TDA8564Q.PDF

Philips Semiconductors

Preliminary specication

12 W single-ended

car radio power amplier

24 W BTL or 4

TDA8564Q

FEATURES

Electrostatic discharge protection

Requires very few external components

No switch-on/switch-off plop

High output power

Flexible leads

Flexibility in use - Quad single-ended or stereo BTL

Low thermal resistance

Low output offset voltage

Identical inputs (inverting and non-inverting).

Fixed gain

Diagnostic facility (distortion, short-circuit and

temperature detection)

GENERAL DESCRIPTION

The TDA8564Q is an integrated class-B output amplifier in

a 17-lead DIL-bent-SIL power package. It contains

Good ripple rejection

Mode select switch (operating, mute and standby)

12 W single-ended or 2

24 W bridge amplifiers.

Load dump protection

APPLICATIONS

AC and DC short-circuit safe to ground and to V P

The device is primarily developed for car radio

applications.

Low power dissipation in any short-circuit condition

Thermally protected

Reverse polarity safe

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

V P

operating supply voltage

6.0

14.4 18.0 V

I ORM

repetitive peak output current

I q(tot)

total quiescent current

I stb

standby current

0.1

100

m A

Stereo BTL application

P o

output power

R L = 4 W ; THD = 10%

SVRR

supply voltage ripple rejection

V no

noise output voltage

R s = 0 W

200

m V

Z I |

input impedance

|D V O |

DC output offset voltage

250

Quad single-ended application

P o

output power

R L = 4 W ; THD = 10%

6.4

R L = 2 W ; THD = 10%

SVRR

supply voltage ripple rejection

V no

noise output voltage

R s = 0 W

200

m V

| Z I |

input impedance

k W

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME

DESCRIPTION

VERSION

TDA8564Q

DBS17P plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1

February 1995

Philips Semiconductors

Preliminary specication

12 W single-ended car

radio power amplier

24 W BTL or 4

TDA8564Q

BLOCK DIAGRAM

handbook, full pagewidth

V P1

V P2

non-inverting

input 1

mute switch

C m

TDA8564Q

output 1

180

18 k

power stage

mute switch

C m

inverting

input 2

output 2

180

18 k

power stage

V P

mode

select

switch

stand-by

switch

standby

reference

voltage

PROTECTIONS

thermal

short-circuit

15 k

mute

switch

diagnostic

output

supply voltage

ripple rejection

15 k

mute

reference

voltage

non-inverting

input 4

mute switch

C m

output 4

180

18 k

power stage

mute switch

C m

inverting

input 3

output 3

180

input

reference

voltage

18 k

power stage

GND1

GND2

MLC809

ground

(signal)

not connected

power ground (substrate)

Fig.1 Block diagram.

February 1995

Philips Semiconductors

Preliminary specication

12 W single-ended car

radio power amplier

24 W BTL or 4

TDA8564Q

PINNING

SYMBOL

DESCRIPTION

INV1

non-inverting input 1

handbook, halfpage

INV1

SGND

signal ground

SGND

INV2

inverting input 2

INV2

SVRR

supply voltage ripple rejection

SVRR

V P1

supply voltage 1

OUT1

output 1

V P1

GND1

power ground 1

OUT1

OUT2

output 2

GND1

n.c.

not connected

OUT2

OUT3

output 3

n.c.

TDA8564Q

GND2

power ground 2

OUT3

OUT4

output 4

V P2

supply voltage 2

GND2

MODE

mode select switch input

OUT4

INV3

inverting input 3

V DIAG

diagnostic output

MODE

INV4

non-inverting input 4

INV3

DIAG

FUNCTIONAL DESCRIPTION

The TDA8564Q contains four identical amplifiers which

can be used for single-ended or bridge applications. The

gain of each amplifier is fixed at 40 dB (46 dB in BTL).

Special features of the device are as follows.

INV4

MLC810

Fig.2 Pin configuration.

Mode select switch (pin 14)

· Low standby current (<100 m A)

· Low switching current (low cost supply switch)

· Mute facility.

To avoid switch-on plops, it is advised to keep the amplifier

in the mute mode during ³ 100 ms (charging of the input

capacitors at pins 1, 3, 15 and 17).

This can be achieved by:

· Microcontroller control

· External timing circuit (see Fig.3).

The circuit in Fig.3 slowly ramps up the voltage at the

mode select switch pin when switching on and results in

fast muting when switching off.

In the event of fast switching at mode select pin it is

advised to increase the 1

handbook, halfpage

V P

10 k

mode

select

switch

100 k

MGA708

¤ 2 V P decoupling capacitor (pin 4)

to 150 m F to avoid switch plops.

Fig.3 Mode select switch circuitry.

February 1995

Philips Semiconductors

Preliminary specication

12 W single-ended car

radio power amplier

24 W BTL or 4

TDA8564Q

Diagnostic output (pin 16)

D YNAMIC DISTORTION DETECTOR (DDD)

At the onset of clipping of one or more output stages, the

dynamic distortion detector becomes active and pin 16

goes LOW. This information can be used to drive a sound

processor or DC volume control to attenuate the input

signal and thus limit the distortion. The output level of

pin 16 is independent of the number of channels that are

clipping (see Figs 4 and 5).

approximately 20 ms. After that time it is checked during

approximately 50 m s to see whether the short-circuit is still

present. Due to this duty cycle of 50 m s/20 ms the average

current consumption during this short-circuit condition is

very low (approximately 40 mA).

During this short-circuit condition, pin 16 is LOW for 20 ms

and HIGH for 50 m s (see Fig.6).

The power dissipation in any short-circuit condition is

very low.

S HORT - CIRCUIT PROTECTION

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 removal of the short-circuit. During this

short-circuit condition, pin 16 is continuously LOW.

When a short-circuit across the load of one or more

channels occurs the output stages are switched off during

T EMPERATURE DETECTION

When the virtual junction temperature T vj reaches 150

pin 16 will be active LOW.

O PEN - COLLECTOR OUTPUT

Pin 16 is an open-collector output, which allows pin 16 of

more devices being tied together.

handbook, halfpage

V O

MGA705

handbook, halfpage

V O

MGA706

V 16

V P

Fig.4 Distortion detector waveform; BTL application.

Fig.5 Distortion detector waveform; single-ended

application.

handbook, full pagewidth

current

output

stage

MGA707

short-circuit over the load

V 16

20 ms

V P

Fig.6 Short-circuit waveform.

February 1995

Philips Semiconductors

Preliminary specication

12 W single-ended car

radio power amplier

24 W BTL or 4

TDA8564Q

LIMITING VALUES

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

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

V P

supply voltage

operating

non-operating

load dump protection

during 50 ms; t r ³ 2.5 ms

V psc

AC and DC short-circuit safe voltage

V pr

reverse polarity

I OSM

non-repetitive peak output current

I ORM

repetitive peak output current

P tot

total power dissipation

T stg

storage temperature

- 55

+150

° C

T amb

operating ambient temperature

+85

T vj

virtual junction temperature

150

° C

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

VALUE

UNIT

R th j-a

thermal resistance from junction to ambient in free air

K/W

R th j-c

thermal resistance from junction to case (see Figs 7 and 8)

1.3

K/W

handbook, halfpage

virtual junction

output 1 output 2

output 3 output 4

handbook, halfpage

output 1

output 2

virtual junction

3.0 K/W

2.2 K/W

0.7 K/W

0.2 K/W

MEA861 - 1

case

MEA860 - 2

0.2 K/W

case

Fig.7 Equivalent thermal resistance network;

BTL application.

Fig.8 Equivalent thermal resistance network;

single-ended application.

February 1995

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