tfa9841j-n1 NXP Semiconductors, tfa9841j-n1 Datasheet - Page 12

• Manufacturer Part Number: tfa9841j-n1
• Description: 1-channel Audio Amplifier
• Manufacturer: NXP Semiconductors

Philips Semiconductors
14. Test information
9397 750 12014
Preliminary data
14.1 Quality information
At V
see
For T
150
This calculation is for an application at worst-case 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.
Fig 13. Junction temperature as function of supply voltage for various loads.
P
R
R
P
R
R
th(tot)
th(h-a)
th(tot)
th(h-a)
CC
Figure
j(max)
External heatsink of 10 K/W; with music signals; T
R
R
60 = 90 C:
= 18 V and R
th(tot)
th(tot)
8.2.2). This allows for the use of a smaller heatsink:
= 90/4.4 = 20.5 K/W
= 90/2.2 = 40.9 K/W
= R
= R
= 150 C the temperature raise, caused by the power dissipation, is:
9.
= 90 C
= 90 C
th(tot)
th(tot)
Rev. 01 — 06 February 2004
R
R
L
th(j-mb)
th(j-mb)
= 4
( C)
150
100
T j
50
0
8
= 20.5
= 40.9
the measured worst-case sine-wave dissipation is 4.4 W;
R L = 1
12
4.0 = 16.5 K/W.
4.0 = 36.9 K/W.
2
16
amb
3
20
= 25 C.
1-channel audio amplifier (1 x SE)
24
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
4
8
V CC (V)
MDB800
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TFA9841J
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