TFA9842AJ Philips, TFA9842AJ Datasheet - Page 13

• Manufacturer Part Number: TFA9842AJ
• Description: 7.5W Stereo Power Amplifier
• Manufacturer: Philips

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Philips Semiconductors
14. Test information
TFA9842AJ_1
Preliminary specification
14.1 Quality information
At V
8.4 W; see
dissipation, is: 150 C
This calculation is for an application at worst-case (stereo) sine-wave output signals. In
practice music signals will be applied, which decreases the maximum power dissipation to
approximately half of the sine-wave power dissipation (see
the use of a smaller heatsink:
The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
Fig 16. Junction temperature as function of supply voltage
R
P
R
R
P
R
R
th(tot)
th(tot)
th(h-a)
th(tot)
th(h-a)
CC
R
R
= 17 V and R
th(tot)
th(tot)
2
= (T
= 90/8.4 K/W = 10.7 K/W
= 90/4.2 K/W = 21.4 K/W
= R
= R
Figure
SE loads; T
j(max)
= 90 C
= 90 C
th(tot)
th(tot)
8. For T
R
R
T
L
amb
amb(max)
th(j-mb)
th(j-mb)
= 4
( C)
150
100
T
Rev. 01 — 28 April 2006
50
= 25 C; external heatsink of 10 K/W; music signals
60 C = 90 C:
j
0
8
j(max)
= 10.7 K/W
= 21.4 K/W
(2
)/P
R L = 2
= 150 C the temperature raise, caused by the power
12
SE) the measured worst-case sine-wave dissipation is
7.5 W stereo power amplifier with volume control
16
2.0 K/W = 8.7 K/W
2.0 K/W = 19.4 K/W
4
20
6
24
001aaa449
16
8
V
CC
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Section
(V)
28
TFA9842AJ
8.2.2). This allows for
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