STCS2

Application information

11/16

basing on this and on the thermal resistance and ambient temperature, the junction

temperature can be calculated as:

A typical application could be:

– Input Voltage: 12 V;

– LEDs current: 1000 mA;

– Package: Power SO-10;

In this case the drain voltage is given by:

end the power dissipated in the IC is the following:

With a thermal resistance junction-ambient equal to 12 °C/W the junction temperature is:

The following pictures show the maximum power dissipation according to the ambient

temperature:

Figure 12.

0.00

2.00

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12.00

25

35

45

55

65

75

85

95 105 115 125

[°C]

12

35

R

P

0.00

2.00

4.00

6.00

8.00

10.00

12.00

25

35

45

55

65

75

85

95 105 115 125

[°C]

12

35

R

P