TDA8944J 2 x 7 W stereo Bridge Tied Load

TDA8944J
2 x 7 W stereo Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 14 February 2000
Product specification
1. General description
The TDA8944J is a dual-channel audio power amplifier with an output power of
2 × 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J is
printed-circuit board (PCB) compatible with all other types in the TDA894x family.
One PCB footprint accommodates both the mono and the stereo products.
2. Features
„
„
„
„
„
„
„
„
„
Few external components
Fixed gain
Standby and mute mode
No on/off switching plops
Low standby current
High supply voltage ripple rejection
Outputs short-circuit protected to ground, supply and across the load
Thermally protected
Printed-circuit board compatible.
c
c
3. Applications
„ Mains fed applications (e.g. TV sound)
„ PC audio
„ Portable audio.
4. Quick reference data
Table 1:
Quick reference data
Symbol Parameter
VCC
supply voltage
Iq
quiescent supply current
Istb
standby supply current
Conditions
VCC = 12 V; RL = ∞
Min
Typ
Max
Unit
6
12
18
V
-
24
36
mA
-
-
10
μA
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
Table 1:
Quick reference data…continued
Symbol Parameter
Conditions
Min
Typ
Max
Unit
Po
output power
THD = 10%; RL = 8 Ω;
VCC = 12 V
6
7
-
W
THD
total harmonic distortion
Po = 1 W
-
0.03
0.1
%
Gv
voltage gain
31
32
33
dB
SVRR
supply voltage ripple
rejection
50
65
-
dB
5. Ordering information
Table 2:
Ordering information
Type number
TDA8944J
Package
Name
Description
Version
DBS17P
plastic DIL-bent-SIL power package;
17 leads (lead length 12 mm)
SOT243-1
6. Block diagram
width
VCC1
VCC2
3
16
1
IN1−
IN1+
8
OUT1−
6
4
OUT1+
TDA8944J
14
IN2−
IN2+
9
OUT2−
12
17
OUT2+
VCC
MODE
SVR
10
STANDBY/
MUTE LOGIC
20
kΩ
SHORT CIRCUIT
AND
TEMPERATURE
PROTECTION
11
20
kΩ
2
15
MBK933
GND1
GND2
Fig 1. Block diagram.
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Rev. 02 — 14 February 2000
2 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
7. Pinning information
7.1 Pinning
handbook, halfpage
OUT1− 1
GND1 2
VCC1 3
OUT1+ 4
n.c. 5
IN1+ 6
n.c. 7
IN1− 8
IN2− 9
TDA8944J
MODE 10
SVR 11
IN2+ 12
n.c. 13
OUT2− 14
GND2 15
VCC2 16
OUT2+ 17
MBK936
Fig 2. Pin configuration.
7.2 Pin description
Table 3:
Pin description
Symbol
Pin
Description
OUT1−
1
negative loudspeaker terminal 1
GND1
2
ground channel 1
VCC1
3
supply voltage channel 1
OUT1+
4
positive loudspeaker terminal 1
n.c.
5
not connected
IN1+
6
positive input 1
n.c.
7
not connected
IN1−
8
negative input 1
IN2−
9
negative input 2
MODE
10
mode selection input (standby, mute, operating)
SVR
11
half supply voltage decoupling (ripple rejection)
IN2+
12
positive input 2
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Product specification
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Rev. 02 — 14 February 2000
3 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
Table 3:
Pin description…continued
Symbol
Pin
Description
n.c.
13
not connected
OUT2−
14
negative loudspeaker terminal 2
GND2
15
ground channel 2
VCC2
16
supply voltage channel 2
OUT2+
17
positive loudspeaker terminal 2
8. Functional description
The TDA8944J is a stereo BTL audio power amplifier capable of delivering 2 × 7 W
output power to an 8 Ω load at THD = 10%, using a 12 V power supply and an
external heatsink. The voltage gain is fixed at 32 dB.
With the three-level MODE input the device can be switched from ‘standby’ to ‘mute’
and to ‘operating’ mode.
The TDA8944J outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
8.1 Input configuration
The TDA8944J inputs can be driven symmetrical (floating) as well as asymmetrical.
