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TFA9843J Datasheet(Fiches technique) 5 Page - NXP Semiconductors

Numéro de pièce TFA9843J
Description  2-channel audio amplifier (SE: 1 W to 20 W or BTL: 4 W to 40 W)
Télécharger  21 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
TFA9843J
2-channel audio amplifier (2 x SE or 1 x BTL)
Preliminary data
Rev. 02 — 19 January 2004
5 of 21
9397 750 12587
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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 11. The maximum output power is limited by the supply
voltage of 26 V and the maximum available output current is 4 A repetitive peak
current. A minimum load (SE) of 3
Ω is required for supply voltages > 22 V; see
Figure 5. A minimum load (BTL) of 6
Ω is required for supply voltages > 22 V; see
Figure 6.
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 13 (SE) or Figure 14 (BTL) for 0 dB
respectively 12 dB headroom (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 TFA9843J 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 (THD = 0.2 %)
Power dissipation (PD);
both channels driven
SE
BTL
0dB
Po =5W
Po =10W
8.4 W
12 dB
Po(ALL) = 315 mW
Po(ALL) = 630 mW
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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