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TFA9842J Datasheet(Fiches technique) 16 Page - NXP Semiconductors

Numéro de pièce TFA9842J
Description  2-channel audio amplifier; SE: 1 W to 7.5 W; BTL: 2 W to 15 W
Télécharger  21 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
TFA9842J
2-channel audio amplifier (2 x SE or 1 x BTL)
Preliminary data
Rev. 01 — 26 April 2004
16 of 21
9397 750 12013
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
At VCC =18V and RL =4 Ω (2 × SE) the measured worst-case sine-wave dissipation
is 8.4 W; see Figure 9.
For Tj(max) = 150 °C the temperature raise, caused by the power dissipation, is:
150
− 60=90 °C:
P
× R
th(tot) =90 °C
Rth(tot) = 90/8.4 = 10.7 K/W
Rth(h-a) =Rth(tot) − Rth(j-mb) = 10.7 − 2.0 = 8.7 K/W.
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 8.2.2). This allows for the use of a smaller heatsink:
P
× R
th(tot) =90 °C
Rth(tot) = 90/4.2 = 21.4 K/W
Rth(h-a) =Rth(tot) − Rth(j-mb) = 21.4 − 2.0 = 19.4 K/W.
14. Test information
14.1 Quality information
The
General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
External heatsink of 8 K/W; with music signals;
Tamb =25 °C.
External heatsink of 8 K/W; with music signals;
Tamb =25 °C.
a.
SE.
b.
BTL.
Fig 15. Junction temperature as function of supply voltage for various loads.
8
150
100
50
0
12
28
VCC (V)
16
20
24
MDB808
Tj
(
°C)
4
RL = 2 Ω
6
8
16
8
150
100
50
0
12
28
VCC (V)
16
20
24
MDB807
Tj
(
°C)
2
RL = 1 Ω
3
4
8




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