Philips TDA8566 User Manual

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier with
differential inputs and diagnostic outputs

Rev. 06 — 15 October 2007 Product data sheet

1. General description

The TDA8566 is an integrated class-B output amplifier which is available in several
packages. TDA8566TH is contained in a 20-lead small outline plastic package. The
TDA8566TH1 is a 24-lead small outline plastic package which is pin compatible with the
I2C-bus controlled amplifier TDA1566TH for one board layout. TDA8566Q is a 17-pin
DIL-bent-SIL package.

The device contains 2 amplifiers in a Bridge-Tied Load (BTL) configuration. The output
power is 2 × 25 W in a 4 Ω load 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. Features

n Differential inputs
n Very high Common Mode Rejection Ratio (CMRR)
n High common mode input signal handling
n Requires very few external components
n High output power
n 4 Ω and 2 Ω load driving capability
n Low offset voltage at output
n Fixed gain
n Diagnostic facility (distortion, short-circuit and temperature pre-warning)
n Good ripple rejection
n Mode select switch (operating, mute and standby)
n Load dump protection
n Short-circuit proof to ground, to VP and across the load
n Low power dissipation in any short-circuit condition
n Thermally protected
n Reverse polarity safe
n Protected against electrostatic discharge
n No switch-on/switch-off plops
n Low thermal resistance
n TDA8566TH1 is pin compatible with TDA1566TH

NXP Semiconductors

3. Quick reference data

Table 1. Quick reference data

VP= 14.4 V; T
specified.

Symbol Parameter Conditions Min Typ Max Unit

V

P

I

ORM

I

q

I

stb

Z

i

P

o

SVRR supply voltage ripple

α

cs

CMRR common mode rejection

G

v

V

n(o)

[1] The circuit is DC adjusted at VP= 6 V to 18 V and AC operating at VP= 8.5 V to 18 V.
[2] V
[3] Common mode rejection ratio measured at the output (over RL) with both inputs tied together;

[4] Noise measured in a bandwidth of 20 Hz to 20 kHz.

supply voltage
repetitive peak output

current
quiescent current RL= ∞Ω - 115 180 mA
standby current - 0.1 10 µA
input impedance differential 100 120 150 kΩ
output power RL=4Ω; THD = 10 % 21 25 - W

rejection
channel separation Po= 25 W; Rs=10kΩ 45 50 - dB

ratio
closed loop voltage gain 25 26 27 dB
noise output voltage operating; Rs=0Ω

ripple=Vripple(max)

V

≤ 3.5 V (RMS); fi= 100 Hz to 10 kHz; Rs=0Ω.

common

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier

=25°C; fi= 1 kHz; measured in test circuit of Figure 9; unless otherwise

amb

[1]

6 14.4 18 V

- - 7.5 A

=2Ω; THD = 10 % 33 40 - W

R

L

[2]

operating

R

= 2 V (p-p); Rs=0Ω.

=0Ω

s

50 60 - dB

[3]

60 75 - dB

[4]

- 85 120 µV

4. Ordering information

Table 2. Ordering information

Type number Package

Name Description Version

TDA8566TH HSOP20 plastic, heatsink small outline package; 20 leads; low stand-off height SOT418-3
TDA8566TH1 HSOP24 plastic, heatsink small outline package; 24 leads; low stand-off height SOT566-3
TDA8566Q DBS17P plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1

TDA8566_6 © NXP B.V. 2007. All rights reserved.

Product data sheet Rev. 06 — 15 October 2007 2 of 21

NXP Semiconductors

5. Block diagram

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier

V

V

P2

P1

IN1+

IN1−

n.c.

SGND

IN2+

mute
switch

V

A

2.3
kΩ

mute
switch

V

A

60

60

kΩ

kΩ

2.3
kΩ

standby

switch

V

V

ref

A

standby

reference

voltage

C

M

2.3 kΩ
(9×)
C

M

2.3 kΩ
(9×)

TDA8566

mute

switch

CLIP

OUT1+

OUT1−

MODE

CLIP

1×

DIAG

DIAG

mute

60

60

kΩ

kΩ

reference
voltage

mute
switch

C

M

HEATTAB

IN2−

V

A

2.3
kΩ

2.3 kΩ

mute
switch

V

A

2.3

(1)

kΩ

(9×)
C

M

2.3 kΩ
(9×)

PGND2 PGND1

OUT2+

OUT2−

mgu358

(1) Pin HEATTAB is available in TDA8566TH1 only.

Fig 1. Block diagram

TDA8566_6 © NXP B.V. 2007. All rights reserved.

Product data sheet Rev. 06 — 15 October 2007 3 of 21

NXP Semiconductors

6. Pinning information

6.1 Pinning

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier

24
23

V

P2

22

n.c. IN2−

21

OUT2− n.c.

20

PGND2 n.c.

19

OUT2+ n.c.