In the asymmetrical mode one input pin is connected via a capacitor to the signal
ground which should be as close as possible to the SVR (electrolytic) capacitor
ground. Note that the DC level of the input pins is half of the supply voltage VCC, so
coupling capacitors for both pins are necessary.
The input cut-off frequency is:
1
f i ( cut – off ) = -----------------------------2 – ( Ri × Ci )
(1)
For Ri = 45 kΩ and Ci = 220 nF:
1
f i ( cut – off ) = ------------------------------------------------------------------ = 16 Hz
3
–9
2 – ( 45 × 10 × 220 × 10 )
(2)
As shown in Equation 1 and 2, 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
behaviour.
Remark: To prevent HF oscillations do not leave the inputs open, connect a capacitor
of at least 1.5 nF across the input pins close to the device.
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Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
4 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
8.2 Power amplifier
The power amplifier is a Bridge Tied Load (BTL) amplifier with an all-NPN output
stage, capable of delivering a peak output current of 2 A.
The BTL principle offers the following advantages:
•
•
•
•
8.2.1
Lower peak value of the supply current
The ripple frequency on the supply voltage is twice the signal frequency
No expensive DC-blocking capacitor
Good low frequency performance.
Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10%; see Figure 8. The maximum output power is limited by the maximum
supply voltage of 12 V and the maximum available output current: 2 A repetitive peak
current.
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 = 12 V, RL = 8 Ω and Po = 4 W at THD = 0.1% (see Figure 6), the
Average Listening Level (ALL) – music power – without any distortion yields:
Po(ALL) = 4 W/15.85 = 252 mW.
The power dissipation can be derived from Figure 11 on page 10 for 0 dB
respectively 12 dB headroom.
Table 4:
Power rating as function of headroom
Headroom
Power output (THD = 0.1%)
Power dissipation (P)
0 dB
Po = 4 W
8W
12 dB
Po(ALL) = 252 mW
4W
For the average listening level a power dissipation of 4 W can be used for a heatsink
calculation.
8.3 Mode selection
The TDA8944J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE. See Figure 4 and 5 for the respective DC levels,
which depend on the supply voltage level. The MODE pin can be driven by a 3-state
logic output stage: e.g. a microcontroller with additional components for DC-level
shifting.
Standby — In this mode the current consumption is very low and the outputs are
floating. The device is in standby mode when (VCC − 0.5 V) < VMODE < VCC, or when
the MODE pin is left floating (high impedance). The power consumption of the
TDA8944J will be reduced to <0.18 mW.
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Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
5 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
Mute — In this mode the amplifier is DC-biased but not operational (no audio output);
the DC level of the input and output pins remain on half the supply voltage. This
allows the input coupling and Supply Voltage Ripple Rejection (SVRR) capacitors to
be charged to avoid pop-noise. The device is in mute mode when
3 V < VMODE < (VCC − 1.5 V).
Operating — In this mode the amplifier is operating normally. The operating mode is
activated at VMODE < 0.5 V.
8.3.1
Switch-on and switch-off
To avoid audible plops during supply voltage switch-on or switch-off, the device is set
to standby mode before the supply voltage is applied (switch-on) or removed
(switch-off).
The switch-on and switch-off time can be influenced by an RC-circuit on the MODE
pin. Rapid on/off switching of the device or the MODE pin may cause ‘click- and
pop-noise’. This can be prevented by proper timing of the RC-circuit on the MODE
pin.
8.4 Supply Voltage Ripple Rejection (SVRR)
The SVRR is measured with an electrolytic capacitor of 10 μF on pin SVR at a
bandwidth of 10 Hz to 80 kHz. Figure 13 on page 11 illustrates the SVRR as function
of the frequency. A larger capacitor value on the SVR pin improves the ripple
rejection behaviour at the lower frequencies.
8.5 Built-in protection circuits
The TDA8944J contains two types of protection circuits, i.e. short-circuit and thermal
shutdown.
8.5.1
Short-circuit protection
Short-circuit to ground or supply line — This is detected by a so-called ‘missing
current’ detection circuit which measures the current in the positive supply line and
the current in the ground line. A difference between both currents larger than 0.4 A,
switches the power stage to standby mode (high impedance).
