Philips TDA8946J User manual

TDA8946J
2 x 15 W stereo Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 14 March 2000 Product specification
c
c
1. General description
The TDA8946J is a dual-channel audio power amplifier with an output power of
2×15Watan8Ωload and a 18 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8946J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8946J 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.
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 Max Unit
VCC supply voltage 6 18 25 V
Iqquiescent supply current VCC =18V;R
L=∞- 2842mA
Istb standby supply current - - 10 µA

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 2 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
5. Ordering information
6. Block diagram
Pooutput power THD = 10%; RL=8Ω;
VCC =18V 13 15 - W
THD total harmonic distortion Po= 1 W - 0.03 0.1 %
Gvvoltage gain 31 32 33 dB
SVRR supply voltage ripple
rejection 50 65 - dB
Table 1: Quick reference data
…continued
Symbol Parameter Conditions Min Typ Max Unit
Table 2: Ordering information
Type number Package
Name Description Version
TDA8946J DBS17P plastic DIL-bent-SIL power package;
17 leads (lead length 12 mm) SOT243-1
Fig 1. Block diagram.
i
dth
MBK929
STANDBY/
MUTE LOGIC SHORT CIRCUIT
AND
TEMPERATURE
PROTECTION
20
kΩ
20
kΩ
9
12 17
14
10
11
VCC1
VCC
2
3
OUT2+
GND1
15
GND2
SVR
OUT2−
IN2−
IN2+
8
TDA8946J
64
1
VCC2
16
OUT1+
OUT1−
IN1−
IN1+
MODE

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 3 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
7. Pinning information
7.1 Pinning
7.2 Pin description
Fig 2. Pin configuration.
handbook, halfpage
TDA8946J
MBK932
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
OUT1−
GND1
VCC1
OUT1+
n.c.
IN1+
n.c.
IN1−
IN2−
MODE
SVR
IN2+
n.c.
OUT2−
GND2
VCC2
OUT2+
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 Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 4 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
8. Functional description
The TDA8946J is a stereo BTL audio power amplifier capable of delivering 2 ×15 W
output power to an 8 Ωload at THD = 10%, using a 18 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 TDA8946J outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
8.1 Input configuration
The TDA8946J 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)
For Ri=45kΩand Ci= 220 nF:
(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.
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
Table 3: Pin description
…continued
Symbol Pin Description
fi cut off–() 1
2πRiCi ×()
-----------------------------
=
fi cut off–() 1
2π45 103 ×220×10 9– ×()
-----------------------------------------------------------------16 Hz==

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 5 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
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.
8.2.1 Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10%; see Figure 8. The maximum output power is limited by the maximum
supply voltage of 18 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 =18V,R
L=8Ωand Po= 10 W at THD = 0.1% (see Figure 6), the
Average Listening Level (ALL) – music power – without any distortion yields:
Po(ALL) = 10 W/15.85 = 631 mW.
The power dissipation can be derived from Figure 11 on page 11 for 0 dB
respectively 12 dB headroom.
For the average listening level a power dissipation of 8 W can be used for a heatsink
calculation.
8.3 Mode selection
The TDA8946J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE. See Figure 4 and 5for 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 <V
CC, or when
the MODE pin is left floating (high impedance). The power consumption of the
TDA8946J will be reduced to <0.18 mW.
Table 4: Power rating as function of headroom
Headroom Power output (THD = 0.1%) Power dissipation (P)
0dB P
o=10W 18W
12 dB Po(ALL) = 631 mW 8 W

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 6 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
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
3V<V
MODE <(V CC −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 12 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 TDA8946J 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 0.7 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 3 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 Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 7 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
9. Limiting values
10. Thermal characteristics
11. Static characteristics
[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−
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
VIinput voltage −0.3 VCC + 0.3 V
IORM repetitive peak output current - 2 A
Tstg storage temperature non-operating −55 +150 °C
Tamb operating ambient temperature −40 +70 °C
Ptot total power dissipation - 28 W
VCC(sc) supplyvoltagetoguarantee short-circuit
protection -15V
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 4.5 K/W
Table 7: Static characteristics
V
CC
=18V;T
amb
=25 ° C; R
L
=8 Ω ; V
MODE
=0V;V
i
= 0 V; measured in test circuit Figure 14; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
VCC supply voltage operating 6 18 25 V
Iqquiescent supply current RL=∞[1] - 2842mA
Istb standby supply current VMODE =V
CC --10µA
VODC output voltage [2] -9-V
∆VOUT[3] differential output voltage offset - - 200 mV
VMODE mode selection input voltage operating mode 0 - 0.5 V
mute mode 3 - VCC −1.5 V
standby mode VCC −0.5 - VCC V
IMODE mode selection input current 0 < VMODE <V
CC --20µA