18

OUT1− MODE

17

PGND1 n.c.

16

OUT1+ n.c.

15

n.c. IN1+

14

V

P1

13

CLIP SGND

TDA8566TH1

001aah015

20

MODE DIAG

19

V

P2

18

OUT2− IN2−

17

PGND2 n.c.

16

OUT2+ n.c.

15

OUT1− n.c.

14

PGND1 n.c.

13

OUT1+ IN1+

12

V

P1

11

CLIP SGND

TDA8566TH

001aag902

1
2

IN2+
3
4
5
6
7
8
9

IN1−

10

HEATTAB DIAG

Fig 2. Pin configuration TDA8566TH Fig 3. Pin configuration TDA8566TH1

1

IN1+

2

IN1−

3

SGND

4

CLIP

5

V

P1

n.c.

V

MODE

DIAG

IN2+
IN2−

6
7
8

9
10
11
12
13

P2

14
15
16
17

TDA8566Q

OUT1+

PGND1

OUT1−

OUT2+

PGND2

OUT2−

1
2

IN2+
3
4
5
6
7
8
9

10
11

IN1−

12

001aah059

Fig 4. Pin configuration TDA8566Q

TDA8566_6 © NXP B.V. 2007. All rights reserved.

Product data sheet Rev. 06 — 15 October 2007 4 of 21

NXP Semiconductors

6.2 Pin description

Table 3. Pin description TDA8566TH and TDA8566TH1

Symbol Pin Description

DIAG 1 1 short-circuit and temperature pre-warning

IN2+ 2 2 channel 2 input positive
IN2− 3 3 channel 2 input negative
n.c. 4 4 not connected
n.c. 5 5 not connected
n.c. 6 6 not connected
n.c. 7 - not connected
n.c. - 8 not connected
n.c. - 9 not connected
IN1+ 8 10 channel 1 input positive
IN1− 9 11 channel 1 input negative
SGND 10 12 signal ground
CLIP 11 13 clip detection output
V

P1

n.c. - 15 not connected
OUT1+ 13 16 channel 1 output positive
PGND1 14 17 power ground 1
OUT1− 15 18 channel 1 output negative
n.c. - - not connected
OUT2+ 16 19 channel 2 output positive
PGND2 17 20 power ground 2
OUT2− 18 21 channel 2 output negative
n.c. - 22 not connected
V

P2

MODE 20 7 mode select switch input (standby/mute/operating)
HEATTAB - 24 connect to ground, used for test purposes only

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier

TDA8566TH TDA8566TH1

diagnostic output

12 14 supply voltage 1

19 23 supply voltage 2

Table 4. Pin description TDA8566Q

Symbol Pin Description

IN1+ 1 channel 1 input positive
IN1− 2 channel 1 input negative
SGND 3 signal ground
CLIP 4 clip detection output
V

P1

OUT1+ 6 channel 1 output positive
PGND1 7 power ground 1
OUT1− 8 channel 1 output negative
n.c. 9 not connected

TDA8566_6 © NXP B.V. 2007. All rights reserved.

Product data sheet Rev. 06 — 15 October 2007 5 of 21

5 supply voltage 1

NXP Semiconductors

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier

Table 4. Pin description TDA8566Q

Symbol Pin Description

OUT2+ 10 channel 2 output positive
PGND2 11 power ground 2
OUT2− 12 channel 2 output negative
V

P2

MODE 14 mode select switch input (standby/mute/operating)
DIAG 15 short-circuit and temperature pre-warning diagnostic output
IN2+ 16 channel 2 input positive
IN2− 17 channel 2 input negative

13 supply voltage 2

7. Functional description

The TDA8566 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:

• Mode select switch

• Clip detection

• Short-circuit diagnostic

• Temperature pre-warning

• Open-collector diagnostic outputs

• Differential inputs

…continued

7.1 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, it is advisable to keep the amplifier 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 Figure 8.

7.2 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 Figure 5.

TDA8566_6 © NXP B.V. 2007. All rights reserved.

Product data sheet Rev. 06 — 15 October 2007 6 of 21

NXP Semiconductors

V

TDA8566

2 × 40 W/2 Ω stereo BTL car radio power amplifier

V

O

(V)

0

CLIP

(V)

0

t (s)

mgu357

Fig 5. Clip detection waveforms

7.3 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 Figure 6. The power dissipation in any short-circuit condition is very low.

current

in

output

stage

t (s)

t (s)

mgu360

V

DIAG

(V)

short-circuit over the load

20 ms

50 µs

Fig 6. Short-circuit diagnostic timing diagram

7.4 Temperature pre-warning (pin DIAG)

When the virtual junction temperature (Tvj) reaches 145 °C, pin DIAG will become
continuously LOW.

7.5 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.

TDA8566_6 © NXP B.V. 2007. All rights reserved.

Product data sheet Rev. 06 — 15 October 2007 7 of 21