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STA518A

10/14

4

THERMAL INFORMATION:

The power dissipated within the device depends primarly on the supply voltage, load impedance and output

modulation level. The PSSO36 Package of the STA518A includes an exposed thermal slug on the top of the

device to provide a direct thermal path from the IC to the heatsink.

For the Quad single ended application the Dissipated Power vs Ouptut Power is shown in fig.11

Considering that for the STA518A the Thermal resistance Junction to slug is 1.5°C/W and the extimated

Thermal resistance due to the grease placed between slug and heat sink is 2.3°C/W ( the use of thermal

pads for this package is not recommended), the suitable Heat Sink Rth to be used can be drawn from the

following graph fig 12, where is shown the Derating Power vs.Tambient for different heatsinkers.

5

CHARACTERIZATION CURVES

5.1 The following characterization are obtained using the quad single ended configuration (fig.2)

with STA308A controller

Figure 11. Power Dissipation vs Output Power

Figure 12. Power Derating Curve

Figure 13. THD+N vs Output Power

Figure 14. Output Power vs Supply Voltage

0

2

4

6

8

10

12

14

16

0

4

8

12

16

20

24

Vcc=30V

Rl=4ohm

F =1Kz

4 x Pout (W)

Pd (W)

5

10

15

20

25

0

20

40

60

80

100 120 140 160

Pd(W)

Tambient(C)

1)Infinite

2) 1.5 C/W

3) 3 C/W

4) 4.5 C/W

5) 6 C/W

2

3

1

4

5

5

10

15

20

25

0

20

40

60

80

100 120 140 160

Pd(W)

Tambient(C)

1)Infinite

2) 1.5 C/W

3) 3 C/W

4) 4.5 C/W

5) 6 C/W

2

3

1

4

5

0.1

10

0.2

0.5

1

2

5

THD(%)

100m

30

200m

500m

1

2

5

10

20

Pout(W)

Vcc = 26V

Rl = 4 ohm

F = 1KHz

Single Ended

2.5

30

5

7.5

10

12.5

15

17.5

20

22.5

25

27.5

Pout(W)

+10

+30

+12

+14

+16

+18

+20

+22

+24

+26

+28

Vdc

Rl=4 ohm

F=1KHz

Single Ended

THD=10%

THD=1%

2.5

30

5

7.5

10

12.5

15

17.5

20

22.5

25

27.5

Pout(W)

+10

+30

+12

+14

+16

+18

+20

+22

+24

+26

+28

Vdc

Rl=4 ohm

F=1KHz

Single Ended

THD=10%

THD=1%