EN.) and referred to pin 1 (GND

IN) is lower than 0.8V (TTL, CMOS, open collector

compatible level).

The converter is OFF (Inhibit) when pin 2 is uncon-

nected or the voltage applied is in the range of 1.2V

to +Vin. Maximum sinking current is 1mA.

Module Protection

The module is protected against occasional and

permanent short-circuits of the output pins to

ground, as well as against output current overload.

The main output (+5.1V) uses a foldback current

limiting; the output current decreases with increas-

ing overload, reaching a minimum at short-circuit

condition.

This solution minimizes internal power dissipation.

The auxiliary outputs (

±12V or ±15V) use a current

limiting protection circuitry.

Thermal characteristics

Sometimes the GS-R51212S and GS-R51515S re-

quire an external heat-sink depending on both op-

erating temperature conditions and power.

Before entering into calculations details, some ba-

sic concepts will be explained to better understand

the problem.

The thermal resistance between two points is rep-

resented by their temperature difference in front of

a specified dissipated power, and it is expressed in

Degree Centigrade per Watt (

°C/W).

For the modules the thermal resistance case to

ambient is 7.5

°C/W. This means that an internal

power dissipation of 1W will bring the case tempera-

ture at 7.5

°C above the ambient temperature.

The maximum case temperature is 85

°C.

Let’s suppose to have a GS-R51515S that delivers

the maximum output power of 31.4W at an ambient

temperature of 40

°C.

7/8

GS-R51212S/GS-R51515S

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