Data Sheet

TDA8948J
4-channel audio amplifier
Rev. 01 — 27 February 2008
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
n SE: 1 W to 18 W, BTL: 4 W to 36 W operation possibility (2.1 system)
Soft clipping.
n Standby and mute mode.
n No on/off switching plops.
n Low standby current.
n High supply voltage ripple rejection.
n Outputs short-circuit protected to ground, supply and across the load.
n Thermally protected.
n Pin compatible with TDA8944AJ, TDA8946AJ and TDA8947J.
3. Applications
n
n
n
n
Television
PC speakers
Boom box
Mini and micro audio receivers
TDA8948J
NXP Semiconductors
4-channel audio amplifier
4. Quick reference data
Table 1.
Quick reference data
SE: VCC = 17 V; Tamb = 25 °C; RL = 4 Ω; fi = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test
circuit Figure 11; unless otherwise specified.
BTL: VCC = 17 V; Tamb = 25 °C; RL = 8 Ω; f = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test
circuit Figure 11; unless otherwise specified.
Symbol
Parameter
Conditions
supply voltage
VCC
Min
Typ
Max
Unit
operating
[1]
9
17
26
V
no (clipping signal)
[2]
-
-
28
V
[3]
-
100
145
mA
-
-
10
µA
THD = 10 %;
RL = 4 Ω
6.5
8
-
W
THD = 0.5 %;
RL = 4 Ω
-
6
-
W
-
12
-
W
14
16
-
W
-
12
-
W
-
24
-
W
Iq
quiescent current
VCC = 17 V; RL = ∞
Istb
standby current
-
Po(SE)
SE output power
VCC = 17 V;
see Figure 7:
VCC = 20 V:
THD = 10 %;
RL = 4 Ω
Po(BTL)
BTL output power
VCC = 17 V;
see Figure 7:
THD = 10 %;
RL = 8 Ω
THD = 0.5 %;
RL = 8 Ω
VCC = 20 V:
THD = 10 %;
RL = 8 Ω
THD
Gv
SVRR
total harmonic
distortion
SE; Po = 1 W
-
0.1
0.5
%
BTL; Po = 1 W
-
0.05
0.5
%
voltage gain
SE
25
26
27
dB
BTL
31
32
33
dB
[4]
-
60
-
dB
[4]
-
60
-
dB
fripple = 1 kHz
[4]
-
65
-
dB
fripple =
100 Hz to 20 kHz
[4]
-
65
-
dB
supply voltage ripple SE:
rejection
fripple = 1 kHz
fripple =
100 Hz to 20 kHz
BTL:
[1]
A minimum load is required at supply voltages of VCC > 22 V; RL = 3 Ω for SE and RL = 6 Ω for BTL.
[2]
The amplifier can deliver output power with non-clipping output signals into nominal loads as long as the
ratings of the IC are not exceeded.
[3]
With a load connected at the outputs the quiescent current will increase.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
2 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
[4]
Supply voltage ripple rejection is measured at the output with a source impedance RSOURCE = 0 Ω at the
input and with a frequency range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with
a frequency fripple and an amplitude of 300 mV (RMS), which is applied to the positive supply rail.
5. Ordering information
Table 2.
Ordering information
Type number
TDA8948J
Package
Name
Description
Version
DBS17P
DBS17P: plastic DIL-bent-SIL power package; 17 leads
(lead length 12 mm)
SOT243-1
6. Block diagram
VCC1
3
IN1+
8
VCC2
16
1
+
+
+
−
4
+
−
14
+
+
OUT1+
60 kΩ
IN2+
6
OUT2−
60 kΩ
IN3+
9
OUT3−
60 kΩ
IN4+
12
17
OUT4+
60 kΩ
CIV
SVR
13
VCC
11
SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
0.5VCC
VREF
7
SGND
MODE1
MODE2
10
5
STANDBY ALL
MUTE ALL
ON 1 + 2
TDA8948J
MUTE 3 + 4
ON 3 + 4
2
GND1
15
GND2
010aaa049
Fig 1.
Block diagram
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
3 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
7. Pinning information
7.1 Pinning
OUT1+
1
GND1
2
VCC1
3
OUT2−
4
MODE2
5
IN2+
6
SGND
7
IN1+
8
IN3+
9
TDA8948J
MODE1 10
SVR 11
IN4+ 12
CIV 13
OUT3− 14
GND2 15
VCC2 16
OUT4+ 17
010aaa046
Fig 2.