Short-circuit across the load — This is detected by an absolute-current
measurement. An absolute-current larger than 2 A, switches the power stage to
standby mode (high impedance).
8.5.2
Thermal shutdown protection
The junction temperature is measured by a temperature sensor; at a junction
temperature of approximately 150 °C this detection circuit switches the power stage
to standby mode (high impedance).
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
6 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
9. Limiting values
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
VCC
supply voltage
no signal
−0.3
+25
V
operating
−0.3
+18
V
VI
input voltage
−0.3
VCC + 0.3
V
IORM
repetitive peak output current
-
2
A
Tstg
storage temperature
−55
+150
°C
Tamb
operating ambient temperature
−40
+85
°C
Ptot
total power dissipation
-
18
W
VCC(sc)
supply voltage to guarantee short-circuit
protection
-
15
V
non-operating
10. Thermal characteristics
Table 6:
Thermal characteristics
Symbol
Parameter
Conditions
Rth(j-a)
thermal resistance from junction to ambient
in free air
Rth(j-mb)
thermal resistance from junction to mounting base both channels driven
Value
Unit
40
K/W
6.9
K/W
11. Static characteristics
Table 7: Static characteristics
VCC = 12 V; Tamb = 25 °C; RL = 8 Ω; VMODE = 0 V; Vi = 0 V; measured in test circuit Figure 14; unless otherwise specified.
Symbol
Parameter
Conditions
VCC
supply voltage
operating
Iq
quiescent supply current
RL = ∞
Istb
standby supply current
VMODE = VCC
VO
DC output voltage
ΔVOUT [3]
differential output voltage offset
VMODE
mode selection input voltage
IMODE
[1]
mode selection input current
[1]
[2]
operating mode
Min
Typ
Max
Unit
6
12
18
V
-
24
36
mA
-
-
10
μA
-
6
-
V
-
-
200
mV
0
-
0.5
V
mute mode
3
-
VCC − 1.5
V
standby mode
VCC − 0.5
-
VCC
V
0 < VMODE < VCC
-
-
20
μA
With a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal to the differential
output voltage offset (ΔVOUT) divided by the load resistance (RL).
[2]
The DC output voltage with respect to ground is approximately 0.5VCC.
[3]
ΔVOUT = ⎪VOUT+ − VOUT− ⎪
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Rev. 02 — 14 February 2000
7 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
MGL954
50
Iq
(mA)
(mA)
40
40
30
30
20
20
10
10
0
0
MGL955
50
Iq
handbook, halfpage
handbook, halfpage
VCC = 12 V
4
8
12
0
0
16
20
VCC (V)
Fig 3. Quiescent current as function of supply
voltage.
4
8
12
20
16
VMODE (V)
Fig 4. Quiescent current as function of mode voltage.
12. Dynamic characteristics
Table 8: Dynamic characteristics
VCC = 12 V; Tamb = 25 °C; RL = 8 Ω; f = 1 kHz; VMODE = 0 V; measured in test circuit Figure 14; audio pass band
22 Hz to 22 kHz; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Po
output power
THD = 10%
6
7
-
W
THD = 0.5%
4
5
-
W
Po = 1 W
-
0.03
0.1
%
THD
total harmonic distortion
Gv
voltage gain
31
32
33
dB
Zi(dif)
differential input impedance
70
90
110
kΩ
Vn(o)
noise output voltage
[1]
-
90
120
μV
supply voltage ripple rejection
fripple = 1 kHz
[2]
50
65
-
dB
fripple = 100 Hz
to 20 kHz
[2]
-
60
-
dB
[3]
-
-
50
μV
50
75
-
dB
SVRR
Vo(mute)
output voltage
mute mode
αcs
channel separation
Rs = 0 Ω
[1]
The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz (unweighted), with a source impedance
Rs = 0 Ω at the input.
[2]
Supply voltage ripple rejection is measured at the output, with a source impedance Rs = 0 Ω at the input. The ripple voltage is a sine
wave with a frequency fripple and an amplitude of 707 mV (RMS), which is applied to the positive supply rail.
