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TDA8567Q
4 x 25 W BTL quad car radio power amplifier
Philips Semiconductors Product specification×
25 W BTL quad car radio power
amplifier TDA8567Q
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, except for the gain.
GENERAL DESCRIPTIONThe TDA8567Q is an integrated class-B output amplifier in
a 23-lead Single-In-Line (SIL) plastic power package.
It contains four amplifiers in BTL configuration, each with a
gain of 26 dB. The output power is 4×25 W in a 4 Ω load.
APPLICATIONS The device is primarily developed for car radio
applications.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
BLOCK DIAGRAM
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
PINNING
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
FUNCTIONAL DESCRIPTIONThe TDA8567Q contains four identical amplifiers which
can be used for bridge applications. The gain of each
amplifier is fixed at 26 dB.
Mode select switch (pin 15) Standby: low supply current (<100 μA) Mute: input signal suppressed Operating: normal on condition.
Since this pin has a low input current (<80 μA), a low cost
supply switch can be applied.
To avoid switch-on plops, it is advised to keep the amplifier
in the mute mode during ≥150 ms (charging of the input
capacitors at pins 10, 11, 13 and 14). When switching
from standby to mute, the slope should be at least 18 V/s.
This can be realized by: Microprocessor control External timing circuit (see Fig.3).
Diagnostic output (pin9)DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin9
goes LOW. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and so limit the distortion. The output level of pin9
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
device is switched on again, with a delay of approximately ms after removal of the short-circuit. During this
short-circuit condition, pin 9 is continuously LOW.
When a short-circuit occurs across the load of one or more
channels, the output stages are switched off during
approximately 10 ms. After that time it is checked during
approximately 50 μs to 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 9 is LOW for 10 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, all channels areswitched off. Consequently, the power dissipation in any
short-circuit condition is very low.
TEMPERATURE PRE-WARNING
When the virtual junction temperature Tvj reaches 145 °C,
pin 9 goes LOW.
OPEN COLLECTOR OUTPUTS
The diagnostic pin has an open collector output, so more
devices can be tied together. An external pull-up resistor is
needed.
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
QUALITY SPECIFICATIONIn accordance with “SNW-FQ-611E”. The number of the quality specification can be found in the “Quality Reference
Handbook”. The handbook can be ordered using the code 9397 750 00192.
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
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× 25 W BTL quad car radio power
amplifier TDA8567Q CHARACTERISTICS= 14.4 V; RL =4 Ω; f=1 kHz; Tamb =25 °C; measured in Fig.7; unless otherwise specified.
Notes Frequency response externally fixed. Vripple =Vripple(max)=2V (p-p); Rs =0Ω. B=20 Hzto20 kHz; Rs =0Ω. B=20 Hzto20 kHz; Rs =10kΩ. B=20 Hzto20 kHz; independent of Rs. PO=16 W; Rs =10kΩ. Vi =Vi(max)=1V (RMS). Dynamic Distortion Detector (DDD) active, pin 9 is set to logic0.
Philips Semiconductors Product specification× 25 W BTL quad car radio power
amplifier TDA8567Q
TEST AND APPLICATION INFORMATION
