July 1994
5
Philips Semiconductors
Product specification
2 x 22 W stereo BTL differential amplifier
with speaker protection and dynamic
TDA1556Q
FUNCTIONAL DESCRIPTION
The TDA1556Q contains two identical amplifiers each with
a fixed gain of 26 dB and differential input stages.
The device can be used for bridge-tied-load applications.
The circuit has the following features:
•
low stand-by current (< 100
µ
A)
•
low mute/stand-by switching current (low cost supply
switch)
•
mute facility
Loudspeaker protection
Should a short circuit to ground occur, thereby forcing a
DC voltage
≥
1 V across the loudspeaker, a built-in
protection circuit is activated to limit the DC voltage across
the speaker to
≤
1 V. The delay time of the protection
circuit can be influenced by the external capacitor
connected to pin 15.
A dynamic distortion detector (DDD) is activated when
clipping occurs at one or both output stages. Its
information may be used to operate a sound processor or
DC volume control to attenuate the input signal, thereby
minimizing the distortion.
LIMITING VALUES
In accordance with the absolute maximum system (IEC 134)
DC CHARACTERISTICS
V
P
= 14.4 V; T
amb
= 25
°
C; unless otherwise specified
SYMBOL
PARAMETER
CONDITION
MIN.
MAX.
UNIT
V
P
positive supply voltage
operating
−
18
V
non-operating
−
30
V
during 50 ms (load
dump protection);
rise time
≥
2.5 ms
−
45
V
I
OSM
non-repetitive peak output current
−
6
A
I
ORM
repetitive peak output current
−
4
A
T
stg
storage temperature range
−
55
+150
°
C
T
vj
virtual junction temperature
−
+150
°
C
V
psc
AC and DC short-circuit safe voltage
−
18
V
energy handling capability at outputs
V
P
= 0
−
200
mJ
V
pr
reverse polarity
−
6
V
P
tot
total power dissipation
−
60
W
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
V
P
positive supply voltage
note 1
6.0
14.4
18
V
I
P
quiescent current
−
80
160
mA
V
O
DC output voltage
note 2
−
6.9
−
V
V
os
DC output offset voltage
operating
−
−
100
mV
Mute/stand-by
V
ON
switch-on voltage level
8.5
−
−
V