Pin configuration diagram
7.2 Pin description
Table 3.
Pin description
Symbol
Pin
Description
OUT1+
1
non inverted loudspeaker output of channel 1
GND1
2
ground of channels 1 and 2
VCC1
3
supply voltage channels 1 and 2
OUT2−
4
inverted loudspeaker output of channel 2
MODE2
5
mode selection 2 input: Mute and On mode for channels 3 and 4
IN2+
6
input channel 2
SGND
7
signal ground
IN1+
8
input channel 1
IN3+
9
input channel 3
MODE1
10
mode selection 1 input: Standby, Mute and On mode for all
channels
SVR
11
half supply voltage decoupling (ripple rejection)
IN4+
12
input channel 4
CIV
13
common input voltage decoupling
OUT3−
14
inverted loudspeaker output of channel 3
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
4 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
Table 3.
Pin description …continued
Symbol
Pin
Description
GND2
15
ground of channels 3 and 4
VCC2
16
supply voltage channels 3 and 4
OUT4+
17
non inverted loudspeaker output of channel 4
8. Functional description
8.1 Input configuration
The input cut-off frequency is:
1
f i ( cut – off ) = ----------------------------2π ( R i × C i )
(1)
For SE application Ri = 60 kΩ and Ci = 220 nF:
1
f i ( cut – off ) = ---------------------------------------------------------------- = 12 Hz
3
–9
2π ( 60 × 10 × 220 × 10 )
(2)
For BTL application Ri = 30 kΩ and Ci = 470 nF:
1
f i ( cut – off ) = ---------------------------------------------------------------- = 11 Hz
3
–9
2π ( 30 × 10 × 470 × 10 )
(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
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
5 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
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 7.
The maximum output power is limited by the supply voltage (VCC = 26 V) and the
maximum output current (IO = 4 A repetitive peak current).
For supply voltages VCC > 22 V, a minimum load is required; see Figure 5:
• SE: RL = 3 Ω
• BTL: RL = 6 Ω
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.
The Average Listening Level (ALL) music power, without any distortion, yields:
• SE at Po(SE) = 5 W, VCC = 17 V, RL = 4 Ω and THD = 0.2 %:
3
5 ⋅ 10
P o ( ALL )SE = --------------- = 315 mW
15.85
(4)
• BTL at Po(BTL) = 10 W, VCC = 17 V, RL = 8 Ω and THD = 0.1 %:
3
10 ⋅ 10
P o ( ALL )BTL = ------------------ = 630 mW
15.85
(5)
The power dissipation can be derived from Figure 8 (SE and BTL) for a headroom of 0 dB
and 12 dB, respectively.
Table 4.
Power rating as function of headroom
Headroom
Power output
SE
BTL
Power dissipation
(all channels driven)
0 dB
Po = 5 W
Po = 10 W
P = 17 W
12 dB
Po(ALL) = 315 mW
Po(ALL) = 630 mW
P=9W
For heat sink calculation at the average listening level, a power dissipation of 9 W can be
used.
8.3 Mode selection
The TDA8948J has three functional modes which can be selected by applying the proper
DC voltage to pin MODE1.
Standby - The current consumption is very low and the outputs are floating. The device is
in standby mode when VMODE1 < 0.8 V, or when the MODE1 pin is grounded. In standby
mode, the function of pin MODE2 has been disabled.
Mute - The amplifier is DC-biased, but not operational (no audio output). This allows the
input coupling capacitors to be charged to avoid pop-noise. The device is in mute mode
when 4.5 V < VMODE1 < (VCC - 3.5 V).
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
6 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
On - The amplifier is operating normally. The on mode is activated at
VMODE1 > (VCC − 2.0 V). The output of channels 3 and 4 can be set to mute or on mode.
The output channels 3 and 4 can be switched on/off by applying a proper DC voltage to
pin MODE2, under the condition that the output channels 1 and 2 are in the on mode (see
Figure 3).
Table 5.