[3]
Output voltage in mute mode is measured with an input voltage of 1 V (RMS) in a bandwidth of 20 kHz, so including noise.
9397 750 06861
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© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
8 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
MGL957
10
handbook, full pagewidth
Vo
(V)
1
10−1
10−2
10−3
10−4
VCC = 12 V
10−5
0
4
8
12
16
20
VMODE (V)
Fig 5. Output voltage as function of mode voltage.
MGL952
102
handbook, halfpage
MGL953
10
handbook, halfpage
THD
(%)
THD
(%)
10
VCC = 12 V
1
Po = 0.1 W
1
1W
10−1
10−1
10−2
10−2
10−1
1
10
Po (W)
102
10−2
10
102
103
104
f (Hz)
105
No bandpass filter applied.
Fig 6. Total harmonic distortion as function of output
power.
Fig 7. Total harmonic distortion as function of
frequency.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
9 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
MGL959
20
handbook, halfpage
MGL960
20
handbook, halfpage
Po
(W)
16
Ptot
(W)
16
12
12
RL = 8 Ω
RL = 8 Ω
8
8
16 Ω
16 Ω
4
0
0
4
4
8
12
0
16
20
VCC (V)
0
4
8
12
16
20
VCC (V)
THD = 10%.
Fig 8. Output power as function of supply voltage.
MGL962
100
Fig 9. Total power dissipation as function of supply
voltage.
MGL961
10
handbook, halfpage
handbook, halfpage
η
P
(%)
(W)
8
80
RL = 8 Ω
RL = 16 Ω
6
60
8Ω
40
4
20
2
0
0
2
4
6
10
8
0
0
16 Ω
2
4
6
8
10
Po (W)
Po (W)
VCC = 12 V.
Fig 10. Efficiency as function of output power.
Fig 11. Power dissipation as function of output power.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
10 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
MGL958
0
handbook, halfpage
αcs
(dB)
−20
−40
−60
−80
−100
10
102
103
104
f (Hz)
105
No bandpass filter applied.
Fig 12. Channel separation as function of frequency.
MGL956
0
handbook, full pagewidth
SVRR
(dB)
−20
−40
B
CH2
−60
CH1
A
−80
10
102
103
104
f (Hz)
105
VCC = 12 V; Rs = 0 Ω; Vripple = 707 mV (peak-to-peak); no bandpass filter applied.
Curves A: inputs short-circuited
Curves B: inputs short-circuited and connected to ground (asymmetrical application)
Fig 13. Supply voltage ripple rejection as function of frequency.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
11 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
13. Internal circuitry
Table 9:
Internal circuitry
Pin
Symbol
6 and 8
IN1+ and IN1−
12 and 9
IN2+ and IN2−
Equivalent circuit
VCC
VCC
1.5 kΩ
1.5 kΩ
45 kΩ
45 kΩ
VCC
8, 9
6, 12
1/2 VCC
1:1
1 and 4
OUT1− and OUT1+
14 and 17
OUT2− and OUT2+
1:1
(SVR)
MGL946
100 Ω
1, 4, 14, 17
40 Ω
1/2 VCC
MGL947
10
MODE
VCC
VCC
1 kΩ
10 kΩ
VCC
1 kΩ
10 kΩ
10
MUTE
HIGH
OFF
HIGH
MGL949
11
SVR
VCC
Standby
20 kΩ
11
20 kΩ
MGL948
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Rev. 02 — 14 February 2000
12 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
14. Application information
+VCC
100 nF
3
Rs
220 nF
Symmetrical
input
Ci
16
IN1− 8
−
Ri
45 kΩ
1.5
nF
−
1/2 VCC
220 nF
+
Ri
1 OUT1−
+
+
−
RL
1/2 VCC
8Ω
+
45 kΩ
220 nF
Rs
1000 μF
6
4 OUT1+
−
IN1+
Asymmetrical
Ci
input
TDA8944J
IN2− 9
220 nF
−
Ri
signal
GND
45 kΩ
1.5
nF
−
1/2 VCC
+
Ri
VCC
12
signal
GND
C2
MODE
C1
C2
Standby
Mute
On
0
0
1
0
1
0
8Ω
17 OUT2+
−
VCC
STANDBY/
MUTE LOGIC
20 kΩ
R
MICROCONTROLLER
RL
1/2 VCC
45 kΩ
R
C1
+
−
+
IN2+
MODE 10
14 OUT2−
+
SHORT CIRCUIT
AND
TEMPERATURE
PROTECTION
1/2 VCC
SVR 11
10
μF
20 kΩ
2
15
GND
, full pagewidth
MGL950
Fig 14. Application diagram.
