tfa9843j-02 NXP Semiconductors, tfa9843j-02 Datasheet - Page 16

• Manufacturer Part Number: tfa9843j-02
• Description: Tfa9843j 2-channel Audio Amplifier Se 1 W To 20 W Or Btl 4 W To 40 W
• Manufacturer: NXP Semiconductors

Philips Semiconductors
14. Test information
9397 750 12587
Preliminary data
Fig 22. Junction temperature versus supply voltage.
2
music signals.
(˚C)
SE loads; T
150
100
T j
50
0
8
R L = 2
amb
12
14.1 Quality information
= 25 C; external heatsink of 10 K/W;
16
4
At V
is 8.4 W; see
power dissipation, is: 150
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
Section
The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
P
R
R
P
R
R
th(tot)
th(h-a)
th(tot)
th(h-a)
CC
20
6
R
R
= 18 V and R
th(tot)
th(tot)
8.2.2). This allows for the use of a smaller heatsink:
= 90/8.4 = 10.7 K/W
= 90/4.2 = 21.4 K/W
= R
= R
16
8
24
= 90 C
= 90 C
th(tot)
th(tot)
Figure
V CC (V)
MCE504
Rev. 02 — 19 January 2004
28
R
R
L
13. For T
th(j-mb)
th(j-mb)
= 4
60 = 90 C:
= 10.7
= 21.4
(2
j(max)
Fig 23. Junction temperature versus supply voltage.
SE) the measured worst-case sine-wave dissipation
BTL loads; T
music signals.
= 150 C the temperature raise, caused by the
2.0 = 8.7 K/W
2.0 = 19.4 K/W
(˚C)
2-channel audio amplifier (2 x SE or 1 x BTL)
150
T j
100
50
0
8
R L = 1
amb
12
= 25 C; external heatsink of 10 K/W;
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
16
2
20
3
TFA9843J
4
8
24
V CC (V)
MCE505
28
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