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TDA7564 데이터시트(PDF) 8 Page - STMicroelectronics |
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TDA7564 데이터시트(HTML) 8 Page - STMicroelectronics |
8 / 20 page TDA7564 8/20 Figure 14. Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 4 Ω) Figure 15. Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 2 Ω) 012345 Po (W) 0 5 10 15 20 25 30 35 40 45 Ptot (W) Vs = 14 V RL = 4 x 4 Ohm GAUSSIAN NOISE STD MODE HI-EFF MODE CLIP START 012345 6789 Po (W) 0 10 20 30 40 50 60 70 80 90 Ptot (W) Vs = 14 V RL = 4 x 2 Ohm GAUSSIAN NOISE STD MODE HI-EFF MODE 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. 16) 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 16. Turn - On diagnostic: working principle CH- CH+ Isource Vs~5V Isink t (ms) I (mA) Isink Isource ~100mS Measure time |
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