Mode selection
Voltage on pin
Channel 1 and 2
Channel 3 and 4
(sub woofer)
MODE1
MODE2
0 V to 0.8 V
0 V to VCC
Standby mode
Standby mode
4.5 V to (VCC − 3.5 V)
0 V to VCC
Mute mode
Mute mode
(VCC − 2.0 V) to VCC
0 V to (VCC − 3.5 V)
On mode
Mute mode
(VCC − 2 V) to VCC
On mode
On mode
all standby
channels 1 + 2: on
channels 3 + 4: on or mute
all mute
0.8
4.5
VCC −3.5
VCC −2.0 VCC
VMODE1
channels 3 + 4: mute
channels 3 + 4: on
VCC −3.5
mdb016
Fig 3.
VCC −2.0
VCC
VMODE2
Mode selection
8.4 Supply voltage ripple rejection
The Supply Voltage Ripple Rejection (SVRR) is measured with an electrolytic capacitor of
150 µF on pin SVR using a bandwidth of 20 Hz to 22 kHz. Figure 10 illustrates the SVRR
as function of the frequency. A larger capacitor value on pin SVR improves the ripple
rejection behavior at the lower frequencies.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
7 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
8.5 Built-in protection circuits
The TDA8948J contains two types of detection sensors: one measures local temperatures
of the power stages and one measures the global chip temperature. At a local
temperature of approximately 185 °C or a global temperature of approximately 150 °C,
this detection circuit switches off the power stages for 2 ms. High-impedance of the
outputs is the result. After this time period the power stages switch on automatically and
the detection will take place again; still a too high temperature switches off the power
stages immediately. This protects the TDA8948J against shorts to ground, to the supply
voltage and across the load, and against too high chip temperatures.
The protection will only be activated when necessary, so even during a short-circuit
condition, a certain amount of (pulsed) current will still be flowing through the short, just as
much as the power stage can handle without exceeding the critical temperature level.
9. Limiting values
Table 6.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
VCC
supply voltage
operating
no (clipping) signal
[1]
Min
Max
Unit
−0.3
+26
V
−0.3
+28
V
VI
input voltage
-
−0.3
VCC + 0.3
V
IORM
repetitive peak output
current
-
-
4
A
Tstg
storage temperature
non-operating
−55
+150
°C
Tamb
ambient temperature
-
−40
+85
°C
Ptot
total power dissipation
-
-
69
W
VCC(sc)
supply voltage (short circuit) -
-
24
V
[1]
The amplifier can deliver output power with non-clipping output signals into nominal loads as long as the
ratings of the IC are not exceeded.
10. Thermal characteristics
Table 7.
Thermal characteristics
Symbol
Parameter
Conditions
Typ
Unit
Rth(j-a)
thermal resistance from junction
to ambient
in free air
40
K/W
Rth(j-c)
thermal resistance from junction
to case
all channels driven
2
K/W
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
8 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
11. Static characteristics
Table 8.
Static characteristics
VCC = 17 V; Tamb = 25 °C; RL = 8 Ω; VMODE1 = VCC; VMODE2 = VCC; VI = 0 V; measured in test circuit Figure 11; unless
otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
supply voltage
operating
[1]
9
17
26
V
no (clipping) signal
[2]
-
-
28
V
[3]
-
100
145
mA
-
-
10
µA
[4]
-
9
-
V
[5]
-
-
170
mV
on mode
VCC − 2.0 -
VCC
V
mute mode
4.5
-
VCC − 3.5 V
0
-
0.8
V
V
Supply
VCC
Iq
quiescent current
VCC = 17 V; RL = ∞
Istb
standby current
-
output voltage
-
Output pins
VO
∆VO(offset)
differential output voltage offset BTL mode
Mode selection pins
VMODE1
voltage on pin MODE1
standby mode
VMODE2
voltage on pin MODE2
VCC − 2.0 -
VCC
mute mode: channels 3 and 4
0
-
VCC − 3.5 V
on mode: channels 3 and 4
[6]
IMODE1
current on pin MODE1
0 V < VMODE1 < (VCC − 3.5 V)
-
-
20
µA
IMODE2
current on pin MODE2
0 V < VMODE2 < (VCC − 3.5 V)
-
-
20
µA
[1]
A minimum load is required at supply voltages of VCC > 22 V: RL = 3 Ω for SE and RL = 6 Ω for BTL.
