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PDF TFA9843J Data sheet ( Hoja de datos )
| Número de pieza | TFA9843J | |
| Descripción | 2-channel audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TFA9843J
2-channel audio amplifier (SE: 1 W to 20 W or BTL: 4 W to
40 W)
Rev. 02 — 19 January 2004
Preliminary data
1. General description
The TFA9843J contains two identical audio power amplifiers. The TFA9843J can be
used as two Single-Ended (SE) channels with a fixed gain of 26 dB or one
Bridge-Tied Load (BTL) channel with a fixed gain of 32 dB.
The TFA9843J comes in a 9-pin DIL-bent-SIL (DBS7P) power package. The
TFA9843J is pin compatible with the TFA9842J and TFA9841J.
The TFA9843J contains a unique protection circuit that is solely based on multiple
temperature measurements inside the chip. This gives maximum output power for all
supply voltages and load conditions with no unnecessary audio holes. Almost any
supply voltage and load impedance combination can be made as long as thermal
boundary conditions (number of channels used, external heatsink and ambient
temperature) allow it.
2. Features
s SE: 1 W to 20 W; BTL: 4 W to 40 W operation possibility
s Soft clipping
s Standby and mute mode
s No on/off switching plops
s Low standby current
s High supply voltage ripple rejection
s Outputs short-circuit protected to ground, supply and across the load
s Thermally protected
s Pin compatible with the TFA9842J and TFA9841J.
3. Applications
s Television
s PC speakers
s Boom box
s Mini and micro audio receivers.
1 page  
Philips Semiconductors
TFA9843J
2-channel audio amplifier (2 x SE or 1 x BTL)
• 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:
Po(ALL, SE) = 5---1--×-5---.-18---05---3- = 315 mW
(4)
Po(ALL, BTL) = 1----01---5-×--.--8-1--5-0---3- = 630 mW
(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).
Table 4: Power rating as function of headroom
Headroom
Power output (THD = 0.2 %)
SE BTL
0 dB
12 dB
Po = 5 W
Po = 10 W
Po(ALL) = 315 mW Po(ALL) = 630 mW
Power dissipation (PD);
both channels driven
8.4 W
4.2 W
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 5: Mode selection
VMODE
0 to 0.8 V
4.5 V to (VCC − 3.5 V)
(VCC − 2.0 V) to VCC
Amplifiers 1 and 2
standby
mute
on
9397 750 12587
Preliminary data
Rev. 02 — 19 January 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
5 of 21
5 Page 
Philips Semiconductors
TFA9843J
2-channel audio amplifier (2 x SE or 1 x BTL)
50
Po
(W)
40
MCE491
50
Po
(W)
40
MCE492
30 30
20 20
10
0
8 12 16 20 24 28
VCC (V)
THD = 10 %; SE; RL = 4 Ω; f = 1 kHz.
Fig 11. Output power as function of supply voltage.
10
0
8 12 16 20 24 28
VCC (V)
THD = 10 %; BTL; RL = 8 Ω; f = 1 kHz.
Fig 12. Output power as function of supply voltage.
10
PD
(W)
8
MCE507
10
PD
(W)
8
MCE508
66
44
22
0
04
8 12 16 20
Po (W)
0
0 4 8 12 16 20
Po (W)
VCC = 18 V; SE; RL = 4 Ω.
Fig 13. Total (worst case, both channels driven) power
dissipation as function of channel output power
per channel.
VCC = 18 V; BTL; RL = 8 Ω.
Fig 14. Total (worst case, both channels driven) power
dissipation as function of channel output power
per channel.
9397 750 12587
Preliminary data
Rev. 02 — 19 January 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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