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TDA8566Q
2 x 40 W/2 Ohm stereo BTL car radio power amplifier with differential inputs and diagnostic outputs
Philips Semiconductors Product specification
2 x 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs TDA8566Q
FEATURES Differential inputs Very high Common Mode Rejection Ratio (CMRR) High common mode input signal handling Requires very few external components High output power4 and2 Ω load driving capability Low offset voltage at output 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 proof to ground, to VP and across the load Low power dissipation in any short-circuit condition Thermally protected Reverse polarity safe Protected against electrostatic discharge No switch-on/switch-off plop Flexible leads Low thermal resistance.
GENERAL DESCRIPTIONThe TDA8566Q is an integrated class-B output amplifier
contained in a 17-lead single-in-line (SIL; bent to DIL)
plastic power package. The device contains2 amplifiersin Bridge-Tied Load configuration (BTL). The output power2×25 Wina4Ω loador2×40Wina2Ω load.It has
a differential input stage and 2 diagnostic outputs. The
device is primarily developed for car radio applications.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification
2 x 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs TDA8566Q
BLOCK DIAGRAM
Philips Semiconductors Product specification
2x40W/2Ω stereo BTL car radio power amplifier with
differential inputs and diagnostic outputs TDA8566Q
PINNING
FUNCTIONAL DESCRIPTIONThe TDA8566Q contains2 identical amplifiers and canbe
used for BTL applications. The gain of each amplifier is
fixed at 26 dB. Special features of this device are: Mode select switch Clip detection Short-circuit diagnostic Temperature pre-warning Open-collector outputs Differential inputs.
Mode select switch (pin 14) Standby: low supply current Mute: input signal suppressed Operating: normal on condition.
Since this pin hasa very low input current (<40 μA),a low
cost supply switch can be applied. To avoid switch-on
plops,it isadvisableto keep the amplifierin the mute mode
for a period of ≥150 ms (charging the input capacitors at
pins1,2,16 and 17). This can be realized by
microcontroller controlorbyan external timing circuit (see
Fig.7).
Clip detection (pin4)When clipping occurs at one or more output stages, the
dynamic distortion detector becomes active and pin4
goes LOW. This information canbe usedto drivea sound
processor or a DC volume control to attenuate the input
signal and so limit the level of distortion. The output level pin4is independentof the numberof channels that are
being clipped. The clip detection circuit is disabled in a
short-circuit condition, so if a fault condition occurs at the
outputs, pin 4 will remain at a HIGH level. The clip
detection waveforms are illustrated in Fig.3.
Philips Semiconductors Product specification
2x40W/2Ω stereo BTL car radio power amplifier with
differential inputs and diagnostic outputs TDA8566Q
Short-circuit diagnostic (pin 15)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 the removal of the short-circuit). During this
short-circuit condition, pin 15 is continuously LOW.
Whena short-circuit occurs across the loadof oneor both
channels, the output stages are switched off for
approximately 20 ms. After approximately 50 μs the load
conditionis again checkedto seeif the short-circuitis still
present. Dueto this duty cycleof50 μs/20 ms the average
current consumption during this short-circuit condition is
very low (approximately 40 mA). During this short-circuit
condition, pin 15 is LOW for 20 ms and HIGH for 50μs
(see Fig.4). The power dissipation in any short-circuit
condition is very low.
Temperature pre-warning (pin 15)When the junction temperature (Tvj) reaches 145 °C,
pin 15 will become continuously LOW.
Open-collector outputsPins4 and 15 are open-collector outputs, therefore more
devices can be tied together. Pins4 and 15 can also be
tied together. An external pull-up resistor is required.
Differential inputsThe input stage is a high-impedance fully differential
balanced input stage thatis also capableof operatingina
single-ended mode with one of the inputs capacitively
coupled to an audio ground. It should be noted that if a
source resistance is added (input voltage dividers) the
CMRR degrades to lower values.
Philips Semiconductors Product specification
2 x 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs TDA8566Q
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
QUALITY SPECIFICATIONQuality specification in accordance with “UZW-FQ-611-E”, if this type is used as an audio amplifier. 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.
THERMAL CHARACTERISTICSThermal characteristics in accordance with (IEC 747-1).
Philips Semiconductors Product specification
2 x 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs TDA8566Q
DC CHARACTERISTICS= 14.4 V; Tamb =25 °C; measured in test circuit of Fig.6; unless otherwise specified.
Notes The circuit is DC adjusted at VP=6to18 V and AC operating at VP= 8.5to18V. At VP=18to30 V the DC output voltage ≤0.5 VP.
AC CHARACTERISTICS= 14.4 V; Tamb =25 °C; RL =2 Ω; fi=1 kHz; measured in test circuit of Fig.6; unless otherwise specified.
Philips Semiconductors Product specification
2 x 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs TDA8566Q
Notes Frequency response externally fixed. Vripple =Vripple(max)=2V (p-p); Rs =0Ω. Dynamic Distortion Detector (DDD) active; pin 4 is LOW. Common mode rejection ratio measured at the output (over RL) with both inputs tied together;
Vcommon≤ 3.5V (RMS); f= 100Hzto10 kHz; Rs =0Ω. Common mode rejection ratio measured at the output (over RL) with both inputs tied together;
Vcommon≤ 3.5V (RMS); f=1 kHz; Rs =45kΩ. The mismatch of the input coupling capacitors is excluded.
