DATA SHEET
Product specification
File under Integrated Circuits, IC01
May 1992
INTEGRATED CIRCUITS
TDA1557Q
2 x 22 W BTL stereo car radio
power amplifier with speaker
protection
May 1992
2
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
FEATURES
Requires very few external components
High output power
Low offset voltage at output
Fixed gain
Good ripple rejection
Mute/stand-by switch
Load dump protection
AC and DC short-circuit-safe to ground and V
P
Thermally protected
Reverse polarity safe
Capability to handle high energy on outputs (V
P
= 0)
Protected against electrostatic discharge
No switch-on/switch-off plop
Flexible leads
Low thermal resistance.
GENERAL DESCRIPTION
The TDA1557Q is a monolithic integrated class-B output
amplifier in a 13-lead single-in-line (SIL) plastic power
package. The device contains 2
22 W amplifiers in BTL
configuration and has been primarily developed for car
radio applications.
QUICK REFERENCE DATA
ORDERING INFORMATION
Note
1. SOT141-6; 1996 August 23.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P
positive supply voltage range
operating
6.0
14.4
18
V
non-operating
-
-
30
V
load dump
-
-
45
V
IORM
repetitive peak output current
-
-
4
A
I
tot
total quiescent current
-
80
-
mA
I
sb
stand-by current
-
0.1
100
A
I
sw
switch-on current
-
-
60
A
Z
I
input impedance
25
-
-
k
T
XTAL
crystal temperature
-
-
+
150
C
Stereo application
P
O
output power
THD = 10%; 4
-
22
-
W
SVRR
supply voltage ripple rejection
R
S
= 0; f = 100 Hz to 10 kHz
45
-
-
dB
V
O
DC output offset voltage
-
-
250
mV
channel separation
40
-
-
dB
G
v
channel unbalance
-
-
1
dB
G
v
closed loop voltage gain
45
46
47
dB
EXTENDED TYPE
NUMBER
PACKAGE
PINS
PIN POSITION
MATERIAL
CODE
TDA1557Q
13
DIL
plastic
SOT141R
May 1992
3
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
Fig.1 Block diagram.
handbook, full pagewidth
mute/stand-by
MCD324 - 1
x1
stand-by
switch
11
power ground
5
8
signal ground
output 1A
3
10
mute switch
VA
mute switch
VA
4
6
output 1B
input 1
1
TDA1557Q
output 2B
mute switch
VA
mute switch
VA
9
7
output 2A
input 2
13
18.1 k
CM
POWER
STAGE
18.1 k
2
input
reference
voltage
CM
POWER
STAGE
183
183
30 k
loudspeaker
protection
mute
switch
stand-by
reference
voltage
mute
reference
voltage
18.1 k
CM
POWER
STAGE
18.1 k
CM
POWER
STAGE
183
183
30 k
12
VA
15 k
15 k
VP
input
reference
voltage
V
P
May 1992
4
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
PINNING
SYMBOL
PIN
DESCRIPTION
INP1
1
input 1
GND1
2
ground (signal)
V
P1
3
supply voltage 1
OUT1A
4
output 1A
GND
5
power ground 1
OUT1B
6
output 1B
OUT2A
7
output 2A
GND
8
power ground 2
OUT2B
9
output 2B
V
P2
10
supply voltage 2
M/SS
11
mute/stand-by switch
V
ref
12
input reference voltage
INP2
13
input 2
Fig.2 Pin configuration.
handbook, halfpage
MCD322 - 1
1
2
3
4
5
6
7
8
9
10
11
12
13
TDA1557Q
INP1
GND1
P1
V
OUT1A
GND
OUT1B
OUT2A
OUT2B
INP2
GND
M / SS
ref
V
P2
V
FUNCTIONAL DESCRIPTION
The TDA1557Q contains two identical amplifiers with
differential input stages, and can be used for bridge
applications. The gain of each amplifier is fixed at 46 dB.
Special features of this device are:
a. mute/stand-by switch
low stand-by current
low mute/stand-by switching current (low cost supply
switch)
mute facility
b. loudspeaker protection
when a short circuit to ground is made, which forces a
DC voltage of
1 V across the loudspeaker, a built-in
protection circuit becomes active and limits the DC
voltage across the loudspeaker to
1 V
c. the harmonic distortion at low frequencies can be
decreased by connecting two diodes to ground at pin 12.
May 1992
5
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
LIMITING VALUES
In accordance with the Absolute maximum System (IEC 134).
THERMAL RESISTANCE
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P
positive supply voltage
operating
-
18
V
non-operating
-
30
V
load dump protected; during
-
45
V
50 ms; rise time
2.5 ms
V
PSC
AC and DC short-circuit safe voltage
-
18
V
V
PR
reverse polarity
-
6.0
V
energy handling capability at outputs
V
P
= 0
-
200
mJ
IOSM
non-repetitive peak output current
-
6
A
IORM
repetitive peak output current
-
4
A
P
tot
total power dissipation
-
60
W
T
stg
storage temperature range
-
55
+
150
C
T
j
junction temperature
-
+
150
C
SYMBOL
PARAMETER
THERMAL RESISTANCE
R
th vj-a
from virtual junction to ambient in free air
40 K/W
R
th vj-c
from virtual junction to case (see Fig.3)
1.5 K/W
Fig.3 Equivalent thermal resistance network.