14.1 Printed-circuit board (PCB)
14.1.1
Layout and grounding
For a high system performance level 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.
9397 750 06861
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Rev. 02 — 14 February 2000
13 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
54 mm
width
56 mm
OUT2−
ON
MUTE
OUT2+ +
−
10 μF
17
220 nF
IN2−
IN2+
1.5 nF
220 nF
IN1−
IN1+
VCC
1
OUT1−
100 nF
1000 μF
GND
OUT1+
MGL951
Fig 15. Printed-circuit board layout (single-sided); components view.
14.1.2
Power supply decoupling
Proper supply bypassing is critical for low-noise performance and high supply voltage
ripple rejection. The respective capacitor locations 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 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 µμF or greater – must be placed close to the device.
The bypass capacitor on the SVR pin reduces the noise and ripple on the midrail
voltage. For good THD and noise performance a low ESR capacitor is recommended.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
14 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
14.2 Thermal behaviour and heatsink calculation
The measured maximum thermal resistance of the IC package, Rth(j-mb) is 6.9 K/W.
A calculation for the heatsink can be made, with the following parameters:
Tamb(max) = 50 °C
VCC = 12 V and RL = 8 Ω
Tj(max) = 150 °C.
Rth(tot) is the total thermal resistance between the junction and the ambient
including the heatsink. In the heatsink calculations the value of Rth(mb-h) is ignored.
At VCC = 12 V and RL = 8 Ω the measured worstcase sine-wave dissipation is 8 W;
see Figure 11. For Tj(max) = 150 °C the temperature raise - caused by the power
dissipation - is: 150 – 50 = 100 °C.
P × Rth(tot) = 100 °C
Rth(tot) = 100/8 = 12.5 K/W
Rth(h-a) = Rth(tot) – Rth(j-mb) = 12.5 – 6.9 = 5.6 K/W.
The calculation above is for an application at worstcase (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 (see
Section 8.2.2). This allows for the use of a smaller heatsink:
P × Rth(tot) = 100 °C
Rth(tot) = 100/4 = 25 K/W
Rth(h-a) = Rth(tot) – Rth(j-mb) = 25 – 6.9 = 18.1 K/W.
To increase the lifetime of the IC, Tj(max) should be reduced to 125 °C. This requires a
heatsink of approximately 12 K/W for music signals.
15. Test information
15.1 Quality information
The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
15.2 Test conditions
Tamb = 25 °C; VCC = 12 V; f = 1 kHz; RL = 8 Ω; audio pass band 22 Hz to 22 kHz;
unless otherwise specified.
Remark: In the graphs as function of frequency no bandpass filter was applied; see
Figure 7, 12 and 13.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
15 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
16. 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 16. DBS17P package outline.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
16 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
17. Soldering
17.1 Introduction to soldering through-hole mount packages
This text gives a brief insight to wave, dip and manual soldering. A more in-depth
account of soldering ICs can be found in our Data Handbook IC26; Integrated Circuit
Packages (document order number 9398 652 90011).
Wave soldering is the preferred method for mounting of through-hole mount IC
packages on a printed-circuit board.
17.2 Soldering by dipping or by solder wave
Driven by legislation and environmental forces the worldwide use of lead-free solder
pastes is increasing. Typical dwell time of the leads in the wave ranges from
3 to 4 seconds at 250 °C or 265 °C, depending on solder material applied, SnPb or
Pb-free respectively.
The total contact time of successive solder waves must not exceed 5 seconds.
The device may be mounted up to the seating plane, but the temperature of the
plastic body must not exceed the specified maximum storage temperature (Tstg(max)).
