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PDF TFA9842J Data sheet ( Hoja de datos )
| Número de pieza | TFA9842J | |
| Descripción | 2-channel audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TFA9842J
2-channel audio amplifier; SE: 1 W to 7.5 W; BTL: 2 W to 15 W
Rev. 01 — 26 April 2004
Preliminary data
1. General description
The TFA9842J contains two identical audio power amplifiers. The TFA9842J 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 TFA9842J comes in a 9-pin DIL-bent-SIL (DBS9P) power package. The
TFA9842J is pin compatible with the TFA9841J and TFA9843J.
The TFA9842J 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 7.5 W; BTL: 2 W to 15 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 TFA9841J and TFA9843J.
3. Applications
s Television
s PC speakers
s Boom box
s Mini and micro audio receivers.
1 page  
Philips Semiconductors
TFA9842J
2-channel audio amplifier (2 x SE or 1 x BTL)
• 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 Ω
and for BTL of 16 Ω is required for VCC > 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:
Po(ALL, SE) = 5--1---5⋅---.1-8--0-5--3- = 315 mW
(4)
Po(ALL, BTL) = 1---1-0--5--⋅-.--81---50---3- = 630 mW
(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).
Table 4: Power rating as function of headroom
Headroom
Power output
SE BTL
0 dB
12 dB
Po = 5 W
Po = 10 W
Po(ALL) = 315 mW Po(ALL) = 630 mW
Power dissipation
(both channels driven)
PD = 8.4 W
PD = 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 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 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 12013
Preliminary data
Rev. 01 — 26 April 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
5 of 21
5 Page 
Philips Semiconductors
TFA9842J
2-channel audio amplifier (2 x SE or 1 x BTL)
10
THD+N
(%)
1
MCE489
10
THD+N
(%)
1
MCE490
10−1
10−1
10−2
10
102 103 104 105
f (Hz)
10−2
10
102 103
VCC = 17 V; Po = 1 W; RL = 4 Ω.
a. SE.
VCC = 17 V; Po = 1 W; RL = 8 Ω.
b. BTL.
Fig 8. Total harmonic distortion-plus-noise as function of frequency.
104 105
f (Hz)
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; RL = 4 Ω.
a. SE.
VCC = 18 V; RL = 8 Ω.
b. BTL.
Fig 9. Total power dissipation as function of channel output power per channel (worst case, both channels
driven).
9397 750 12013
Preliminary data
Rev. 01 — 26 April 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
11 of 21
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| PDF Descargar | [ Datasheet TFA9842J.PDF ] | |
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