[2]
The amplifier can deliver output power with non-clipping output signals into nominal loads as long as the ratings of the IC are not
exceeded.
[3]
With a load connected at the outputs the quiescent current will increase.
[4]
The DC output voltage, with respect to ground, is approximately 0.5 VCC.
[5]
∆VO(offset) = |VOUT+ − VOUT−|
[6]
Channels 3 and 4 can only be set to mute or on mode by MODE2 when VMODE1 > VCC − 2.0 V.
12. Dynamic characteristics
Table 9.
Dynamic characteristics SE
VCC = 17 V; Tamb = 25 °C; RL = 4 Ω; fi = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test circuit Figure 11; unless
otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Po(SE)
SE output power
VCC = 17 V; see Figure 7
THD = 10 %; RL = 4 Ω
6.5
8
-
W
THD = 0.5 %; RL = 4 Ω
-
6
-
W
-
12
-
W
Po = 1 W
-
0.1
0.5
%
VCC = 20 V
THD = 10 %; RL = 4 Ω
THD
total harmonic distortion
Gv
voltage gain
-
25
26
27
dB
Zi
input impedance
-
40
60
-
kΩ
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
9 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
Table 9.
Dynamic characteristics SE …continued
VCC = 17 V; Tamb = 25 °C; RL = 4 Ω; fi = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test circuit Figure 11; unless
otherwise specified.
Symbol
Vn(o)
SVRR
Parameter
Conditions
output noise voltage
supply voltage ripple rejection
Min
Typ
Max
Unit
-
[1]
-
150
-
µV
fripple = 1 kHz
[2]
-
60
-
dB
fripple = 100 Hz to 20 kHz
[2]
-
60
-
dB
[3]
-
-
150
µV
Vo(mute)
mute output voltage
-
αcs
channel separation
RSOURCE = 0 Ω
50
60
-
dB
|∆Gv|
voltage gain difference
-
-
-
1
dB
[1]
The noise output voltage is measured at the output in a frequency range from 20 Hz to 22 kHz (unweighted), with a source impedance
RSOURCE = 0 Ω at the input.
[2]
Supply voltage ripple rejection is measured at the output, with a source impedance RSOURCE = 0 Ω at the input and with a frequency
range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with a frequency fripple and an amplitude of 300 mV (RMS),
which is applied to the positive supply rail.
[3]
Output voltage in mute mode is measured with VMODE1 = VMODE2 = 7 V, and Vi = 1 V (RMS) in a bandwidth from 20 Hz to 22 kHz,
including noise.
Table 10. Dynamic characteristics BTL
VCC = 17 V; Tamb = 25 °C; RL = 8 Ω; f = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test circuit Figure 11; unless
otherwise specified.
Symbol
Parameter
Conditions
Po(BTL)
BTL output power
VCC = 17 V; see Figure 7
Min
Typ
Max
Unit
THD = 10 %; RL = 8 Ω
14
16
-
W
THD = 0.5 %; RL = 8 Ω
-
12
-
W
-
24
-
W
VCC = 20 V
THD = 10 %; RL = 8 Ω
THD
total harmonic distortion
Po = 1 W
-
0.05
0.5
%
Gv
voltage gain
-
31
32
33
dB
Zi
input impedance
-
Vn(o)
SVRR
noise output voltage
supply voltage ripple rejection
20
30
-
kΩ
-
[1]
-
200
-
µV
fripple = 1 kHz
[2]
-
65
-
dB
fripple = 100 Hz to 20 kHz
[2]
-
65
-
dB
[3]
-
-
250
µV
Vo(mute)
mute output voltage
-
αcs
channel separation
RSOURCE = 0 Ω
50
65
-
dB
|∆Gv|
voltage gain difference
-
-
-
1
dB
[1]
The noise output voltage is measured at the output in a frequency range from 20 Hz to 22 kHz (unweighted), with a source impedance
RSOURCE = 0 Ω at the input.
[2]
Supply voltage ripple rejection is measured at the output, with a source impedance RSOURCE = 0 Ω at the input and with a frequency
range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with a frequency fripple and an amplitude of 300 mV (RMS),
which is applied to the positive supply rail.
