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TDA7561
MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES
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TDA7561December 2002 DMOS POWER OUTPUT HIGH OUTPUT POWER CAPABILITY 4x25W/
4W @ 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 (FOR LOW
NOISE LINE OUTPUT FUNCTION)2 C BUS DIGITAL DIAGNOSTICS FULL FAULT PROTECTION DC OFFSET DETECTION FOUR INDEPENDENT SHORT CIRCUIT
PROTECTION CLIPPING DETECTOR ESD PROTECTION
DESCRIPTIONThe TDA7561 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 TDA7561 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 con-
figuration and behaviour of the device by means of
the I2 C bus makes TDA7561 a very flexible machine.
MULTIFUNCTION QUAD POWER AMPLIFIER
WITH BUILT-IN DIAGNOSTICS FEATURES
BLOCK DIAGRAM
TDA7561 2/19
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTION
3/19
TDA7561
Figure 1. Test and Application Circuit
TDA7561 4/19
ELECTRICAL CHARACTERISTCS (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz;Tamb = 25°C; unless otherwise specified).
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TDA7561
ELECTRICAL CHARACTERISTCS (continued)(Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz;Tamb = 25°C; unless otherwise specified).
TDA7561 6/19
ELECTRICAL CHARACTERISTCS (continued)(Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz;Tamb = 25°C; unless otherwise specified).
Figure 2. Quiescent Current vs. Supply Voltage
Figure 3. Output Power vs. Supply Voltage (2Ω)
Figure 4. Output Power vs. Supply Voltage (4Ω)
Figure 5. Distortion vs. Output Power (2Ω)
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TDA7561
Figure 6. Distortion vs. Output Power (2Ω)
Figure 7. Distortion vs. Frequency (4Ω)
Figure 8. Distortion vs. Frequency (2Ω)
Figure 9. Crosstalk vs. Frequency
Figure 10. Supply Voltage Rejection
vs.Frequency
Figure 11. Power Dissipation & Efficiency
vs.Output Power (4Ω, SINE)
TDA7561 8/19
Figure 12. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 4Ω)
Figure 13. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 2Ω)
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 principle
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TDA7561Fig. 15 and 16 show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and without TURN-ON
DIAGNOSTIC.
The 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:
TDA7561 10/19
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:
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
The TDA7561 has 2 operating statuses:
1) RESTART mode. The diagnostic is not enabled. Each audio channel operates independently from each oth-
er. 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.
2) DIAGNOSTIC mode. It is enabled via I2 C bus and self activates if an output overload (such to cause the in-
tervention of the short-circuit protection) occurs to the speakers outputs . Once activated, the diagnostics pro-
cedure 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 performed and the chan-
nel returns back active.
- Instead, if an overload is detected during the check after 1 ms, then a diagnostic cycle having a duration 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 I2 C reading. This is to ensure continuous diagnostics throughout the car-radio op-
erating time.
- To check the status of the device a sampling system is needed. The timing is chosen at microprocessor level
(over half a second is recommended).
