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TDA8922C Datasheet(PDF) 19 Page - NXP Semiconductors

Part No. TDA8922C
Description  2 X 75 W class-D power amplifier
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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TDA8922C Datasheet(HTML) 19 Page - NXP Semiconductors

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TDA8922C_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 7 September 2009
19 of 40
NXP Semiconductors
TDA8922C
2
× 75 W class-D power amplifier
Equation 5 defines the relationship between maximum power dissipation before activation
of TFB and total thermal resistance from junction to ambient.
(5)
Power dissipation (P) is determined by the efficiency of the TDA8922C. Efficiency
measured as a function of output power is given in Figure 20. Power dissipation can be
derived as a function of output power as shown in Figure 19.
(1) Rth(j-a) = 5 K/W.
(2) Rth(j-a) = 10 K/W.
(3) Rth(j-a) = 15 K/W.
(4) Rth(j-a) = 20 K/W.
(5) Rth(j-a) = 35 K/W.
Fig 9.
Derating curves for power dissipation as a function of maximum ambient
temperature
R
th ja
()
T
j
T
amb
P
------------------------
=
P
(W)
30
20
10
0
Tamb (°C)
(1)
(2)
(3)
(4)
(5)
0
20
100
40
60
80
mbl469


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