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TDA8571J
4 x 40 W BTL quad car radio power amplifier
Philips Semiconductors Product specification×
40 W BTL quad car radio power
amplifier TDA8571J
FEATURES 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 and to VP and across the
load Low power dissipation in any short-circuit condition Thermally protected Reverse polarity safe Electrostatic discharge protection No switch-on/switch-off plop Flexible leads Low thermal resistance Pin compatible with the TDA8568Q, exceptfor the gain.
GENERAL DESCRIPTIONThe TDA8571J is a integrated class-B output amplifier
contained in a 23-lead Single-In-Line (SIL) plastic power
package.It contains four amplifiersina BTL configuration,
each with a gain of 34 dB. The output power is 4×40W
(EIAJ) into a 4 Ω load.
APPLICATIONS Primarily developed for car radio applications.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
BLOCK DIAGRAM
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
PINNING
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
FUNCTIONAL DESCRIPTIONTheTDA8571J contains four identical amplifiers which can usedfor bridge applications. The gainof each amplifier
is fixed at 34 dB.
Mode select switch (pin MODE) Standby: low supply current (<100 μA) Mute: input signal suppressed Operating: normal on condition.
Since this pin hasa low input current (<80 μA),a low cost
supply switch can be applied. avoid switch-onplops,itis advisedto keepthe amplifier
in the mute mode during ≥150 ms (charging of the input
capacitors at pins IN1, IN2, IN3 and IN4. When switching
from standbyto mute, the slope shouldbeat least18 V/s.
This can be realized by: Microprocessor control External timing circuit (see Fig.3).
Diagnostic output (pin VDIAG)DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin VDIAG
goes LOW. This information canbe usedto drivea sound
processor or DC volume control to attenuate the input
signal and so limit the distortion. The output level of
pin VDIAG is independent of the number of channels that
are clipping (see Fig.4).
SHORT-CIRCUIT DIAGNOSTIC
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
deviceis switchedon again, witha delayof approximately ms after removal of the short-circuit. During this
short-circuit condition, pin VDIAG is continuously LOW.
Whena short-circuit occurs across the loadof oneor more
channels, the output stages are switched off during
approximately 10 ms. After that time it is checked during
approximately50μsto 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 VDIAG is LOW for 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,allchannels are switched off. Consequently, the power
dissipation in any short-circuit condition is very low.
TEMPERATURE PRE-WARNING
When the virtual junction temperatureTvj reaches 145 °C,
pin VDIAG goes LOW.
OPEN-COLLECTOR OUTPUTS
The diagnostic pin has an open-collector output, so more
devices canbe tied together.An external pull-up resistoris
needed.
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 60134).
THERMAL CHARACTERISTICS
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
QUALITY SPECIFICATIONIn accordance with “General Quality Specification For Integrated Circuits (SNW-FQ-611D)”.
CHARACTERISTICS= 14.4 V; Tamb =25 °C; measured in Fig.7; unless otherwise specified.
Notes The circuit is DC adjusted at VP=6to18 V and AC operating at VP= 8.5to18V. At 18V
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J CHARACTERISTICS= 14.4 V; RL =4 Ω; f=1 kHz; Tamb =25 °C; measured in Fig.7; unless otherwise specified.
Notes Dynamic Distortion Detector (DDD) active, pin VDIAG is set to LOW level. Frequency response externally fixed.
Philips Semiconductors Product specification× 40 W BTL quad car radio power
amplifier TDA8571J
TEST AND APPLICATION INFORMATION