[3]
Output voltage in mute mode is measured with VMODE1 = VMODE2 = 7 V, and Vi = 1 V (RMS) in a bandwidth from 20 Hz to 22 kHz,
including noise.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
10 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
coc005
107
Vo
(µV)
106
105
104
103
102
10
1
0
4
8
20
16
VMODE1 (V)
12
a. BTL; VCC = 17 V; Vi = 50 mV.
Fig 4.
AC output voltage as a function of voltage on pin MODE1
010aaa111
30
Po(max)
(W)
010aaa112
60
Po(max)
(W)
(2)
20
(3)
(4)
(1)
40
(4)
(3)
(2)
(1)
(5)
10
(5)
20
0
0
8
12
16
20
24
28
8
12
16
20
24
VP (V)
fi =1 kHz
fi = 1 kHz
(1) 1 Ω SE at THD = 10 %
(1) 16 Ω BTL at THD = 10 %
(2) 2 Ω SE at THD = 10 %
(2) 8 Ω BTL at THD = 10 %
(3) 3 Ω SE at THD = 10 %
(3) 6 Ω BTL at THD = 10 %
(4) 4 Ω SE at THD = 10 %
(4) 4 Ω BTL at THD = 10 %
(5) 8 Ω SE at THD = 10 %
(5) 2 Ω BTL at THD = 10 %
a. SE: THD = 10 %; one channel
Fig 5.
28
VP (V)
b. BTL: THD = 10 %; one channel
Maximum output power as a function of supply voltage at various loads
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
11 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
mce488
102
THD + N
(%)
THD + N
(%)
10
10
1
1
10−1
10−1
10−2
10−1
1
10
Po (W)
102
10−2
10−1
VCC = 17 V; fi = 1 kHz; RL = 4 Ω.
10
Po (W)
102
b. BTL
Total harmonic distortion-plus-noise as a function of output power
mce489
10
THD + N
(%)
mce490
10
THD + N
(%)
1
1
10−1
10−1
10−2
10
102
103
VCC = 17 V; Po = 1 W; RL = 4 Ω.
a. SE
Fig 7.
1
VCC = 17 V; fi = 1 kHz; RL = 8 Ω.
a. SE
Fig 6.
mce487
102
104
f (Hz)
105
10−2
10
102
103
104
f (Hz)
105
VCC = 17 V; Po = 1 W; RL = 8 Ω.
b. BTL
Total harmonic distortion-plus-noise as a function of frequency
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
12 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
010aaa430
20
Ptot
(W)
16
Ptot
(W)
16
12
12
8
8
4
4
0
0
0
8
4
12
16
Po (W)
20
0
4
8
12
VCC = 17 V; RL = 4 Ω.
20
VCC = 17 V; RL = 8 Ω.
b. BTL
Total power dissipation as a function of channel output power per channel
(worst case, all channels driven)
mce495
0
αcs
(dB)
−20
−20
−40
−40
−60
−60
−80
−80
−100
10
102
103
104
105
mce496
0
αcs
(dB)
−100
10
102
103
f (Hz)
VCC = 17 V; RL = 4 Ω.
a. SE
Fig 9.
16
Po (W)
a. SE
Fig 8.
010aaa432
20
104
105
f (Hz)
VCC = 17 V; RL = 8 Ω.
b. BTL
Channel separation as a function of frequency (no band-pass filter applied)
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
13 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
mce497
0
SVRR
(dB)
SVRR
(dB)
−20
−20
−40
−40
−60
−60
−80
10
102
103
104
f (Hz)
105
mce498
0
−80
10
102
103
104
f (Hz)
105
VCC = 17 V; RSOURCE = 0 Ω; Vripple = 300 mV (RMS).
VCC = 17 V; RSOURCE = 0 Ω; Vripple = 300 mV (RMS).
A band-pass filter of 20 Hz to 22 kHz has been applied.
A band-pass filter of 20 Hz to 22 kHz has been applied.
Inputs short-circuited.
