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
c
c
■ Printed-circuit board compatible.
3. Applications
■ Mains fed applications (e.g. TV sound)
■ PC audio
■ Portable audio.
4. Quick reference data
Table 1: Quick reference data
Symbol Parameter
Conditions
Min
Typ
12
24
-
Max Unit
VCC
Iq
supply voltage
6
-
18
36
10
V
quiescent supply current VCC = 12 V; RL = ∞
mA
µA
Istb
standby supply current
-
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
7. Pinning information
7.1 Pinning
handbook, halfpage
OUT1−
1
2
3
4
5
6
7
8
9
GND1
V
CC1
OUT1+
n.c.
IN1+
n.c.
IN1−
IN2−
TDA8944J
MODE 10
SVR 11
IN2+ 12
n.c. 13
OUT2− 14
GND2 15
V
16
CC2
OUT2+ 17
MBK936
Fig 2. Pin configuration.
7.2 Pin description
Table 3: Pin description
Symbol
OUT1−
GND1
VCC1
Pin
1
Description
negative loudspeaker terminal 1
ground channel 1
2
3
supply voltage channel 1
positive loudspeaker terminal 1
not connected
OUT1+
n.c.
4
5
IN1+
6
positive input 1
n.c.
7
not connected
IN1−
8
negative input 1
IN2−
9
negative input 2
MODE
SVR
10
11
12
mode selection input (standby, mute, operating)
half supply voltage decoupling (ripple rejection)
positive input 2
IN2+
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Product specification
Rev. 02 — 14 February 2000
3 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
Table 3: Pin description…continued
Symbol
Pin
13
14
15
16
17
Description
n.c.
not connected
OUT2−
GND2
VCC2
negative loudspeaker terminal 2
ground channel 2
supply voltage channel 2
positive loudspeaker terminal 2
OUT2+
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 )
=
(1)
(2)
------------------------------
2 – (Ri × Ci)
For Ri = 45 kΩ and Ci = 220 nF:
1
f i(cut – off )
=
= 16 Hz
------------------------------------------------------------------
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
Rev. 02 — 14 February 2000
4 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
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:
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.
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
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
0 dB
Power output (THD = 0.1%)
Po = 4 W
Power dissipation (P)
8 W
4 W
12 dB
Po(ALL) = 252 mW
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
Rev. 02 — 14 February 2000
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TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
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.
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).
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Product specification
Rev. 02 — 14 February 2000
6 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
9. Limiting values
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
no signal
Min
−0.3
−0.3
−0.3
-
Max
+25
+18
VCC + 0.3
2
Unit
V
VCC
supply voltage
operating
V
VI
input voltage
V
IORM
Tstg
repetitive peak output current
storage temperature
A
non-operating
−55
−40
-
+150
+85
18
°C
°C
W
V
Tamb
Ptot
operating ambient temperature
total power dissipation
VCC(sc)
supply voltage to guarantee short-circuit
protection
-
15
10. Thermal characteristics
Table 6: Thermal characteristics
Symbol
Rth(j-a)
Parameter
thermal resistance from junction to ambient
Conditions
Value
Unit
K/W
K/W
in free air
40
Rth(j-mb)
thermal resistance from junction to mounting base both channels driven
6.9
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
VCC
Iq
Parameter
Conditions
operating
Min
Typ
Max
18
Unit
V
supply voltage
6
12
24
-
[1]
[2]
quiescent supply current
standby supply current
DC output voltage
RL = ∞
-
36
mA
µA
V
Istb
VMODE = VCC
-
10
VO
-
6
-
-
[3]
∆VOUT
differential output voltage offset
mode selection input voltage
-
200
0.5
mV
V
VMODE
operating mode
mute mode
0
-
3
-
VCC − 1.5
VCC
20
V
standby mode
0 < VMODE < VCC
VCC − 0.5
-
V
IMODE
mode selection input current
-
-
µA
[1] 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 (∆VOUT) divided by the load resistance (RL).
[2] The DC output voltage with respect to ground is approximately 0.5VCC
.
[3] ∆VOUT = VOUT+ − VOUT−
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Product specification
Rev. 02 — 14 February 2000
7 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
MGL955
MGL954
50
50
handbook, halfpage
handbook, halfpage
I
I
q
q
(mA)
(mA)
40
40
30
20
10
30
20
V
= 12 V
CC
10
0
0
0
4
8
12
16
V
20
(V)
0
4
8
12
16
V
20
(V)
MODE
CC
Fig 3. Quiescent current as function of supply
voltage.
