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TDA7566
MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES
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TDA7566September 2003 DMOS POWER OUTPUT HIGH OUTPUT POWER CAPABILITY 4x25W/
4Ω @ 14.4V, 1KHZ, 10% THD, 4x35W EIAJ MAX. OUTPUT POWER 4x60W/2W FULL I2C BUS DRIVING:- ST-BY-
INDEPENDENT FRONT/REAR SOFT PLAY/
MUTE- SELECTABLE GAIN 26dB - 12dB- I2C
BUS DIGITAL DIAGNOSTICS FULL FAULT PROTECTION DC OFFSET DETECTION FOUR INDEPENDENT SHORT CIRCUIT
PROTECTION CLIPPING DETECTOR (1%/10%) ESD PROTECTION
DESCRIPTIONThe TDA7566 is a new BCD technology QUAD
BRIDGE type of car radio amplifier in Flexiwatt25
package specially intended for car radio applications.
Thanks to the DMOS output stage the TDA7566 has
a very low distortion allowing a clear powerful sound.
This device is equipped with a full diagnostics array
that communicates the status of each speaker
through the I2 C bus.
The possibility to control the configuration and be-
haviour of the device by means of the I2 C bus makes
TDA7566 a very flexible machine.
MULTIFUNCTION QUAD POWER AMPLIFIER
WITH BUILT-IN DIAGNOSTICS FEATURES
BLOCK DIAGRAM
TDA7566 2/19
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTION (top view)
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TDA7566
Figure 1. Test and Application Circuit
TDA7566 4/19
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; GV = 26dB; Tamb = 25°C; unless otherwise specified.)
5/19
TDA7566
ELECTRICAL CHARACTERISTICS (continued)(Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; GV = 26dB; Tamb = 25°C; unless otherwise specified.)
TDA7566 6/19
Figure 2. Quiescent Current vs. Supply Voltage
Figure 3. Output Power vs. Supply Voltage (4Ω)
Figure 4. Output Power vs. Supply Voltage (2Ω)
Figure 5. Distortion vs. Output Power (4Ω)
Figure 6. Distortion vs. Output Power (2Ω)
Figure 7. Distortion vs. Frequency (4Ω)
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TDA7566
Figure 8. Distortion vs. Frequency (2W)
Figure 9. Crosstalk vs. Frequency
Figure 10. Supply Voltage Rejection vs. Freq.
Figure 11. Power Dissipation & Efficiency vs.
Figure 12. Power Dissipation vs. Average Ouput
Power (Audio Program Simulation, 4Ω)
Figure 13. Power Dissipation vs. Average Ouput
Power (Audio Program Simulation, 2Ω)
TDA7566 8/19
DIAGNOSTICS FUNCTIONAL DESCRIPTION:
a) TURN-ON DIAGNOSTIC.It is activated at the turn-on (stand-by out) under I2Cbus request. Detectable output faults are:
- SHORT TO GND
- SHORT TO Vs
- SHORT ACROSS THE SPEAKER
- OPEN SPEAKER
To verify if any of the above misconnections are in place, a subsonic (inaudible) current pulse (fig. 14) is inter-
nally generated, sent through the speaker(s) and sunk back.The Turn On diagnostic status is internally stored
until a successive diagnostic pulse is requested (after a I2 C reading).
If the "stand-by out" and "diag. enable" commands are both given through a single programming step, the pulse
takes place first (power stage still in stand-by mode, low, outputs = high impedance).
Afterwards, when the Amplifier is biased, the PERMANENT diagnostic takes place. The previous Turn On state
is kept until a short appears at the outputs.
Figure 14. Turn - On diagnostic: working principleFig. 15 and 16 show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and without TURN-ON
DIAGNOSTIC.
Figure 15. SVR and Output behaviour (CASE 1: without turn-on diagnostic)
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TDA7566The information related to the outputs status is read and memorized at the end of the current pulse top. The
acquisition time is 100 ms (typ.). No audible noise is generated in the process. As for SHORT TO GND / Vs the
fault-detection thresholds remain unchanged from 26 dB to 12 dB gain setting. They are as follows:
Concerning SHORT ACROSS THE SPEAKER / OPEN SPEAKER, the threshold varies from 26 dB to 12 dB
gain setting, since different loads are expected (either normal speaker's impedance or high impedance). The
values in case of 26 dB gain are as follows:
If the Line-Driver mode (Gv= 12 dB and Line Driver Mode diagnostic = 1) is selected, the same thresholds will
change as follows:
TDA7566 10/19
b) PERMANENT DIAGNOSTICS. Detectable conventional faults are:
- SHORT TO GND
- SHORT TO Vs
- SHORT ACROSS THE SPEAKER
The following additional features are provided:
- OUTPUT OFFSET DETECTION
- AC DIAGNOSTIC
The TDA7566 has 2 operating statuses: RESTART mode. The diagnostic is not enabled. Each audio channel operates independently from each
other. If any of the a.m. faults occurs, only the channel(s) interested is shut down. A check of the output
status is made every 1 ms (fig. 17). Restart takes place when the overload is removed. DIAGNOSTIC mode. It is enabled via I2C bus and self activates if an output overload (such to cause
the intervention of the short-circuit protection) occurs to the speakers outputs . Once activated, the di-
agnostics procedure develops as follows (fig. 18): To avoid momentary re-circulation spikes from giving erroneous diagnostics, a check of the output
status is made after 1ms: if normal situation (no overloads) is detected, the diagnostic is not per-
formed and the channel returns back active. Instead, if an overload is detected during the check after 1 ms, then a diagnostic cycle having a du-
ration of about 100 ms is started. After a diagnostic cycle, the audio channel interested by the fault is switched to RESTART mode. The
relevant data are stored inside the device and can be read by the microprocessor. When one cycle
has terminated, the next one is activated by an I2C reading. This is to ensure continuous diagnostics
throughout the car-radio operating time. To check the status of the device a sampling system is needed. The timing is chosen at microproces-
sor level (over half a second is recommended).
Figure 17. Restart timing without Diagnostic Enable (Permanent)
Each 1ms time, a sampling of the fault is done
Figure 18. Restart timing with Diagnostic Enable (Permanent)