Inputs short-circuited.
a. SE
b. BTL
Fig 10. Supply voltage ripple rejection as a function of frequency
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
14 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
13. Application information
13.1 Application diagrams
VCC
VCC1
3
220 nF
IN1+ 8
Vi
VCC2
1000 µF
100 nF
16
+
1 OUT1+
+
+
60 kΩ
220 nF
−
IN2+ 6
Vi
4 OUT2−
−
+
RL4 Ω
−
60 kΩ
RL4 Ω
+
IN3+ 9
14 OUT3−
−
+
−
470 nF
60 kΩ
Vi
IN4+ 12
RL8 Ω
+
17 OUT4+
+
+
470 µF
60 kΩ
CIV 13
VCC
SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
VCC
10 kΩ
50 kΩ
22 µF
100 kΩ
270 Ω
BC547
7.5 V
microcontroller
2.2 µF
SVR 11 0.5V
CC
VREF
47 µF
BC547
SGND 7
1.5 kΩ
MODE1 10
VCC
MODE2 5
STANDBY ALL
MUTE ALL
ON 1 + 2
MUTE 3 + 4
ON 3 + 4
TDA8948J
2
GND1
15
GND2
010aaa050
Fig 11. Typical application diagram without on/off switching plops
Table 11. Amplifier selection by microcontroller
Microcontroller with open-collector output; see Figure 11.
Microcontroller
Channels 1 and 2
Channels 3 and 4
LOW
On mode
On mode
HIGH
Mute mode
Mute mode
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
15 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
VCC
VCC1
3
220 nF
IN1+ 8
Vi
VCC2
1000 µF
100 nF
16
+
1 OUT1+
+
+
60 kΩ
220 nF
RL4 Ω
−
IN2+ 6
Vi
4 OUT2−
−
+
−
60 kΩ
RL4 Ω
+
IN3+ 9
14 OUT3−
−
+
−
470 nF
60 kΩ
Vi
IN4+ 12
RL8 Ω
+
17 OUT4+
+
+
470 µF
60 kΩ
CIV 13
VCC
SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
22 µF
SVR 11 0.5V
CC
150 µF
VREF
SGND 7
MODE1 10
MICROCONTROLLER
VCC
MODE2 5
STANDBY ALL
MUTE ALL
ON 1 + 2
MUTE 3 + 4
ON 3 + 4
TDA8948J
2
GND1
15
GND2
010aaa051
Fig 12. Application diagram with one pin control and reduction of capacitor
Remark: Because of switching inductive loads, the output voltage can rise beyond the
maximum supply voltage of 28 V. At high supply voltages, it is recommended to use
(Schottky) diodes to the supply voltage and ground.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
16 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
13.2 Printed-circuit board
13.2.1 Layout and grounding
To obtain a high-level system performance, certain grounding techniques are essential.
The input reference grounds have to be tied with their respective source grounds and
must have separate tracks from the power ground tracks; this will prevent the large
(output) signal currents from interfering with the small AC input signals. The small signal
ground tracks should be physically located as far as possible from the power ground
tracks. Supply and output tracks should be as wide as possible for delivering maximum
output power.
AUDIO POWER CS NIJMEGEN
PF / 3002 .naJ 72
TVA
220 nF
220 nF
100 nF
4Ω
1
4Ω
1
BTL4/3
4Ω
220 nF
BTL1/2
4Ω
220 nF
4Ω
220 nF
CIV
4.7 nF
220 nF
+SE3−
4Ω
1000 µF
22
220 µF
µF
1000 µF
1000 µF
+SE2−
1000 µF
SVF
−SE4+
MODE1
BTL3/4
MODE2
+SE1−
150
µF
OFF
10 kΩ
+Vp
IN2+
IN1+
IN3+
IN4+
VOL.Sgnd
10 kΩ
SB ON
MUTE
ON
mce483
Fig 13. Printed-circuit board layout (single-sided); components view
13.2.2 Power supply decoupling
Proper supply bypassing is critical for low-noise performance and high supply voltage
ripple rejection. The respective capacitor location should be as close as possible to the
device and grounded to the power ground. Proper power supply decoupling also prevents
oscillations.
For suppressing higher frequency transients (spikes) on the supply line a capacitor with
low Equivalent Series Resistance (ESR), typical 100 nF, has to be placed as close as
possible to the device. For suppressing lower frequency noise and ripple signals, a large
electrolytic capacitor, e.g. 1000 µF or greater, must be placed close to the device.