If the printed-circuit board has been pre-heated, forced cooling may be necessary
immediately after soldering to keep the temperature within the permissible limit.
17.3 Manual soldering
Apply the soldering iron (24 V or less) to the lead(s) of the package, either below the
seating plane or not more than 2 mm above it. If the temperature of the soldering iron
bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit
temperature is between 300 and 400 °C, contact may be up to 5 seconds.
17.4 Package related soldering information
Table 10: Suitability of through-hole mount IC packages for dipping and wave soldering
methods
Package
Soldering method
Dipping
Wave
DBS, DIP, HDIP, RDBS, SDIP, SIL
suitable
suitable [1]
PMFP [2]
−
not suitable
[1]
For SDIP packages, the longitudinal axis must be parallel to the transport direction of the
printed-circuit board.
[2]
For PMFP packages hot bar soldering or manual soldering is suitable.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
17 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
18. Revision history
Table 11: Revision history
Rev Date
CPCN
Description
02
000214
-
Product specification; second version; supersedes initial version TDA8944J-01 of
14 April 1999 (9397 750 04881). Modifications:
•
•
•
•
Table 1 on page 1: SVRR; Typ value 65 dB → added
Figure 1 on page 2: Block diagram; pin numbers changed OUT2− → 14 and OUT2+ → 17
Figure 2 on page 3: Pin configuration; pin numbers changed OUT2− → 14 and OUT2+ → 17
Section 8 “Functional description”:
– Section 8.1 “Input configuration” on page 4 → added.
– Section 8.2 “Power amplifier” on page 5: ........, capable of delivering a peak output
current of 1.5 A → changed to 2 A.
– Section 8.2.1 “Output power measurement” on page 5 → added
– Section 8.2.2 “Headroom” on page 5 → added
•
Section 8.3 “Mode selection”:
– Standby mode: VMODE > (VCC − 0.5 V) → changed to (VCC − 0.5 V) < VMODE < VCC; The
power consumption of the TDA8944J will be reduced to <0.18 mW → added.
– Mute mode: the DC level of the input and output pins remain on half the supply
voltage → added;
– 2.5 V < VMODE < (VCC − 1.5 V) → changed to 3 V < VMODE < (VCC − 1.5 V)
– Section 8.3.1 “Switch-on and switch-off” on page 6
•
•
•
Section 8.4 “Supply Voltage Ripple Rejection (SVRR)” on page 6 → added
Section 8.5 “Built-in protection circuits” on page 6 → added
Table 5 on page 7:
– Ptot value added 18 V
– VCC(sc) value added 15 V
•
Table 6 on page 7:
– Rth(j-a) value added 40 K/W
– Rth(j-c) value 10 → changed to 6.9 K/W; condition ‘in free air’ → changed to ‘both channels
driven’
•
•
Table 7 on page 7: VMODE - mute mode - value Min 2.5 → changed to 3 V
Table 8 on page 8:
– SVRR; Typ values 65 and 60 dB → added
– αcs; Typ value 75 dB → added
•
•
•
•
•
•
•
01
990414
-
Figure 3 to 13: figures added
Section 13 “Internal circuitry” on page 12: → added
Figure 14: figure adjusted
Section 14.1 “Printed-circuit board (PCB)” on page 13: → added
Figure 15: figure added
Section 14.2 “Thermal behaviour and heatsink calculation” on page 15: → added
Section 15.2 “Test conditions” on page 15: → added
Preliminary specification; initial version.
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
18 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
19. 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]
[2]
[3]
Please consult the most recently issued document before initiating or completing a design.
The term ‘short data sheet’ is explained in section “Definitions”.
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.
20. 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.
Product specification — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to offer functions and qualities beyond those described in the
Product data sheet.
21. Disclaimers
Limited warranty and liability — 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.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation lost profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
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 life support, life-critical or
safety-critical systems or 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.
