2 × 40 W/2 Ω stereo BTL car radio
power amplifier with differential
inputs and diagnostic outputs
Objective specification
File under Integrated Circuits, IC01
2001 Apr 24
Page 2
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
FEATURES
• Differential inputs
• Very high Common Mode Rejection Ratio (CMRR)
• High common mode input signal handling
• Requires very few external components
• High output power
• 4 and 2 Ω load driving capability
• Low offset voltage at output
• Fixed gain
• Diagnostic facility (distortion, short-circuit and
temperature pre-warning)
• Good ripple rejection
• Mode select switch (operating, mute and standby)
• Load dump protection
• Short-circuit proof to ground, to VP and across the load
• Low power dissipation in any short-circuit condition
• Thermally protected
• Reverse polarity safe
• Protected against electrostatic discharge
• No switch-on/switch-off plops
• Low thermal resistance.
GENERAL DESCRIPTION
The TDA8566TH is an integratedclass-B output amplifier
contained in a 20-lead small outline plastic package. The
device contains 2 amplifiers in a Bridge-Tied Load (BTL)
configuration. The output power is 2 × 25Wina4Ωload
or 2 × 40 W in a 2 Ω load. It has a differential input stage
and 2 diagnostic outputs. The device is primarily
developed for car radio applications.
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
FUNCTIONAL DESCRIPTION
The TDA8566TH contains 2 identical amplifiers and can
be used for BTL applications. The gain of each amplifier is
fixed at 26 dB. Special features of this device are:
1. Mode select switch
2. Clip detection
3. Short-circuit diagnostic
4. Temperature pre-warning
5. Open-collector diagnostic outputs
6. Differential inputs.
Mode select switch (pin MODE)
• Standby: low supply current
• Mute: input signal suppressed
• Operating: normal on condition.
Since this pin has a very low input current (<40 µA), a low
cost supply switch can be applied. To avoid switch-on
plops,itisadvisabletokeeptheamplifier in the mute mode
for a period of ≥150 ms (charging the input capacitors at
pins IN1+, IN1−, IN2+ and IN2−). This can be realized by
using a microcontroller or by using an external timing
circuit as illustrated in Fig.7.
Clip detection (pin CLIP)
When clipping occurs at one or more output stages, the
dynamic distortion detector becomes active and pin CLIP
goes LOW. This information can be used to drive a sound
processor or a DC volume control to attenuate the input
signal and so limit the level of distortion. The output level
of pin CLIP is independent of the number of channels that
are being clipped. The clip detection circuit is disabled in a
short-circuit condition, so if a fault condition occurs at the
outputs, pin CLIP will remain at a HIGH level. The clip
detection waveforms are illustrated in Fig.3.
Short-circuit diagnostic (pin DIAG)
When a short-circuit occurs at one or more outputs to
ground or to the supply voltage, the output stages are
switched off until the short-circuit is removed and the
device is switched on again (with a delay of approximately
20 ms after the removal of the short-circuit). During this
short-circuit condition, pin DIAG is continuously LOW.
When a short-circuit occurs across the load of one or both
channels, the output stages are switched off for
approximately 20 ms. After that time the load condition is
checked during approximately 50 µs to see whether the
short-circuit is still present. Due to this duty cycle of
50 µs/20 ms the average current consumption during the
short-circuit condition is very low (approximately 40 mA).
During this condition, pin DIAG is LOW for 20 ms and
HIGH for 50 µs; see Fig.4. The power dissipation in any
short-circuit condition is very low.
Temperature pre-warning (pin DIAG)
When the junction temperature (Tvj) reaches 145 °C,
pin DIAG will become continuously LOW.
Open-collector diagnostic outputs
Pins DIAG and CLIP are open-collector outputs, therefore
more devices can be tied together. Pins DIAG and CLIP
can also be tied together. An external pull-up resistor is
required.
Differential inputs
The input stage is a high-impedance fully differential
balanced input stage that is also capable of operating in
a single-ended mode with one of the inputs capacitively
coupled to an audio ground. It should be noted that if a
source resistance is added (input voltage dividers) the
CMRR degrades to lower values.
TDA8566TH
handbook, halfpage
V
V
O
(V)
CLIP
(V)
0
0
MGU357
t (s)
Fig.3 Clip detection waveforms.
