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TDA7561 Datasheet(PDF) 8 Page - STMicroelectronics |
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TDA7561 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 19 page TDA7561 8/19 Figure 12. Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 4 Ω) Figure 13. Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 2 Ω) 01 234 5 Po (W) 5 10 15 20 25 30 35 40 45 Ptot (W) CLIP START Vs = 14.4 V RL = 4x4 Ohm GAUSSIAN NOISE 0123 45678 Po (W) 0 10 20 30 40 50 60 70 80 90 Ptot (W) Vs = 14.4 V RL = 4x2 Ohm GAUSSIAN NOISE CLIP START 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 I2C 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 CH- CH+ Isource Vs~5V Isink t (ms) I (mA) Isink Isource ~100ms Measure time |
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