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP
Semiconductors accepts no liability for any assistance with applications or
customer product design. It is customer’s sole responsibility to determine
whether the NXP Semiconductors product is suitable and fit for the
customer’s applications and products planned, as well as for the planned
application and use of customer’s third party customer(s). Customers should
provide appropriate design and operating safeguards to minimize the risks
associated with their applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial 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, unless otherwise
agreed in a valid written individual agreement. In case an individual
agreement is concluded only the terms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
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.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from national authorities.
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.
9397 750 06861
Product specification
© NXP B.V. 2010 All rights reserved.
Rev. 02 — 14 February 2000
19 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors product is automotive qualified,
the product is not suitable for automotive use. It is neither qualified nor tested
in accordance with automotive testing or application requirements. NXP
Semiconductors accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards,
customer (a) shall use the product without NXP Semiconductors’ warranty of
the product for such automotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, damages or failed product claims resulting from customer design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
9397 750 06861
Product specification
© NXP B.V. 2010 All rights reserved.
Rev. 02 — 14 February 2000
20 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
NXP Semiconductors
provides High Performance Mixed Signal and Standard Product solutions
that leverage its leading RF, Analog, Power Management, Interface, Security
and Digital Processing expertise
Customer notification
This data sheet was changed to reflect the new company name NXP Semiconductors, including new
legal definitions and disclaimers. No changes were made to the technical content, except for package
outline drawings which were updated to the latest version.
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
9397 750 06861
Product specification
© NXP B.V. 2010. All rights reserved.
Rev. 02 — 14 February 2000
21 of 22
TDA8944J
NXP Semiconductors
2 x 7 W stereo BTL audio amplifier
Contents
1
2
3
4
5
6
7
7.1
7.2
8
8.1
8.2
8.2.1
8.2.2
8.3
8.3.1
8.4
8.5
8.5.1
8.5.2
9
10
11
12
13
14
14.1
14.1.1
14.1.2
14.2
15
15.1
15.2
16
17
17.1
17.2
17.3
17.4
18
19
20
21
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Quick reference data . . . . . . . . . . . . . . . . . . . . . 1
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pinning information . . . . . . . . . . . . . . . . . . . . . . 3
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional description . . . . . . . . . . . . . . . . . . . 4
Input configuration . . . . . . . . . . . . . . . . . . . . . . 4
Power amplifier . . . . . . . . . . . . . . . . . . . . . . . . . 5
Output power measurement . . . . . . . . . . . . . . . 5
Headroom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . 5
Switch-on and switch-off. . . . . . . . . . . . . . . . . . 6
Supply Voltage Ripple Rejection (SVRR) . . . . . 6
Built-in protection circuits . . . . . . . . . . . . . . . . . 6
Short-circuit protection . . . . . . . . . . . . . . . . . . . 6
Thermal shutdown protection . . . . . . . . . . . . . . 6
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal characteristics . . . . . . . . . . . . . . . . . . 7
Static characteristics. . . . . . . . . . . . . . . . . . . . . 7
Dynamic characteristics . . . . . . . . . . . . . . . . . . 8
Internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 12
Application information. . . . . . . . . . . . . . . . . . 13
Printed-circuit board (PCB). . . . . . . . . . . . . . . 13
Layout and grounding . . . . . . . . . . . . . . . . . . . 13
Power supply decoupling . . . . . . . . . . . . . . . . 14
Thermal behaviour and heatsink calculation . 15
Test information. . . . . . . . . . . . . . . . . . . . . . . . 15
Quality information . . . . . . . . . . . . . . . . . . . . . 15
Test conditions . . . . . . . . . . . . . . . . . . . . . . . . 15
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 16
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Introduction to soldering through-hole mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Soldering by dipping or by solder wave . . . . . 17
Manual soldering . . . . . . . . . . . . . . . . . . . . . . 17
Package related soldering information . . . . . . 17
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 18
Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 19
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
© NXP B.V. 2010.
Printed in The Netherlands
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner.
The information presented in this document does not form part of any quotation or
contract, is believed to be accurate and reliable and may be changed without notice. No
liability will be accepted by the publisher for any consequence of its use. Publication
thereof does not convey nor imply any license under patent- or other industrial or
intellectual property rights.
Date of release: 14 February 2000
Document order number: 9397 750 06861
Mouser Electronics
Authorized Distributor
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