2001 Apr 245
Page 6
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
handbook, full pagewidth
current
in
output
stage
V
DIAG
(V)
short-circuit over the load
20 ms
50 µs
Fig.4 Short-circuit diagnostic timing diagram.
TDA8566TH
MGU360
t (s)
t (s)
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
1. Dynamic distortion detector active; pin CLIP is LOW.
2. Frequency response externally fixed.
3. V
ripple=Vripple(max)
4. Noise measured in a bandwidth of 20 Hz to 20 kHz.
5. Common mode rejection ratio measured at the output (over RL) with both inputs tied together;
V
common
6. Common mode rejection ratio measured at the output (over RL) with both inputs tied together;
V
common
output signal voltage in mute Vin=V
R
=0Ω; note 56075−dB
s
ratio
R
=45kΩ; note 640−−dB
s
= 1 V (RMS)−−2mV
in(max)
= 2 V (p-p); Rs=0Ω.
≤ 3.5 V (RMS); fi= 100 Hz to 10 kHz; Rs=0Ω.
≤ 3.5 V (RMS); fi= 1 kHz; Rs=45kΩ. The mismatch of the input coupling capacitors is excluded.
2001 Apr 249
Page 10
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
TEST AND APPLICATION INFORMATION
handbook, full pagewidth
V
in1
V
in2
V
Rs/2
Rs/2
Rs/2
Rs/2
mode
220 nF
220 nF
220 nF
220 nF
+
_
8
+
201912
60
kΩ
+
−
TDA8566TH
60
kΩ
_
9
V
ref
+
−
10
2
+
60
kΩ
60
kΩ
_
3
−
+
+
−
−
+
CLIP
DETECTOR
DIAGNOSTIC
INTERFACE
1417
TDA8566TH
+
V
100
nF
13
+
_
15
11
1
16
+
_
18
2200
µF/16V
R
L1
V
V
P
P
10
10
kΩ
kΩ
CLIP
DIAG
R
L2
_
P =
14.4 V
Fig.6 Stereo BTL test diagram.
Application information
DIAGNOSTIC OUTPUT
Special care must be taken in the PCB layout to separate
pin CLIPfrom pins IN1+, IN1−, IN2+ and IN2− to minimize
the crosstalk between the CLIP output and the inputs.
MODE SELECT SWITCH
To avoid switch-on plops, it is advisable to keep the
amplifier in the mute mode during ≥150 ms (charging of
the input capacitors at pins IN1+, IN1−, IN2+ and IN2−).
The circuit in Fig.7 slowly ramps-up the voltage at the
mode select switch pin when switching on and results in
fast muting when switching off.
handbook, halfpage
MGU359
+V
supply
S
10 kΩ
47 µF
100 Ω
100 kΩ
mode
select
switch
MGD102
Fig.7 Mode select switch circuit.
2001 Apr 2410
Page 11
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
2. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
A
2
max.
3.5
3.50.35
3.2
e
(1)
bpc
A
A
4
3
+0.12
0.53
−0.02
0.40
0.32
0.23
D
16.0
15.8
11
w M
b
p
0510 mm
scale
(2)
D
1
13.0
12.6
D
1.1
0.9
(2)
E
E
2
11.1
10.9
1
6.2
5.8
E
2.9
2.5
Q
A
2
A
4
detail X
H
L
Q
1.7
1.5
v
0.25w0.25
e
E
14.5
13.9
p
1.1
0.8
2
1.27
L
x
0.03
(A3)
p
0.07
A
θ
yZ
2.5
2.0
θ
8°
0°
OUTLINE
VERSION
SOT418-2
IEC JEDEC EIAJ
REFERENCES
2001 Apr 2411
EUROPEAN
PROJECTION
ISSUE DATE
98-02-25
99-11-12
Page 12
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
SOLDERING
Introduction to soldering surface mount packages
Thistext gives a very brief insighttoa complex technology.
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).
There is no soldering method that is ideal for all surface
mount IC packages. Wave soldering can still be used for
certainsurface mount ICs, but itisnot suitable for fine pitch
SMDs. In these situations reflow soldering is
recommended.
Reflow soldering
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
tothe printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several methods exist for reflowing; for example,
convection or convection/infrared heating in a conveyor
type oven. Throughput times (preheating, soldering and
cooling) vary between 100 and 200 seconds depending
on heating method.