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
THD = 10%
THD = 0.5%
Po = 1 W
Min
6
Typ
7
Max
-
Unit
W
Po
output power
4
5
-
W
THD
Gv
total harmonic distortion
voltage gain
-
0.03
32
90
90
65
60
0.1
33
110
120
-
%
31
70
-
dB
kΩ
µV
dB
dB
Zi(dif)
Vn(o)
SVRR
differential input impedance
noise output voltage
[1]
[2]
supply voltage ripple rejection
fripple = 1 kHz
50
-
fripple = 100 Hz
to 20 kHz
-
[3]
Vo(mute)
output voltage
mute mode
-
-
50
-
µV
αcs
channel separation
Rs = 0 Ω
50
75
dB
[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.
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Product specification
Rev. 02 — 14 February 2000
8 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
MGL957
10
V
o
(V)
1
−1
10
−2
10
−3
10
−4
10
V
= 12 V
CC
−5
10
0
4
8
12
16
20
V
(V)
MODE
Fig 5. Output voltage as function of mode voltage.
MGL952
2
MGL953
10
10
handbook, halfpage
handbook, halfpage
THD
(%)
THD
(%)
10
V
= 12 V
CC
1
P
= 0.1 W
1 W
o
1
−1
10
−1
10
−2
10
−2
10
10
−2
−1
2
10
10
1
10
10
2
3
4
5
10
10
10
10
P
(W)
o
f (Hz)
No bandpass filter applied.
Fig 6. Total harmonic distortion as function of output
power.
Fig 7. Total harmonic distortion as function of
frequency.
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Product specification
Rev. 02 — 14 February 2000
9 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
MGL959
MGL960
20
20
handbook, halfpage
handbook, halfpage
P
P
o
tot
(W)
16
(W)
16
12
12
8
R
= 8 Ω
R
= 8 Ω
L
L
8
16 Ω
16 Ω
4
0
4
0
0
0
4
8
12
16
V
20
(V)
4
8
12
16
V
20
(V)
CC
CC
THD = 10%.
Fig 8. Output power as function of supply voltage.
Fig 9. Total power dissipation as function of supply
voltage.
MGL962
MGL961
100
10
handbook, halfpage
handbookη, halfpage
P
(%)
(W)
R
L
= 8 Ω
80
8
6
4
R
= 16 Ω
L
60
40
8 Ω
16 Ω
20
0
2
0
0
2
4
6
8
10
0
2
4
6
8
10
P
(W)
P
(W)
o
o
VCC = 12 V.
Fig 10. Efficiency as function of output power.
Fig 11. Power dissipation as function of output power.
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Product specification
Rev. 02 — 14 February 2000
10 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
MGL958
0
handbook, halfpage
α
cs
(dB)
−20
−40
−60
−80
−100
2
3
4
5
10
10
10
10
10
f (Hz)
No bandpass filter applied.
Fig 12. Channel separation as function of frequency.
MGL956
0
SVRR
(dB)
−20
−40
B
CH2
CH1
−60
A
−80
2
3
4
5
10
10
10
10
10
f (Hz)
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.
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Product specification
Rev. 02 — 14 February 2000
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TDA8944J
2 x 7 W stereo BTL audio amplifier
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13. Internal circuitry
Table 9: Internal circuitry
Pin
Symbol
Equivalent circuit
6 and 8
12 and 9
IN1+ and IN1−
IN2+ and IN2−
V
CC
V
V
CC
CC
1.5 kΩ
1.5 kΩ
8, 9
6, 12
45 kΩ
45 kΩ
1/2 V
CC
(SVR)
1 : 1
1 : 1
MGL946
1 and 4
OUT1− and OUT1+
14 and 17
OUT2− and OUT2+
100 Ω
1, 4, 14, 17
40 Ω
1/2 V
CC
MGL947
10
MODE
V
CC
V
CC
1 kΩ
1 kΩ
10 kΩ
V
CC
10 kΩ
10
OFF
HIGH
MUTE
HIGH
MGL949
11
SVR
V
CC
Standby
20 kΩ
11
20 kΩ
MGL948
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Product specification
Rev. 02 — 14 February 2000
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TDA8944J
2 x 7 W stereo BTL audio amplifier
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14. Application information
+V
CC
1000 µF
100 nF
3
16
220 nF
R
IN1−
8
s
−
+
1
4
OUT1−
R
i
Symmetrical
input
C
45 kΩ
i
−
+
1.5
nF
+
−
R
L
8 Ω
1/2 V
CC
1/2 V
CC
220 nF
220 nF
R
i
+
−
OUT1+
45 kΩ
R
s
6
9
IN1+
Asymmetrical
input
C
TDA8944J
i
IN2−
220 nF
−
+
14
R
OUT2−
i
signal
GND
45 kΩ
−
+
1.5
nF
+
−
R
L
1/2 V
CC
1/2 V
CC
8 Ω
R
i
+
−
17 OUT2+
45 kΩ
V
12
10
CC
IN2+
V
CC
R
MODE
STANDBY/
MUTE LOGIC
20 kΩ
R
SHORT CIRCUIT
AND
TEMPERATURE
PROTECTION
C1
1/2 V
SVR 11
CC
MICROCONTROLLER
C2
signal
GND
10
µF
20 kΩ
C1 C2
MODE
2
15
Standby
Mute
On
0
0
1
0
1
0
GND
MGL950
ulpagewidth
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.