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 8 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
12. Dynamic characteristics
[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=0Ωat the input.
[2] Supply voltage ripple rejection is measured at the output, with a source impedance RS=0Ωat the input. The ripple voltage is a sine
wave with a frequency fripple and an amplitude of 700 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.
Fig 3. Quiescent supply current as function of supply
voltage. Fig 4. Quiescent supply current as function of mode voltage.
handbook, halfpage
50
40
30
20
10
00481216
VCC (V)
Iq
(mA)
20
MGU005
handbook, halfpage
50
40
30
20
10
00481216
VMODE (V)
Iq
(mA)
20
MGU006
VCC = 18 V
12 V
Table 8: Dynamic characteristics
V
CC
=18V;T
amb
=25 ° C; R
L
=8 Ω ; f = 1 kHz; V
MODE
= 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
Pooutput power THD = 10% 13 15 - W
THD = 0.5% 10 11.5 - W
THD total harmonic distortion Po= 1 W - 0.03 0.1 %
Gvvoltage gain 31 32 33 dB
Zi(dif) differential input impedance 70 90 110 kΩ
Vn(o) noise output voltage [1] - 90 120 µV
SVRR supply voltage ripple rejection fripple = 1 kHz [2] 50 65 - dB
fripple = 100 Hz
to 20 kHz [2] -60-dB
Vo(mute) output voltage mute mode [3] --50µV
αcs channel separation RS=0Ω50 75 - dB

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 9 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
Fig 5. Output voltage as function of mode voltage.
Fig 6. Total harmonic distortion as function of output power.
handbook, full pagewidth
VMODE (V) 20
MGU008
1684120
Vo
(V)
10
1
10−3
10−2
10−1
10−4
10−5
VCC = 18 V
12 V
handbook, halfpage
THD
(%)
10−2102
10110−1Po(W)
102
10
1
10−1
10−2
MGU003
VCC = 12 V 18 V

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 10 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
No bandpass filter applied.
Fig 7. Total harmonic distortion as function of frequency.
THD = 10%.
Fig 8. Output power as function of supply voltage. Fig 9. Total power dissipation as function of supply
voltage.
handbook, full pagewidth
10
1
10−1
10−2
10 102103104105106
MGU004
VCC = 12 V
VCC = 18 V
VCC = 12 V
VCC = 18 V
Po= 0.1 W
Po= 1 W
THD
(%)
f (Hz)
handbook, halfpage
20
16
8
4
12
00481216
VCC (V)
Po
(W)
20
MGU010
RL= 8 Ω
16 Ω
handbook, halfpage
20
16
8
4
12
00481216
VCC (V)
Ptot
(W)
20
MGU011
RL= 8 Ω
16 Ω

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 11 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
VCC =18V. V
CC =18V.
Fig 10. Efficiency as function of output power. Fig 11. Power dissipation as function of output power.
No bandpass filter applied.
Fig 12. Channel separation as function of frequency.
handbook, halfpage
100
80
40
20
60
00481216
MGU013
RL= 16 Ω
8 Ω
Po(W)
η
(%)
handbook, halfpage
20
16
8
4
12
00481216
P
(W)
MGU012
RL= 8 Ω
16 Ω
Po(W)
handbook, halfpage
0
−20
−40
−60
−80
−100
10 102103104105
f (Hz)
αcs
(dB)
MGU009

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 12 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
VCC = 18 V; RS=0Ω; Vripple = 700 mV (RMS); 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.
handbook, full pagewidth
SVRR
(dB)
102103104105
10 f (Hz)
−20
0
−40
−60
−80
MGU007
CH1
B
A
CH2

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 13 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
13. Internal circuitry
Table 9: Internal circuitry
Pin Symbol Equivalent circuit
6 and 8 IN1+ and IN1−
12 and 9 IN2+ and IN2−
1 and 4 OUT1- and OUT1+
14 and 17 OUT2−and OUT2+
10 MODE
11 SVR
1.5 kΩ1.5 kΩ
45 kΩ45 kΩ
VCC
VCC VCC
MGL946
1/2 VCC
(SVR)
8, 9 6, 12
40 Ω
100 Ω
MGL947
1, 4, 14, 17
1/2 VCC
1 kΩ
20 kΩ
OFF
HIGH MUTE
HIGH
1 kΩ
VCC
VCC
VCC
MGL949
10
Standby
20 kΩ
20 kΩ
VCC
MGL948
11

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 14 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
14. Application information
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.
Fig 14. Application diagram.
a
gewidth
316
OUT1−
−
−−
+
++
+
−
RL
8 Ω
Ri
45 kΩ
Rs
Symmetrical
input
Ri
45 kΩ
RL
8 Ω
OUT1+
IN1−
IN1+
OUT2−
OUT2+
GND
MGU014
IN2−
IN2+
MODE
SVR
1
8
220 nF
6
9
12
10
11
4
14
17
152
+VCC
1000 µF
100 nF
20 kΩ
20 kΩ
10
µF
−
−−
+
++
+
−
Ri
45 kΩ
Ri
45 kΩ
30 kΩ
30 kΩ
30 kΩ
R
C1
C2
R
VCC
VCC
signal
GND
TDA8946J
signal
GND
SHORT CIRCUIT
AND
TEMPERATURE
PROTECTION
STANDBY/
MUTE LOGIC
MICROCONTROLLER
Standby
MODE
Mute
On
0
0
1
0
C1 C2
1
0
1/2 VCC
220 nF
1.5
nF
1.5
nF
Ci
Rs
Asymmetrical
input
220 nF
220 nF
Ci
1/2 VCC 1/2 VCC
1/2 VCC
1/2 VCC