The bypass capacitor on pin SVR reduces the noise and ripple on the mid rail voltage. For
good Total Harmonic Distortion (THD) and noise performance a low ESR capacitor is
recommended.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
17 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
13.3 Thermal behavior and heat sink calculation
The measured maximum thermal resistance of the IC package, Rth(j-mb), is 1.3 K/W.
A calculation for the heat sink can be made, with the following parameters:
Tamb(max) = 60 °C (example)
VCC = 17 V and RL = 4 Ω (SE)
Tj(max) = 150 °C (specification)
Rth(tot) is the total thermal resistance between the junction and the ambient including the
heat sink. This can be calculated using the maximum temperature increase divided by the
power dissipation:
Rth(tot) = (Tj(max) − Tamb(max))/P
At VCC = 17 V and RL = 4 Ω (4 × SE) the measured worst-case sine-wave dissipation is
17 W; see Figure 8. For Tj(max) = 150 °C the temperature raise, caused by the power
dissipation, is: 150 °C − 60 °C = 90 °C:
P × Rth(tot) = 90 °C
Rth(tot) = 90/17 K/W = 5.29 K/W
Rth(h-a) = Rth(tot) − Rth(j-mb) = 5.29 K/W − 2 K/W = 3.29 K/W
This calculation is for an application at worst-case (stereo) sine-wave output signals. In
practice music signals will be applied, which decreases the maximum power dissipation to
approximately half of the sine-wave power dissipation of 9 W (see Section 8.2.2). This
allows for the use of a smaller heat sink:
P × Rth(tot) = 90 °C
Rth(tot) = 90/9 K/W = 10 K/W
Rth(h-a) = Rth(tot) − Rth(j-mb) = 10 K/W - 2 K/W = 8 K/W
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
18 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
mce499
150
Tj
(˚C)
mce500
150
Tj
(˚C)
(1)
(2)
(3)
(4)
(5)
(1)
100
100
50
50
0
(2)
(3)
(4)
(5)
0
8
12
16
20
24
28
VCC (V)
Tamb = 25 °C; external heat sink of 4.3 K/W.
8
12
20
24
28
VCC (V)
Tamb = 25 °C; external heat sink of 4.3 K/W.
(1) RL = 1 Ω.
(1) RL = 2 Ω.
(2) RL = 2 Ω.
(2) RL = 4 Ω.
(3) RL = 3 Ω.
(3) RL = 6 Ω.
(4) RL = 4 Ω.
(4) RL = 8 Ω.
(5) RL = 8 Ω.
(5) RL = 16 Ω.
a. 4 times various SE loads with music signals.
16
b. 2 times various BTL loads with music signals.
Fig 14. Junction temperature as a function of supply voltage for various loads with music signals
14. Test information
14.1 Quality information
The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
19 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
15. Package outline
DBS17P: plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm)
SOT243-1
non-concave
Dh
x
D
Eh
view B: mounting base side
A2
d
B
j
E
A
L3
L
Q
c
1
v M
17
e1
Z
bp
e
e2
m
w M
0
5
10 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
A2
bp
c
D (1)
d
Dh
E (1)
mm
17.0
15.5
4.6
4.4
0.75
0.60
0.48
0.38
24.0
23.6
20.0
19.6
10
12.2
11.8
e
e2
Eh
j
L
L3
m
Q
v
w
x
Z (1)
5.08
6
3.4
3.1
12.4
11.0
2.4
1.6
4.3
2.1
1.8
0.8
0.4
0.03
2.00
1.45
e1
2.54 1.27
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
REFERENCES
IEC
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-17
03-03-12
SOT243-1
Fig 15. Package outline SOT243-1 (DBS17P)
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
20 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
16. Soldering of SMD packages
This text provides a very brief insight into a complex technology. A more in-depth account
of soldering ICs can be found in Application Note AN10365 “Surface mount reflow
soldering description”.
16.1 Introduction to soldering
Soldering is one of the most common methods through which packages are attached to
Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both
the mechanical and the electrical connection. There is no single soldering method that is
ideal for all IC packages. Wave soldering is often preferred when through-hole and
Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not
suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high
densities that come with increased miniaturization.