Typical reflow peak temperatures range from
215 to 250 °C. The top-surface temperature of the
packages should preferable be kept below 220 °C for
thick/large packages, and below 235 °C for small/thin
packages.
Wave soldering
Conventional single wave soldering is not recommended
forsurface mount devices (SMDs) orprinted-circuitboards
with a high component density, as solder bridging and
non-wetting can present major problems.
To overcome these problems the double-wave soldering
method was specifically developed.
If wave soldering is used the following conditions must be
observed for optimal results:
• Use a double-wave soldering method comprising a
turbulent wave with high upward pressure followed by a
smooth laminar wave.
• For packages with leads on two sides and a pitch (e):
– larger than or equal to 1.27 mm, the footprint
longitudinal axis is preferred to be parallel to the
transport direction of the printed-circuit board;
– smaller than 1.27 mm, the footprint longitudinal axis
must be parallel to the transport direction of the
printed-circuit board.
The footprint must incorporate solder thieves at the
downstream end.
• Forpackages with leads on foursides,the footprint must
be placed at a 45° angle to the transport direction of the
printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Manual soldering
Fix the component by first soldering two
diagonally-opposite end leads. Use a low voltage (24 V or
less) soldering iron applied to the flat part of the lead.
Contact time must be limited to 10 seconds at up to
300 °C.
When using a dedicated tool, all other leads can be
soldered in one operation within 2 to 5 seconds between
270 and 320 °C.
TDA8566TH
2001 Apr 2412
Page 13
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
TDA8566TH
with differential inputs and diagnostic outputs
Suitability of surface mount IC packages for wave and reflow soldering methods
1. All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum
2. These packages are not suitable for wave soldering as a solder joint between the printed-circuit board and heatsink
3. If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave direction.
4. Wave soldering is only suitable for LQFP, TQFP and QFP packages with a pitch (e) equal to or larger than 0.8 mm;
5. Wave soldering is only suitable for SSOP and TSSOP packages with a pitch (e) equal to or larger than 0.65 mm; it is
, SO, SOJsuitablesuitable
temperature (with respect to time) and body size of the package, there is a risk that internal or external package
cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the
Drypack information in the
(at bottom version) can not be achieved, and as solder may stick to the heatsink (on top version).
The package footprint must incorporate solder thieves downstream and at the side corners.
it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.
Objective dataDevelopmentThis data sheet contains data from the objective specification for product
Preliminary dataQualificationThis data sheet contains data from the preliminary specification.
Product dataProductionThis data sheet contains data from the product specification. Philips
Notes
1. Please consult the most recently issued data sheet before initiating or completing a design.
2. The product status of the device(s) described in this data sheet may have changed since this data sheet was
published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.
(1)
STATUS
(2)
development. Philips Semiconductors reserves the right to change the
specification in any manner without notice.
Supplementary data will be published at a later date. Philips
Semiconductors reserves the right to change the specification without
notice, in order to improve the design and supply the best possible
product.
Semiconductors reserves the right to make changes at any time in order
to improve the design, manufacturing and supply. Changes will be
communicated according to the Customer Product/Process Change
Notification (CPCN) procedure SNW-SQ-650A.
DEFINITIONS
DEFINITIONS
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.
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
atthese or at any other conditions above thosegivenin 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
norepresentation or warranty thatsuch applications will be
suitable for the specified use without further testing or
modification.
DISCLAIMERS
Life support applications 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
Semiconductorscustomers using or sellingthese 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.
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
theuse of any of theseproducts,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.
2001 Apr 2414
Page 15
Philips SemiconductorsObjective specification
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
NOTES
TDA8566TH
2001 Apr 2415
Page 16
Philips Semiconductors – a w orldwide compan y
Argentina: see South America
Australia: 3 Figtree Drive, HOMEBUSH, NSW 2140,
United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. +1 800 234 7381, Fax. +1 800 943 0087
Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,
Tel. +381 11 3341 299, Fax.+381 11 3342 553
For all other countries apply to: Philips Semiconductors,
Marketing Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN,
The Netherlands, Fax. +31 40 27 24825
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.
2001
Internet: http://www.semiconductors.philips.com
72
Printed in The Netherlands753503/01/pp16 Date of release: 2001 Apr 24Document order number: 9397 750 08125
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