tda1561q.pdf

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2 x 23 W high efficiency car radio power amplifier
INTEGRATED CIRCUITS
DATA SHEET
23 W high efficiency car radio
power amplifier
Preliminary specification
Supersedes data of 1997 Jun 11
File under Integrated Circuits, IC01
1997 Aug 14
TDA1561Q
2
´
199643281.039.png
Philips Semiconductors
Preliminary specification
23 W high efficiency car radio power
amplifier
´
TDA1561Q
FEATURES
GENERAL DESCRIPTION
·
Low dissipation due to switching from Single-Ended
(SE) to Bridge-Tied Load (BTL) mode
The TDA1561Q is a monolithic power amplifier in a 13 lead
single-in-line (SIL) plastic power package. It contains two
identical 23 W amplifiers. The dissipation is minimized by
switching from SE to BTL mode, only when a higher output
voltage swing is needed. The device is primarily
developed for car radio applications.
·
High Common Mode Rejection Ratio (CMRR)
·
Mute/standby/operating/SE-only (mode select pin)
·
Zero crossing mute and standby circuit
·
Load dump protection circuit
·
Short-circuit safe to ground, to supply voltage and
across load
·
Loudspeaker protection circuit
·
Device switches to single-ended operation at excessive
junction temperatures.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
V P
supply voltage
DC biased
6.0
14.4
18
V
non operating
-
-
30
V
load dump
-
-
50
V
I ORM
repetitive peak output current
-
-
4
A
I q(tot)
total quiescent current
R L =
¥
-
95
150
mA
I stb
standby current
-
1
50
m
A
ï
Z i ï
input impedance
-
60
-
k
W
P o
output power
RL = 4 W ; EIAJ
-
36
-
W
THD 10%
21
23
-
W
G v
voltage gain
31
32
33
dB
CMRR
common mode rejection ratio
f = 1 kHz; R s =0
W
-
80
-
dB
SVRR
supply voltage ripple rejection
f = 1 kHz; R s =0 W
45
55
-
dB
ïD
V O ï
DC output offset voltage
-
-
150
mV
a cs
channel separation
R s =0k
W
40
60
-
dB
ïD
G v ï
channel unbalance
-
-
1
dB
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA1561Q
DBS13P
plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm)
SOT141-6
1997 Aug 14
2
2
199643281.040.png
Philips Semiconductors
Preliminary specification
23 W high efficiency car radio power
amplifier
´
TDA1561Q
BLOCK DIAGRAM
handbook, full pagewidth
V P
7
MUTE
1
6
IN1
OUT1
5
R
OUT1
12
REFERENCE
SOURCES
MUTE/STANDBY
THERMAL/
SHORT-CIRCUIT
PROTECTION
HIGHER
TEMPERATURE
BTL DISABLE
CIN
1/2R
0.5V P
11
C
11
MODE
3
9
HV
2
OUT2
P
R
8
13
OUT2
IN2
TDA1561Q
MUTE
4
10
GND1
GND2
MLD214
Fig.1 Block diagram.
1997 Aug 14
3
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Philips Semiconductors
Preliminary specification
23 W high efficiency car radio power
amplifier
´
TDA1561Q
PINNING
SYMBOL
PIN
DESCRIPTION
IN1
1
input 1
HV P
2
half supply voltage control input
handbook, halfpage
IN1
1
MODE
3
mute/standby/operating/SE-only
HV
2
P
GND1
4
ground 1
MODE
3
OUT1
5
inverting output 1
OUT1
6
non-inverting output 1
GND1
4
V P
7
supply voltage
OUT1
5
OUT2
8
inverting output 2
OUT1
6
OUT2
9
non-inverting output 2
V
P
7
TDA1561Q
GND2
10
ground 2
OUT2
8
C 11
11
electrolytic capacitor for
single-ended (SE) mode
OUT2
9
CIN
12
common input
GND2
10
IN2
13
input 2
C
11
11
CIN
12
IN2
13
MLD215
Fig.2 Pin configuration.
1997 Aug 14
4
2
199643281.022.png 199643281.023.png 199643281.024.png 199643281.025.png 199643281.026.png 199643281.027.png 199643281.028.png 199643281.029.png 199643281.030.png 199643281.031.png 199643281.032.png 199643281.033.png 199643281.034.png 199643281.035.png 199643281.036.png 199643281.037.png
Philips Semiconductors
Preliminary specification
23 W high efficiency car radio power
amplifier
´
TDA1561Q
FUNCTIONAL DESCRIPTION
The device is fully protected against short-circuiting of the
output pins to ground and to the supply voltage. It is also
protected against short-circuiting the loudspeaker and
high junction temperatures. In the event of a permanent
short-circuit condition to ground or the supply voltage, the
output stage will be switched off causing a low dissipation.
With permanent short-circuiting of the loudspeaker, the
output stage will be repeatedly switched on and off.
The duty cycle in the ‘on’ condition is low enough to
prevent excessive dissipation.
To avoid plops during switching from ‘mute’ to ‘on’ or from
‘on’ to ‘mute/standby’ while an input signal is present, a
built-in zero-crossing detector allows only switching at
zero input voltage. However, when the supply voltage
drops below 6 V (e.g. engine start), the circuit mutes
immediately avoiding clicks coming from electronic
circuitry preceding the power amplifier.
The TDA1561Q contains two identical amplifiers with
differential inputs. At low output power (up to output
amplitudes of 3 V (RMS) at V P = 14.4 V), the device
operates as a normal SE amplifier. When a larger output
voltage swing is needed, the circuit switches internally to
BTL operation.
With a sine wave input signal the dissipation of a
conventional BTL amplifier up to 2 W output power is more
than twice the dissipation of the TDA1561Q (see Fig.9).
In normal use, when the amplifier is driven with music-like
signals, the high (BTL) output power is only needed for a
small percentage of time. Under the assumption that a
music signal has a normal (Gaussian) amplitude
distribution, the dissipation of a conventional BTL amplifier
with the same output power is approximately 70% higher
(see Fig.10).
The heatsink has to be designed for use with music
signals. With such a heatsink, the thermal protection will
disable the BTL mode when the junction temperature
exceeds 145 ° C. In this case the output power is limited to
5 W per amplifier.
The voltage of the SE electrolytic capacitor (pin 11) is
always kept at 0.5V P by means of a voltage buffer (see
Fig.1). The value of this capacitor has an important
influence on the output power in SE mode, especially at
low signal frequencies, a high value is recommended to
minimize dissipation at low frequencies.
The gain of each amplifier is internally fixed at 32 dB. With
the MODE pin, the device can be switched to the following
modes:
·
Standby with low standby current (<50
m
A)
·
Mute condition, DC adjusted
·
On, operation
·
SE-only, operation (BTL disabled).
1997 Aug 14
5
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