16.2 Wave and reflow soldering
Wave soldering is a joining technology in which the joints are made by solder coming from
a standing wave of liquid solder. The wave soldering process is suitable for the following:
• Through-hole components
• Leaded or leadless SMDs, which are glued to the surface of the printed circuit board
Not all SMDs can be wave soldered. Packages with solder balls, and some leadless
packages which have solder lands underneath the body, cannot be wave soldered. Also,
leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered,
due to an increased probability of bridging.
The reflow soldering process involves applying solder paste to a board, followed by
component placement and exposure to a temperature profile. Leaded packages,
packages with solder balls, and leadless packages are all reflow solderable.
Key characteristics in both wave and reflow soldering are:
•
•
•
•
•
•
Board specifications, including the board finish, solder masks and vias
Package footprints, including solder thieves and orientation
The moisture sensitivity level of the packages
Package placement
Inspection and repair
Lead-free soldering versus SnPb soldering
16.3 Wave soldering
Key characteristics in wave soldering are:
• Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
• Solder bath specifications, including temperature and impurities
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
21 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
16.4 Reflow soldering
Key characteristics in reflow soldering are:
• Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 16) than a SnPb process, thus
reducing the process window
• Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
• Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 12 and 13
Table 12.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
≥ 350
< 2.5
235
220
≥ 2.5
220
220
Table 13.
Lead-free process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
260
260
1.6 to 2.5
260
250
245
> 2.5
250
245
245
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 16.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
22 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
temperature
maximum peak temperature
= MSL limit, damage level
minimum peak temperature
= minimum soldering temperature
peak
temperature
time
001aac844
MSL: Moisture Sensitivity Level
Fig 16. Temperature profiles for large and small components
For further information on temperature profiles, refer to Application Note AN10365
“Surface mount reflow soldering description”.
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
23 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
17. Revision history
Table 14.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
TDA8948J_1
20080227
Product data sheet
-
-
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
24 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
18. Legal information
18.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
18.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
18.3 Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of this
document, and as such is not complete, exhaustive or legally binding.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
18.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
19. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
TDA8948J_1
Product data sheet
© NXP B.V. 2008. All rights reserved.
Rev. 01 — 27 February 2008
25 of 26
TDA8948J
NXP Semiconductors
4-channel audio amplifier
20. Contents
1
2
2.1
3
4
5
6
7
7.1
7.2
8
8.1
8.2
8.2.1
8.2.2
8.3
8.4
8.5
9
10
11
12
13
13.1
13.2
13.2.1
13.2.2
13.3
14
14.1
15
16
16.1
16.2
16.3
16.4
17
18
18.1
18.2
18.3
18.4
19
20
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Functional features . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Quick reference data . . . . . . . . . . . . . . . . . . . . . 2
Ordering information . . . . . . . . . . . . . . . . . . . . . 3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . 5
Input configuration . . . . . . . . . . . . . . . . . . . . . . 5
Power amplifier . . . . . . . . . . . . . . . . . . . . . . . . . 5
Output power measurement . . . . . . . . . . . . . . . 6
Headroom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . 6
Supply voltage ripple rejection . . . . . . . . . . . . . 7
Built-in protection circuits . . . . . . . . . . . . . . . . . 8
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal characteristics. . . . . . . . . . . . . . . . . . . 8
Static characteristics. . . . . . . . . . . . . . . . . . . . . 9
Dynamic characteristics . . . . . . . . . . . . . . . . . . 9
Application information. . . . . . . . . . . . . . . . . . 15
Application diagrams . . . . . . . . . . . . . . . . . . . 15
Printed-circuit board . . . . . . . . . . . . . . . . . . . . 17
Layout and grounding . . . . . . . . . . . . . . . . . . . 17
Power supply decoupling . . . . . . . . . . . . . . . . 17
Thermal behavior and heat sink calculation . . 18
Test information . . . . . . . . . . . . . . . . . . . . . . . . 19
Quality information . . . . . . . . . . . . . . . . . . . . . 19
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 20
Soldering of SMD packages . . . . . . . . . . . . . . 21
Introduction to soldering . . . . . . . . . . . . . . . . . 21
Wave and reflow soldering . . . . . . . . . . . . . . . 21
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 21
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 24
Legal information. . . . . . . . . . . . . . . . . . . . . . . 25
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 25
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Contact information. . . . . . . . . . . . . . . . . . . . . 25
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2008.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 27 February 2008
Document identifier: TDA8948J_1
Similar pages