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PDF TDA8947J Data sheet ( Hoja de datos )
| Número de pieza | TDA8947J | |
| Descripción | 4-channel audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8947J
4-channel audio amplifier
Rev. 02 — 16 June 2005
Product data sheet
1. General description
The TDA8947J contains four identical audio power amplifiers. The TDA8947J can be used
as: four Single-Ended (SE) channels with a fixed gain of 26 dB, two times Bridge-Tied
Load (BTL) channels with a fixed gain of 32 dB or two times SE channels (26 dB gain)
plus one BTL channel (32 dB gain) operating as a 2.1 system
The TDA8947J comes in a 17-pin Dil-Bent-Sil (DBS) power package. The TDA8947J is
pin compatible with the TDA8944AJ and TDA8946AJ.
The TDA8947J 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 25 W, BTL: 4 W to 50 W operation possibility (2.1 system)
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 TDA8944AJ and TDA8946AJ
3. Applications
s Television
s PC speakers
s Boom box
s Mini and micro audio receivers
1 page  
Philips Semiconductors
TDA8947J
4-channel audio amplifier
Table 3:
Symbol
VCC2
OUT4+
TAB
Pin description …continued
Pin Description
16 supply voltage channels 3 and 4
17 non inverted loudspeaker output of channel 4
- back side tab or heat spreader has to be connected to ground
8. Functional description
8.1 Input configuration
The input cut-off frequency is:
f i(cut – off ) = 2----π---(---R---1-i---×----C-----i-)-
For SE application Ri = 60 kΩ and Ci = 220 nF:
f i(cut – off ) = -2---π---(---6---0----×-----1---0---3---1-×-----2---2---0----×-----1---0---–---9--)- = 12 Hz
(1)
(2)
For BTL application Ri = 30 kΩ and Ci = 470 nF:
f i(cut – off ) = -2---π---(---3---0----×-----1---0---3---1-×-----4---7---0----×-----1---0---–---9--)- = 11 Hz
(3)
As shown in Equation 2 and Equation 3, large capacitor values for the inputs are not
necessary, so the switch-on delay during charging of the input capacitors can be
minimized. This results in a good low frequency response and good switch-on behavior.
8.2 Power amplifier
The power amplifier is a BTL and/or SE amplifier with an all-NPN output stage, capable of
delivering a peak output current of 4 A.
Using the TDA8947J as a BTL amplifier offers the following advantages:
• Low peak value of the supply current
• Ripple frequency on the supply voltage is twice the signal frequency
• No expensive DC-blocking capacitor
• Good low frequency performance
9397 750 14938
Product data sheet
Rev. 02 — 16 June 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
5 of 24
5 Page 
Philips Semiconductors
TDA8947J
4-channel audio amplifier
107
Vo
(µV)
106
coc005
105
104
103
102
10
1
0 4 8 12
BTL; VCC = 18 V; Vi = 50 mV.
Fig 4. AC output voltage as function of voltage on pin MODE1
16 20
VMODE1 (V)
60
mce485
60
mce484
Po Po
(W) (W)
4Ω 6Ω
40 40
8Ω
20
RL = 1 Ω
0
8 12 16
2Ω 3Ω
4Ω
8Ω
20 24
28
VCC (V)
20 RL = 2 Ω
16 Ω
0
8 12 16 20 24 28
VCC (V)
THD = 10 %; one channel.
THD = 10 %; one channel.
a. SE
b. BTL
Fig 5. Output power as function of supply voltage at various loads
9397 750 14938
Product data sheet
Rev. 02 — 16 June 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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