Philips Semiconductors
Product specification
4
×
40 W BTL quad car radio
power amplifier
FEATURES
•
Capable of driving 2
Ω
loads
•
Requires very few external components
•
High output power
•
Low output offset voltage
•
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 safe to ground, to V
P
and across the load
•
Low power dissipation in any short-circuit condition
•
Thermally protected
•
Reverse polarity safe
QUICK REFERENCE DATA
SYMBOL
V
P
I
ORM
I
q(tot)
I
stb
I
sw
Z
i
P
o
SVRR
α
cs
G
v
V
n(o)
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
closed loop voltage gain
noise output voltage
R
s
= 0
Ω
THD = 10%
R
s
= 0
Ω
R
s
= 10 kΩ
CONDITIONS
MIN.
6
−
−
−
−
25
−
−
−
25
−
GENERAL DESCRIPTION
•
Electrostatic discharge protection
•
No switch-on/switch-off plop
•
Flexible leads
•
Low thermal resistance
•
Pin compatible with the TDA8567Q.
TDA8569Q
The TDA8569Q is an integrated class-B output amplifier in
a 23-lead Single-In-Line (SIL) plastic power package.
It contains four amplifiers in Bridge-Tied Load (BTL)
configuration, each with a gain of 26 dB. The output power
is 4
×
40 W in a 2
Ω
load.
APPLICATIONS
•
The device is developed primarily for car radio
applications.
TYP.
14.4
−
230
0.2
−
30
40
60
55
26
−
MAX.
18
7.5
−
10
80
−
−
−
−
27
120
UNIT
V
A
mA
µA
µA
kΩ
W
dB
dB
dB
µV
ORDERING INFORMATION
TYPE
NUMBER
TDA8569Q
PACKAGE
NAME
DBS23P
DESCRIPTION
plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm)
VERSION
SOT411-1
2003 Aug 08
2
Philips Semiconductors
Product specification
4
×
40 W BTL quad car radio
power amplifier
FUNCTIONAL DESCRIPTION
The TDA8569Q contains four identical amplifiers which
can be used for bridge applications. The gain of each
amplifier is fixed at 26 dB.
Mode select switch (pin MODE)
•
Standby: low supply current (<100
µA)
•
Mute: input signal suppressed
•
Operating: normal on condition.
Since this pin has a low input current (<80
µA),
a low cost
supply switch can be applied.
To avoid switch-on plops, it is advised to keep the amplifier
in the mute mode during
≥150
ms (charging of the input
capacitors at pins IN1, IN2, IN3 and IN4).
This can be realized by:
•
Microprocessor control
•
External timing circuit (see Fig.3).
Diagnostic output (pin V
DIAG
)
D
YNAMIC
D
ISTORTION
D
ETECTOR
(DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin V
DIAG
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 distortion. The output level of
pin V
DIAG
is independent of the number of channels that
are clipping (see Fig.4).
S
HORT
-
CIRCUIT DIAGNOSTIC
TDA8569Q
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
10 ms after removal of the short-circuit. During this
short-circuit condition, pin V
DIAG
is continuously LOW.
When a short-circuit occurs across the load of one or more
channels, the output stages are switched off for
approximately 10 ms. After that time it is checked during
approximately 50
µs
to determine whether the short-circuit
is still present. Due to this duty cycle of 50
µs/10
ms the
average current consumption during this short-circuit
condition is very low.
During this short-circuit condition, pin V
DIAG
is LOW for
10 ms and HIGH for 50
µs
(see Fig.5). The protection
circuits of all channels are coupled. This means that if a
short-circuit condition occurs in
one
of the channels,
all
channels are switched off. Consequently, the power
dissipation in any short-circuit condition is very low.
T
EMPERATURE PRE
-
WARNING
When the virtual junction temperature T
vj
reaches 145
°C,
pin V
DIAG
goes LOW.
O
PEN COLLECTOR OUTPUTS
The diagnostic pin has an open-collector output, so more
devices can be tied together. An external pull-up resistor is
needed.
handbook, halfpage
VP
handbook, halfpage
Vo
MCE461
10 kΩ
100
Ω
0
47
µF
mode
select
switch
100 kΩ
VDIAG
VP
0
MGA708
t
Fig.3 Mode select switch circuitry.
Fig.4 Distortion detector waveform.
2003 Aug 08
5
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