July 1994 5
Philips Semiconductors Product specification
2 x 22 W stereo BTL differential amplifier
with speaker protection and dynamic TDA1556QFUNCTIONAL 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 µA)
•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
VP = 14.4 V; Tamb = 25°C; unless otherwise specified
SYMBOL PARAMETER CONDITION MIN. MAX. UNIT
VPpositive supply voltage
operating −18 V
non-operating −30 V
during 50 ms (load
dump protection);
rise time ≥2.5 ms
−45 V
IOSM non-repetitive peak output current −6A
I
ORM repetitive peak output current −4A
T
stg storage temperature range −55 +150 °C
Tvj virtual junction temperature −+150 °C
Vpsc AC and DC short-circuit safe voltage −18 V
energy handling capability at outputs VP = 0 −200 mJ
Vpr reverse polarity −6V
P
tot total power dissipation −60 W
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Supply
VPpositive supply voltage note 1 6.0 14.4 18 V
IPquiescent current −80 160 mA
VODC output voltage note 2 −6.9 −V
Vos DC output offset voltage operating −−100 mV
Mute/stand-by
VON switch-on voltage level 8.5 −−V