1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

FEATURES

Differential inputs

Very high Common Mode Rejection Ratio (CMRR)

High common mode input signal handling

Requires very few external components

High output power

and 2

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 V

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 plop

Flexible leads

Low thermal resistance.

GENERAL DESCRIPTION

The TDA8566Q is an integrated class-B output amplifier
contained in a 17-lead single-in-line (SIL; bent to DIL)
plastic power package. The device contains two amplifiers
in a Bridge-Tied Load configuration (BTL). The output
power is 2

25 W in a 4

load or 2

40 W in a 2

load.

It has a differential input stage and two diagnostic outputs.
The device is primarily developed for car radio
applications.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

operating supply voltage

14.4

ORM

repetitive peak output current

7.5

q(tot)

total quiescent current

115

stb

stand-by current

0.1

100

switch-on current

input impedance

100

120

out

output power

= 4

: THD = 10%

= 2

: THD = 10%

SVRR

supply voltage ripple rejection

= 0

channel separation

= 10 k

CMRR

common mode rejection ratio

closed loop voltage gain

noise output voltage

= 0

120

DC output offset voltage

100

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA8566Q

DBS17P

plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm)

SOT243-1

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

PINNING

SYMBOL

PIN

DESCRIPTION

IN1+

channel 1 input positive

IN1

channel 1 input negative

SGND

small signal ground

CLIP

clip-detection

supply voltage 1

OUT1+

channel 1 speaker output positive

PGND1

channel 1 negative power supply
(ground)

OUT1

channel 1 speaker output negative

n.c.

not connected

OUT2+

channel 2 speaker output positive

PGND2

channel 2 negative power supply
(ground)

OUT2

channel 2 speaker output negative

supply voltage 2

MODE

mode select switch
(stand-by/mute/operating)

DIAG

short-circuit and temperature
pre-warning diagnostic

IN2+

channel 2 input positive

IN2

channel 2 input negative

Fig.2 Pin configuration.

handbook, halfpage

TDA8566Q

MGD101

IN1

SGND

CLIP

VP1

OUT1

PGND1

OUT1

n.c.

IN2

DIAG

MODE

VP2

OUT2

PGND2

OUT2

FUNCTIONAL DESCRIPTION

The TDA8566Q contains two 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 outputs

6. Differential inputs.

Mode select switch (pin 14)

Standby: low supply current (< 100

Mute: input signal suppressed

Operating: normal on condition.

Since this pin has a very low input current (< 40

A), a low

cost supply switch can be applied. To avoid switch-on
plops, it is advisable to keep the amplifier in the mute mode
for a period of

150 ms (charging the input capacitors at

pins 1, 2, 16 and 17). This can be realized by
microcontroller control or by an external timing circuit
(see Fig.7).

Clip detection (pin 4)

When clipping occurs at one or more output stages, the
dynamic distortion detector becomes active and pin 4
goes low. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and so limit the level of distortion. The output level
of pin 4 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 4 will remain at a high level. The clip detection
waveforms are illustrated in Fig.3.

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

Short-circuit diagnostic (pin 15)

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 15 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 approximately 50

s the load

condition is again checked to see if the short-circuit is still
present. Due to this duty cycle of 50

s/20 ms the average

current consumption during this short-circuit condition is
very low (approximately 40 mA). During this short-circuit
condition, pin 15 is low for 20 ms and high for 50

s (see

Fig.4). The power dissipation in any short-circuit condition
is very low.

Temperature pre-warning (pin 15)

When the junction temperature (T

) reaches 145

pin 15 will become continuously low.

Open-collector outputs

Pins 4 and 15 are open-collector outputs, therefore more
devices can be tied together. Pins 4 and 15 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.

Fig.3 Clip detection waveforms.

handbook, halfpage

Vout

MGD103

Fig.4 Short-circuit diagnostic timing diagram.

handbook, full pagewidth

MGA707

short-circuit over the load

20 ms

current

output

stage

V15

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

QUALITY SPECIFICATION

Quality specification in accordance with

UZW-FQ-611-E, if this type is used as an audio amplifier. The number of the

quality specification can be found in the

"Quality Reference Handbook". The handbook can be ordered using the code

9397 750 00192.

THERMAL CHARACTERISTICS

Thermal characteristics in accordance with (IEC 747-1).

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage

operating

non-operating

during 50 ms; load dump
protection t

rise

2.5 ms

OSM

non-repetitive peak output current

ORM

repetitive peak output current

7.5

stg

storage temperature

+150

virtual junction temperature

+150

amb

operating ambient temperature

+85

psc

short-circuit safe voltage

reverse polarity

6.0

tot

total power dissipation

SYMBOL

PARAMETER

VALUE

UNIT

th j-c

thermal resistance from junction to case

1.3

K/W

th j-a

thermal resistance from junction to ambient in free air

K/W

Fig.5 Equivalent thermal resistance network.

handbook, halfpage

2.2 K/W

0.2 K/W

2.2 K/W

virtual junction

output 1

output 2

case

MEA861 - 1

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

DC CHARACTERISTICS

= 14.4 V; T

amb

= 25

C; measured in test circuit of Fig.6; unless otherwise specified.

