Philips | TDA8944J | User's Manual | Philips TDA8944J User's Manual

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
c
c
■
■
■
■
■
■
■
■
■
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.
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
Philips 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
Package
Name
Description
Version
TDA8944J
DBS17P
plastic DIL-bent-SIL power package;
17 leads (lead length 12 mm)
SOT243-1
6. Block diagram
idth
VCC1
VCC2
3
16
1
IN1−
IN1+
OUT1−
8
6
4
OUT1+
TDA8944J
14
IN2−
IN2+
OUT2−
9
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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
2 of 21
TDA8944J
Philips 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
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
3 of 21
TDA8944J
Philips 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 × C i )
(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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
4 of 21
TDA8944J
Philips 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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
5 of 21
TDA8944J
Philips 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).
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
6 of 21
TDA8944J
Philips 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
Value
Unit
Rth(j-a)
thermal resistance from junction to ambient
in free air
40
K/W
Rth(j-mb)
thermal resistance from junction to mounting base both channels driven
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
∆VOUT
[3]
VMODE
IMODE
[1]
[2]
[3]
[2]
differential output voltage offset
mode selection input voltage
mode selection input current
[1]
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 (∆VOUT) divided by the load resistance (RL).
The DC output voltage with respect to ground is approximately 0.5VCC.
∆VOUT = VOUT+ − VOUT− 
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
7 of 21
TDA8944J
Philips 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
20
16
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]
[2]
[3]
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.
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.
Output voltage in mute mode is measured with an input voltage of 1 V (RMS) in a bandwidth of 20 kHz, so including noise.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
8 of 21
TDA8944J
Philips 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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
9 of 21
TDA8944J
Philips 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
8
RL = 8 Ω
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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
10 of 21
TDA8944J
Philips 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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
11 of 21
TDA8944J
Philips 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
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
12 of 21
TDA8944J
Philips 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
45 kΩ
220 nF
Rs
1000 µF
1 OUT1−
+
+
−
RL
8Ω
1/2 VCC
+
6
4 OUT1+
−
IN1+
Asymmetrical
Ci
input
TDA8944J
IN2− 9
220 nF
−
Ri
45 kΩ
signal
GND
1.5
nF
−
1/2 VCC
VCC
12
+
Ri
45 kΩ
signal
GND
C2
MODE
C1
C2
Standby
Mute
On
0
0
1
0
1
0
17 OUT2+
VCC
STANDBY/
MUTE LOGIC
20 kΩ
R
MICROCONTROLLER
RL
8Ω
1/2 VCC
−
IN2+
C1
+
−
+
R
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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
13 of 21
TDA8944J
Philips Semiconductors
2 x 7 W stereo BTL audio amplifier
54 mm
idth
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 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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
14 of 21
TDA8944J
Philips 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-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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
15 of 21
TDA8944J
Philips 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
d
A2
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)
e
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
2.54
e1
e2
1.27 5.08
Eh
j
L
L3
m
Q
v
w
x
Z (1)
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
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
REFERENCES
IEC
JEDEC
EIAJ
EUROPEAN
PROJECTION
ISSUE DATE
97-12-16
99-12-17
SOT243-1
Fig 16. DBS17P package outline.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
16 of 21
TDA8944J
Philips 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
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
DBS, DIP, HDIP, SDIP, SIL
[1]
Dipping
Wave
suitable
suitable [1]
For SDIP packages, the longitudinal axis must be parallel to the transport direction of the
printed-circuit board.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
17 of 21
TDA8944J
Philips 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.
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
18 of 21
TDA8944J
Philips Semiconductors
2 x 7 W stereo BTL audio amplifier
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 a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
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.
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.
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.
© Philips Electronics N.V. 2000 All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
19 of 21
TDA8944J
Philips Semiconductors
2 x 7 W stereo BTL audio amplifier
Philips Semiconductors - a worldwide company
Argentina: see South America
Australia: Tel. +61 2 9704 8141, Fax. +61 2 9704 8139
Austria: Tel. +43 160 101, Fax. +43 160 101 1210
Belarus: Tel. +375 17 220 0733, Fax. +375 17 220 0773
Belgium: see The Netherlands
Brazil: see South America
Bulgaria: Tel. +359 268 9211, Fax. +359 268 9102
Canada: Tel. +1 800 234 7381
China/Hong Kong: Tel. +852 2 319 7888, Fax. +852 2 319 7700
Colombia: see South America
Czech Republic: see Austria
Denmark: Tel. +45 3 288 2636, Fax. +45 3 157 0044
Finland: Tel. +358 961 5800, Fax. +358 96 158 0920
France: Tel. +33 14 099 6161, Fax. +33 14 099 6427
Germany: Tel. +49 40 23 5360, Fax. +49 402 353 6300
Hungary: see Austria
India: Tel. +91 22 493 8541, Fax. +91 22 493 8722
Indonesia: see Singapore
Ireland: Tel. +353 17 64 0000, Fax. +353 17 64 0200
Israel: Tel. +972 36 45 0444, Fax. +972 36 49 1007
Italy: Tel. +39 039 203 6838, Fax +39 039 203 6800
Japan: Tel. +81 33 740 5130, Fax. +81 3 3740 5057
Korea: Tel. +82 27 09 1412, Fax. +82 27 09 1415
Malaysia: Tel. +60 37 50 5214, Fax. +60 37 57 4880
Mexico: Tel. +9-5 800 234 7381
Middle East: see Italy
Netherlands: Tel. +31 40 278 2785, Fax. +31 40 278 8399
New Zealand: Tel. +64 98 49 4160, Fax. +64 98 49 7811
Norway: Tel. +47 22 74 8000, Fax. +47 22 74 8341
Philippines: Tel. +63 28 16 6380, Fax. +63 28 17 3474
Poland: Tel. +48 22 5710 000, Fax. +48 22 5710 001
Portugal: see Spain
Romania: see Italy
Russia: Tel. +7 095 755 6918, Fax. +7 095 755 6919
Singapore: Tel. +65 350 2538, Fax. +65 251 6500
Slovakia: see Austria
Slovenia: see Italy
South Africa: Tel. +27 11 471 5401, Fax. +27 11 471 5398
South America: Tel. +55 11 821 2333, Fax. +55 11 829 1849
Spain: Tel. +34 33 01 6312, Fax. +34 33 01 4107
Sweden: Tel. +46 86 32 2000, Fax. +46 86 32 2745
Switzerland: Tel. +41 14 88 2686, Fax. +41 14 81 7730
Taiwan: Tel. +886 22 134 2865, Fax. +886 22 134 2874
Thailand: Tel. +66 27 45 4090, Fax. +66 23 98 0793
Turkey: Tel. +90 216 522 1500, Fax. +90 216 522 1813
Ukraine: Tel. +380 44 264 2776, Fax. +380 44 268 0461
United Kingdom: Tel. +44 208 730 5000, Fax. +44 208 754 8421
United States: Tel. +1 800 234 7381
Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: Tel. +381 11 3341 299, Fax. +381 11 3342 553
For all other countries apply to: Philips Semiconductors,
International Marketing & Sales Communications,
Building BE, P.O. Box 218, 5600 MD EINDHOVEN,
The Netherlands, Fax. +31 40 272 4825
Internet: http://www.semiconductors.philips.com
(SCA69)
© Philips Electronics N.V. 2000. All rights reserved.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
20 of 21
TDA8944J
Philips 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
© 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
Download PDF

advertising