33288 데이터 시트보기 (PDF) - Freescale Semiconductor

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33288

Solid State Relay for Automotive Flasher Applications

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Transient Thermal Model

A more complete model including thermal capacitance is

proposed in Figure 3.

30

5mJ/K

5mJ/K

MOS1 3K/W

1mJ/K

4mJ/K

MOS2 MOS3 3.5K/W

Control

3K/W

450K/W

3K/W

Case

3.5K/W

0.5J/K

Ambiant

3K/W

Board

20K/W

6J/K

300K/W

Figure 5. Transient Thermal Model

This gives a thermal impedance versus time (Figure 4),

which has been determined with the printed circuit board

shown in Figure 1.

20

10

0

0

100 200 300 400 500 600 700 800

Time (sec.)

Figure 6. Junction to Ambiant Thermal Impedance

This figure shows that the steady state is reached after

about 10 minutes. It also clearly shows that the device can

dissipate almost twice the power within one minute compared

to the maximum allowed power dissipation in steady state.

33288

10

Analog Integrated Circuit Device Data

Freescale Semiconductor

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