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PDF TDA8948J Data sheet ( Hoja de datos )
| Número de pieza | TDA8948J | |
| Descripción | 4-channel audio amplifier | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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TDA8948J
4-channel audio amplifier
Rev. 01 — 27 February 2008
www.DataSheet4U.com
Product data sheet
1. General description
The TDA8948J contains four identical audio power amplifiers. The TDA8948J 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 TDA8948J comes in a 17-pin Dil-Bent-Sil (DBS) power package. The TDA8948J is
pin compatible with the TDA8944AJ, TDA8946AJ and TDA8947J.
The TDA8948J 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 heat sink and ambient temperature) allow
it.
2. Features
2.1 Functional features
I SE: 1 W to 18 W, BTL: 4 W to 36 W operation possibility (2.1 system)
Soft clipping.
I Standby and mute mode.
I No on/off switching plops.
I Low standby current.
I High supply voltage ripple rejection.
I Outputs short-circuit protected to ground, supply and across the load.
I Thermally protected.
I Pin compatible with TDA8944AJ, TDA8946AJ and TDA8947J.
3. Applications
I Television
I PC speakers
I Boom box
I Mini and micro audio receivers
1 page  
NXP Semiconductors
TDA8948J
www.Data
4-channel audio amplifier
Table 3.
Symbol
GND2
VCC2
OUT4+
Pin description …continued
Pin Description
15 ground of channels 3 and 4
16 supply voltage channels 3 and 4
17 non inverted loudspeaker output of channel 4
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 TDA8948J 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
TDA8948J_1
Product data sheet
Rev. 01 — 27 February 2008
© NXP B.V. 2008. All rights reserved.
5 of 26
5 Page 
NXP Semiconductors
TDA8948J
www.DataSheet4U.com
4-channel audio amplifier
30
Po(max)
(W)
20
10
107
Vo
(µV)
106
coc005
105
104
103
102
10
1
0 4 8 12 16 20
VMODE1 (V)
a. BTL; VCC = 17 V; Vi = 50 mV.
Fig 4. AC output voltage as a function of voltage on pin MODE1
010aaa111
(2) (3) (4)
(1) (5)
60
Po(max)
(W)
40
20 (5)
010aaa112
(4) (3)
(2)
(1)
0
8 12 16 20 24 28
VP (V)
0
8 12 16 20 24 28
VP (V)
fi =1 kHz
(1) 1 Ω SE at THD = 10 %
(2) 2 Ω SE at THD = 10 %
(3) 3 Ω SE at THD = 10 %
(4) 4 Ω SE at THD = 10 %
(5) 8 Ω SE at THD = 10 %
fi = 1 kHz
(1) 16 Ω BTL at THD = 10 %
(2) 8 Ω BTL at THD = 10 %
(3) 6 Ω BTL at THD = 10 %
(4) 4 Ω BTL at THD = 10 %
(5) 2 Ω BTL at THD = 10 %
a. SE: THD = 10 %; one channel
b. BTL: THD = 10 %; one channel
Fig 5. Maximum output power as a function of supply voltage at various loads
TDA8948J_1
Product data sheet
Rev. 01 — 27 February 2008
© NXP B.V. 2008. All rights reserved.
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