handbook, halfpage
2.8
K/W
0.1
K/W
2.8
K/W
virtual
junction
output 1
output 2
case
MLA382
May 1992
6
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
DC CHARACTERISTICS
V
P
= 14.4 V, T
amb
= 25
C, unless otherwise specified. See note 1.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
V
P
positive supply voltage range
note 2
6.0
14.4
18
V
I
P
quiescent current
-
80
160
mA
V
O
DC output voltage
note 3
-
6.9
-
V
V
os
DC output offset voltage
-
-
250
mV
Mute/stand-by switch
V
sw
switch-on voltage level
8.5
-
-
V
M
UTE CONDITION
V
mute
mute voltage
3.3
-
6.4
V
V
O
output signal in mute position
V
I
= 1 V max; f = 1 kHz
-
-
20
mV
V
os
DC output offset voltage
-
-
250
mV
S
TAND
-
BY CONDITION
V
sb
stand-by voltage
0
-
2.0
V
I
sb
DC current in stand-by condition
V
11
0.5 V
-
-
100
A
0.5
<
V
11
2 V
-
-
500
A
I
sw
switch-on current
-
30
60
A
I
P
positive supply current
short-circuit to GND;
-
5.5
-
mA
note 4
Loudspeaker protection
V
4-6, 7-9
DC voltage across R
L
-
-
1.0
V
May 1992
7
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
AC CHARACTERISTICS
V
P
= 14.4 V; R
L
= 4
; f = 1 kHz; T
amb
= 25
C; unless otherwise specified. See note 1.
Notes to the characteristics
1. All characteristics are measured using the circuit shown in Fig.4
2. The circuit is DC adjusted at V
P
= 6 to 18 V and AC operating at V
P
= 8.5 to 18 V
3. At 18 V < V
P
< 30 V, the DC output voltage
V
P
/2
4. Conditions: V
11
= 0; short-circuit output to GND; switch V
11
to MUTE or ON condition (rise time V
11
> 10
s).
5. Frequency response externally fixed.
6. Ripple rejection measured at the output with a source-impedance of 0
(max. ripple amplitude of 2 V) and a
frequency of 100 Hz.
7. Ripple rejection measured at the output with a source-impedance of 0
(max. ripple amplitude of 2 V) and a
frequency between 1 and 10 kHz.
8. Ripple rejection measured at the output with a source-impedance of 0
(max. ripple amplitude of 2 V) and a
frequency between 100 Hz and 10 kHz. Pin 12 is decoupled with two diodes to ground.
9. Noise voltage measured in a bandwidth of 20 Hz to 20 kHz.
10. Noise output voltage independent of R
S
(V
in
= 0).
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
P
O
output power
THD = 0.5%
15
17
-
W
THD = 10%
20
22
-
W
V
P
= 13.2 V; THD = 0.5%
-
12
-
W
V
P
= 13.2 V; THD = 10%
-
17
-
W
THD
total harmonic distortion
P
O
= 1 W
-
0.1
-
%
B
power bandwidth
THD = 0.5%; P
O
=
-
1 dB
-
20 to
-
Hz
with respect to 15 W
15 000
f
low
low frequency roll-off
-
1 dB; note 5
-
25
-
Hz
f
high
high frequency roll-off
-
1 dB
20
-
-
kHz
G
v
closed loop voltage gain
45
46
47
dB
SVRR
supply voltage ripple rejection
ON; note 6
34
-
-
dB
ON; note 7
38
-
-
dB
ON; note 8
45
-
-
dB
MUTE; notes 6 and 7
45
-
-
dB
stand-by; notes 6 and 7
80
-
-
dB
Z
I
input impedance
25
30
36
k
V
no
noise output voltage
ON; R
S
= 0; note 9
-
325
500
V
R
S
= 10 k
; note 9
-
350
-
V
MUTE; notes 9 & 10
-
180
-
V
channel separation
40
-
-
dB
G
v
channel unbalance
-
-
1
dB
May 1992
8
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
Fig.4 Stereo BTL application.
handbook, full pagewidth
input 1
4
6
R = 4
L
30 k
270 nF
1
input 2
9
7
R = 4
L
30 k
270 nF
13
reference
voltage
100 nF
2200
F
+ V
5
8
power ground (substrate)
ground (signal)
2
12
11
3
10
mute /
stand-by
TDA1557Q
MCD323 - 1
May 1992
9
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
PACKAGE OUTLINE
UNIT
A
e
1
A
2
b
p
c
D
(1)
E
(1)
Z
(1)
d
e
D
h
L
L
3
m
REFERENCES
OUTLINE
VERSION
EUROPEAN
PROJECTION
ISSUE DATE
IEC
JEDEC
EIAJ
mm
17.0
15.5
4.6
4.2
0.75
0.60
0.48
0.38
24.0
23.6
20.0
19.6
10
3.4
v
0.8
12.2
11.8
1.7
e
2
5.08
2.4
1.6
E
h
6
2.00
1.45
2.1
1.8
3.4
3.1
4.3
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
12.4
11.0
SOT141-6
0
5
10 mm
scale
Q
j
0.25
w
0.03
x
D
L
E
A
c
A
2
m
L
3
Q
w
M
b
p
1
d
D
Z
e
2
e
e
x
h
1
13
j
Eh
non-concave
view B: mounting base side
92-11-17
95-03-11
DBS13P: plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm)
SOT141-6
v
M
B
May 1992
10
Philips Semiconductors
Product specification
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
TDA1557Q
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
"IC Package Databook" (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.
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