INTEGRATED CIRCUITS
DATA SHEET
TDA8566Q
2
×
40 W/2
Ω
stereo BTL car radio
power amplifier with differential
inputs and diagnostic outputs
Product specification
Supersedes data of 1998 Sep 23
File under Integrated Circuits, IC01
2000 Jan 28
Philips Semiconductors
Product 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 V
P
and across the load
QUICK REFERENCE DATA
SYMBOL
V
P
I
ORM
I
q(tot)
I
stb
I
sw
Z
i
P
out
SVRR
α
cs
CMRR
G
v
V
no
V
os
PARAMETER
operating supply voltage
repetitive peak output current
total quiescent current
standby current
switch-on current
input impedance
output power
supply voltage ripple rejection
channel separation
common mode rejection ratio
closed loop voltage gain
noise output voltage
DC output offset voltage
R
s
= 0
Ω
R
L
= 4
Ω;
THD = 10%
R
L
= 2
Ω;
THD = 10%
R
s
= 0
Ω
R
s
= 10 kΩ
CONDITIONS
MIN.
6
−
−
−
−
100
−
−
−
−
−
25
−
−
GENERAL DESCRIPTION
•
Thermally protected
•
Reverse polarity safe
TDA8566Q
•
Low power dissipation in any short-circuit condition
•
Protected against electrostatic discharge
•
No switch-on/switch-off plop
•
Flexible leads
•
Low thermal resistance.
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 2 amplifiers in
a Bridge-Tied Load configuration (BTL). 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.
TYP.
14.4
−
115
0.1
−
120
25
40
60
50
75
26
−
−
MAX.
18
7.5
−
100
40
−
−
−
−
−
−
27
120
100
UNIT
V
A
mA
µA
µA
kΩ
W
W
dB
dB
dB
dB
µV
mV
ORDERING INFORMATION
TYPE
NUMBER
TDA8566Q
PACKAGE
NAME
DBS17P
DESCRIPTION
plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm)
VERSION
SOT243-1
2000 Jan 28
2
Philips Semiconductors
Product specification
2
×
40 W/2
Ω
stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
BLOCK DIAGRAM
VP1
handbook, full pagewidth
TDA8566Q
VP2
13
IN1+
1
+
2
−
mute
switch
5
CM
IN1−
6
2.3
kΩ
+
−
2.3 kΩ
mute
switch
(9×)
CM
VA
OUT1+
+
−
8
60
kΩ
60
kΩ
2.3
kΩ
+
−
2.3 kΩ
(9×)
n.c.
9
standby
switch
14
VA
OUT1−
MODE
TDA8566Q
Vref
SGND
3
1×
DIAG
mute
reference
voltage
+
17
−
10
2.3
kΩ
+
−
2.3 kΩ
mute
switch
(9×)
CM
VA
OUT2+
mute
switch
15
DIAG
VA
standby
reference
voltage
mute
switch
CLIP
4
CLIP
60
kΩ
IN2+
16
60
kΩ
CM
IN2−
+
−
12
2.3
kΩ
+
−
2.3 kΩ
11
7
(9×)
MGD105
VA
OUT2−
PGND2
PGND1
Fig.1 Block diagram.
2000 Jan 28
3
Philips Semiconductors
Product specification
2
×
40 W/2
Ω
stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
PINNING
SYMBOL
IN1+
IN1−
SGND
CLIP
V
P1
OUT1+
PGND1
OUT1−
n.c.
OUT2+
PGND2
OUT2−
V
P2
MODE
DIAG
IN2+
IN2−
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DESCRIPTION
channel 1 input positive
channel 1 input negative
small signal ground
clip detection
supply voltage 1
channel 1 speaker output positive
channel 1 negative power supply
(ground)
channel 1 speaker output negative
not connected
channel 2 speaker output positive
channel 2 negative power supply
(ground)
channel 2 speaker output negative
supply voltage 2
mode select switch
(standby/mute/operating)
short-circuit and temperature
pre-warning diagnostic
channel 2 input positive
channel 2 input negative
MGD101
TDA8566Q
handbook, halfpage
IN1+
IN1−
SGND
CLIP
VP1
OUT1+
PGND1
OUT1−
n.c.
1
2
3
4
5
6
7
8
9
TDA8566Q
OUT2+ 10
PGND2 11
OUT2− 12
VP2 13
MODE 14
DIAG 15
IN2+ 16
IN2− 17
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
The TDA8566Q 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 outputs
6. Differential inputs.
Mode select switch (pin 14)
•
Standby: low supply current (<100
µA)
•
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 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 a 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.
2000 Jan 28
4
Philips Semiconductors
Product specification
2
×
40 W/2
Ω
stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
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
µs
the load
condition is again checked to see if the short-circuit is still
present. Due to this duty cycle of 50
µs/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
µs
(see Fig.4). The power dissipation in any short-circuit
condition is very low.
Temperature pre-warning (pin 15)
TDA8566Q
When the junction temperature (T
vj
) reaches 145
°C,
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.
handbook, halfpage
out
V
MGD103
0
V4
VP
0
t
Fig.3 Clip detection waveforms.
handbook, full pagewidth
current
in
output
stage
MGA707
V15
VP
short-circuit over the load
20 ms
t
t
50
µs
Fig.4 Short-circuit diagnostic timing diagram.
2000 Jan 28
5