Notes

1. The circuit is DC adjusted at V

= 6 to 18 V and AC operating at V

= 8.5 to 18 V.

2. At V

= 18 to 30 V the DC output voltage

0.5V

AC CHARACTERISTICS

= 14.4 V; T

amb

= 25

C; R

= 4

; f

= 1 kHz; measured in test circuit of Fig.6; unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply voltage

supply voltage

note 1

14.4

quiescent current

115

180

Operating condition

ms(op)

mode select switch level

8.5

mode select switch current

= 14.4 V

output voltage

note 2

7.0

output offset voltage

100

Mute condition

ms(mute)

mode select switch level

3.3

6.4

output voltage

note 2

7.0

output offset voltage

100

Standby condition

ms(stb)

mode select switch level

stb

standby current

0.1

100

Diagnostic

diagnostic output voltage

during any fault condition

0.6

temperature pre-warning

= 0.6 V

145

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

out

output power

THD = 0.5%

THD = 10%

THD = 30%

THD

total harmonic distortion

out

= 1 W

0.05

out

output power

= 13.5 V; THD = 0.5%

= 13.5 V; THD = 10%

power bandwidth

THD = 0.5%; P

out

1 dB

with respect to 16 W

20 to 20000

low frequency roll off

1 dB, note 1

high frequency roll off

1dB

kHz

closed loop voltage gain

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

Notes

1. Frequency response externally fixed.

2. V

ripple

= V

ripple(max)

= 2 V (p-p), R

= 0

3. Dynamic Distortion Detector (DDD) active, pin 4 is low.

4. Common mode rejection ratio measured at the output (over R

) with both inputs tied together,

common

3.5 V (RMS), f = 100 Hz to 10 kHz, R

= 0

5. Common mode rejection ratio measured at the output (over R

) with both inputs tied together, V

common

3.5 V (RMS),

f = 1 kHz, R

= 45 k

. The mismatch of the input coupling capacitors is excluded.

SVRR

supply voltage ripple
rejection

on; note 2

mute; note 2

standby; note 2

input impedance

differential

100

120

150

single-ended

input impedance mismatch

noise output voltage

on; B = 20 Hz to 20 kHz;
R

= 0

120

on; B = 20 Hz to 20 kHz;
R

= 10 k

100

mute; B = 20 Hz to 20 kHz;
independent of R

channel separation

out

= 16 W; R

= 10 k

channel unbalance

output signal voltage in
mute

= V

i(max)

= 1 V (RMS)

THD

total harmonic distortion

note 3; V

= 0.6 V

CMRR

common mode rejection
ratio

= 0

; note 4

= 45 k

, note 5

out

output power

THD = 0.5%; R

= 2

THD = 10%; R

= 2

THD = 30%; R

= 2

= 13.5 V; THD = 0.5%;

= 2

= 13.5 V; THD = 10%;

= 2

THD

total harmonic distortion

out

= 1 W; R

= 2

0.1

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

TEST AND APPLICATION INFORMATION

Fig.6 Stereo BTL test diagram.

handbook, full pagewidth

Rs/2

Vmode

Rs/2

Vin2

Vin1

10
k

RL2

RL1

220 nF

CLIP

DETECTOR

DIAGNOSTIC

INTERFACE

TDA8566Q

Vref

100

VP =
14.4 V

2200

F/16V

CLIP

DIAG

MGD104

Application notes

IAGNOSTIC OUTPUT

Special care must be taken in the PCB layout to separate
pin 4 from pins 1, 2, 16 and 17 to minimize the crosstalk
between the CLIP output and the inputs.

ODE 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 1, 2, 16 and 17). 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.

Fig.7 Mode select switch circuit.

handbook, halfpage

100 k

MGD102

10 k

100

mode

select

switch

Vsupply

1998 Sep 23

Philips Semiconductors

Product specification

25 W BTL stereo car radio power amplifier

with differential inputs and diagnostic outputs

TDA8566Q

SOLDERING

Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

"Data Handbook IC26; Integrated Circuit Packages"

(order code 9398 652 90011).

Soldering by dipping or by wave

The maximum permissible temperature of the solder is
260

C; solder at this temperature must not be in contact

with the joint 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 (T

stg 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.

Repairing soldered joints

Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, 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.

DEFINITIONS

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 customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

Data sheet status

Objective specification

This data sheet contains target or goal specifications for product development.

Preliminary specification

This data sheet contains preliminary data; supplementary data may be published later.

Product specification

This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). 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

Where application information is given, it is advisory and does not form part of the specification.

Internet: http://www.semiconductors.philips.com

Philips Semiconductors a worldwide company

SCA60

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.

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Printed in The Netherlands

545102/750/03/pp12

Date of release: 1998 Sep 23

Document order number:

9397 750 04335

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