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TFA9842J Datasheet(Fiches technique) 5 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
5 of 21
9397 750 12013
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Ripple frequency on the supply voltage is twice the signal frequency
No expensive DC-blocking capacitor
Good low frequency performance.
8.2.1
Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10 %; see Figure 6.
The maximum output power is limited by the supply voltage of 26 V and the maximum
available output current is 3 A (repetitive peak current). A minimum load for SE of 4
and for BTL of 16
Ω is required for V
CC > 22 V; see Figure 5.
8.2.2
Headroom
Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom,
compared to the average power output, for transferring the loudest parts without
distortion. At VCC = 18 V and Po = 5 W (SE with RL =4 Ω) or Po = 10 W (BTL with
RL =8 Ω) at THD = 0.2 % (see Figure 7), the Average Listening Level (ALL) music
power without any distortion yields:
(4)
(5)
The power dissipation can be derived from Figure 9 (SE and BTL) for a headroom of
0 dB and 12 dB, respectively (see Table 4).
For the average listening level a power dissipation of 4.2 W can be used for a
heatsink calculation.
8.3 Mode selection
The TFA9842J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE (see Table 5 and Figure 3).
Table 4:
Power rating as function of headroom
Headroom
Power output
Power dissipation
(both channels driven)
SE
BTL
0dB
Po =5W
Po =10W
PD = 8.4 W
12 dB
Po(ALL) = 315 mW
Po(ALL) = 630 mW
PD = 4.2 W
P
oALL SE
,
()
510
3
15.85
---------------
315 mW
==
P
o ALL BTL
,
()
10 10
3
15.85
------------------
630 mW
==
Table 5:
Mode selection
VMODE
Amplifiers 1 and 2
0 to 0.8 V
standby
4.5 V to (VCC − 3.5 V)
mute
(VCC − 2.0 V) to VCC
on




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