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 15 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
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.
Fig 15. Printed-circuit board layout (single-sided); components view.
i
dth
MGU069
ON
MUTE
220 nF
100 nF
1.5 nF
1000 µF
10 µF
220 nF
1
17
+−
IN2−
IN2+
IN1−
IN1+
OUT1−
OUT1+
OUT2−
OUT2+
VCC
GND
54 mm
56 mm

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 16 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
14.2 Thermal behaviour and heatsink calculation
The measured maximum thermal resistance of the IC package, Rth(j-mb) is 4.5 K/W.
A calculation for the heatsink can be made, with the following parameters:
Tamb(max) =50°C
VCC = 18 V and RL=8Ω
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 =12VandR
L=8Ωthe measured worst-case sine-wave dissipation is 18 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) = 100/18 = 5.56 K/W
Rth(h-a) =R
th(tot) –R th(j-mb) = 5.56 – 4.5 = 1.06 K/W.
The calculation above is for an application at worst-case (stereo) sine-wave output
signals. In practice music signals will be applied, which decreases the maximum
power dissipation to approximately half of the sine-wave power dissipation (see
Section 8.2.2). This allows for the use of a smaller heatsink:
P×Rth(tot) = 100 °C
Rth(tot) = 100/8 = 12.5 K/W
Rth(h-a) =R
th(tot) –R th(j-mb) = 12.5 – 4.5 = 8.0 K/W.
To increase the lifetime of the IC, Tj(max) should be reduced to 125 °C. This requires a
heatsink of approximately 4 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 = 18 V; f = 1 kHz; RL=8Ω; 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 Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 17 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
16. Package outline
Fig 16. DBS17P package outline.
REFERENCES
OUTLINE
VERSION EUROPEAN PROJECTION ISSUE DATE
IEC JEDEC EIAJ
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
SOT243-1
0 5 10 mm
scale
D
L
E
A
c
A2
L3
Q
wM
bp
1
d
D
Ze
e
xh
117
j
Eh
non-concave
97-12-16
99-12-17
DBS17P: plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1
view B: mounting base side
m2
e
vM
B
UNIT A e1 A2bpcD
(1) E(1) Z(1)
deDhLL
3m
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 2.54
v
0.8
12.2
11.8 1.27
e2
5.08 2.4
1.6
Eh
62.00
1.45
2.1
1.8
3.4
3.1 4.3
12.4
11.0
Qj
0.4
w
0.03
x

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 18 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
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
[1] For SDIP packages, the longitudinal axis must be parallel to the transport direction of the
printed-circuit board.
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]

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 19 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
18. Revision history
Table 11: Revision history
Rev Date CPCN Description
02 20000314 - Product specification; second version; supersedes initial version TDA8946J-01 of
14 April 1999 (9397 750 04882). Modifications:
•Table 1 on page 1: SVRR; Typ value 65 dB →added
•Ordering options removed
•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
•Table 3 on page 3: Pin description; 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 >(V
CC −0.5 V) →changed to (VCC −0.5 V) < VMODE <V CC;
The power consumption of the TDA8946J 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 <(V
CC −1.5 V) →changed to 3 V < VMODE <(V CC −1.5 V)
–Section 8.3.1 “Switch-on and switch-off” on page 6 →added
•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 28 W
–VCC(sc) value added 15 V
•Table 6 on page 7:
–Rth(j-a) value added 40 K/W
–Rth(j-c) value 10 k/W →changed to Rth(j-mb) value 4.5 K/W;
condition ‘in free air’ →changed to ‘both channels driven’
•Table 7 on page 7: VCC: Max value 18 V changed to →25 V; 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
–Rsource changed to →RSin table and associated table notes; Value added RS=0Ω;
–Table note [2]: .... 100 mV (RMS).... changed to →... 700 mV (RMS)....
•Figure 3 to 13: figures added
•Section 13 “Internal circuitry” on page 13:→added
•Figure 14: figure modified

Philips Semiconductors TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification Rev. 02 — 14 March 2000 20 of 23
9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved.
02 20000314 - Modifications:
•Section 14.1 “Printed-circuit board (PCB)” on page 14:→added
•Figure 15: figure added
•Section 14.2 “Thermal behaviour and heatsink calculation” on page 16:→added
•Section 15 “Test information” on page 16:Section 15.1 →updated
•Section 15.2 “Test conditions” on page 16:→added
01 19990414 - Preliminary specification; initial version.
Table 11: Revision history
…continued
Rev Date CPCN Description