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Product specification
Rev. 02 — 14 February 2000
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TDA8944J
2 x 7 W stereo BTL audio amplifier
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54 mm
i
56 mm
OUT2−
ON
MUTE
OUT2+
+
−
10 µF
17
IN2−
220 nF
IN2+
1.5 nF
IN1−
IN1+
220 nF
V
CC
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 µF 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.
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Product specification
Rev. 02 — 14 February 2000
14 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
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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-611D 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.
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Product specification
Rev. 02 — 14 February 2000
15 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
16. Package outline
DBS17P: plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm)
SOT243-1
non-concave
D
h
x
D
E
h
view B: mounting base side
d
A
2
B
j
E
A
L
3
L
Q
c
2
v
M
1
17
e
e
m
w
M
1
Z
b
p
e
0
5
10 mm
scale
DIMENSIONS (mm are the original dimensions)
(1)
(1)
(1)
UNIT
A
A
b
c
D
d
D
E
e
e
e
E
j
L
L
3
m
Q
v
w
x
Z
2
p
h
1
2
h
17.0 4.6 0.75 0.48 24.0 20.0
15.5 4.4 0.60 0.38 23.6 19.6
12.2
11.8
3.4 12.4 2.4
3.1 11.0 1.6
2.00
1.45
2.1
1.8
6
mm
10
2.54 1.27 5.08
0.8
4.3
0.4 0.03
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
97-12-16
99-12-17
SOT243-1
Fig 16. DBS17P package outline.
9397 750 06861
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Product specification
Rev. 02 — 14 February 2000
16 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
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
The maximum permissible temperature of the solder is 260 °C; solder at this
temperature must not be in contact with the joints for more than 5 seconds. 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, SDIP, SIL
suitable
suitable[1]
[1] For SDIP packages, the longitudinal axis must be parallel to the transport direction of the
printed-circuit board.
9397 750 06861
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 14 February 2000
17 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
18. Revision history
Table 11: Revision history
Rev Date
CPCN
-
Description
02 000214
•
•
•
•
– Section 8.1 “Input configuration” on page 4 → 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
Section 8.5 “Built-in protection circuits” on page 6 → added
Table 5 on page 7:
•
•
•
– VCC(sc) value added 15 V
Table 6 on page 7:
•
– Rth(j-a) value added 40 K/W
Table 7 on page 7: V
Table 8 on page 8:
- mute mode - value Min 2.5 → changed to 3 V
•
•
MODE
•
•
•
•
•
•
•
Figure 14: figure adjusted
Section 14.2 “Thermal behaviour and heatsink calculation” on page 15: → added
Section 15.2 “Test conditions” on page 15: → added
01 990414
-
Preliminary specification; initial version.
9397 750 06861
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 14 February 2000
18 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
19. Data sheet status
Datasheet status
Product status Definition[1]
Objective specification
Development
This data sheet contains the design target or goal specifications for product development. Specification may
change in any manner without notice.
Preliminary specification Qualification
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design and
supply the best possible product.
Product specification
Production
This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any
time without notice in order to improve design and supply the best possible product.
[1]
Please consult the most recently issued data sheet before initiating or completing a design.
20. Definitions
21. Disclaimers
Short-form specification — The data in
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
a
short-form specification is
Life support — These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.
Right to make changes — Philips Semiconductors reserves the right to
make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve
design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
licence or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products
are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.
9397 750 06861
© Philips Electronics N.V. 2000 All rights reserved.
Product specification
Rev. 02 — 14 February 2000
19 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
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(SCA69)
9397 750 06861
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 14 February 2000
20 of 21
TDA8944J
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors
Input configuration . . . . . . . . . . . . . . . . . . . . . . 4
Power amplifier. . . . . . . . . . . . . . . . . . . . . . . . . 5
Headroom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Supply Voltage Ripple Rejection (SVRR). . . . . 6
Built-in protection circuits . . . . . . . . . . . . . . . . . 6
Printed-circuit board (PCB). . . . . . . . . . . . . . . 13
20
21
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
© Philips Electronics N.V. 2000.
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
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