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TDA7381 Datasheet(PDF) 8 Page - STMicroelectronics |
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TDA7381 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 10 page tor has to be viewed mainly as a power-depend- ent feature rather than frequency-dependent. This means that clipping state will be immediately sig- naled out whenever a fixed power level is reached, regardless of the audio frequency. In other words, this feature offers the means to counteract the extremely sound-damaging effects of clipping, caused by a sudden increase of odd order harmonics and appearance of serious inter- modulation phenomena. Another possible kind of distortion control could be the setting of a maximum allowable THD limit (e.g. 0.5 %) over the entire audio frequency range. Besides offering no practical advantages, this procedure cannot be much accurate, as the non-clipping distortion is likely to vary over fre- quency. In case of OVERHEATING, pin 25 will signal out the junction temperature proximity to the thermal shut-down threshold. This will typically start about 2 oC before the thermal shut-down threshold is reached. As various kind of diagnostics information is avail- able at pin 25 (CLIPPING, SHORTS AND OVER- HEATING), it may be necessary to operate some distinctions on order to treat each event sepa- rately. This could be achieved by taking into ac- count the intrinsically different timing of the diag- nostics output under each circumstance. In fact, clipping will produce pulses normally much shorter than those present under faulty con- ditions. An example of circuit able to distinguish between the two occurrences is shown by fig. 7. STABILITY AND LAYOUT CONSIDERATIONS If properly layouted and hooked to standard car- radio speakers, the TDA7381 will be intrinsically stable with no need of external compensations such as output R-C cells. Due to the high number of channels involved, this translates into a very remarkable components saving if compared to similar devices on the market. To simplify pc-board layout designs, each ampli- fier stage has its own power ground externally ac- cessible (pins 2,8,18,24) and one supply voltage pin for each couple of them. Even more important, this makes it possible to achieve the highest possible degree of separation among the channels, with remarkable benefits in terms of cross-talk and distortion features. About the layout grounding, it is particularly im- portant to connect the AC-GND capacitor (C5)to the signal GND, as close as possible to the audio inputs ground: this will guarantee high rejection of any common mode spurious signals. The SVR capacitor (C6) has also to be connected to the signal GND. Supply filtering elements (C7,C8) have naturally to be connected to the power-ground and located as close as possible to the Vs pins. Pin 1, which is mechanically attached to the de- vice’s tab, needs to be tied to the cleanest power ground point in the pc-board, which is generally near the supply filtering capacitors. CLIP DET. (TO GAIN COMPRESSOR/ TONE CONTROL) T1 25 D95AU305 TDA7385 + - VREF VREF1 T2 FAULT, THERMAL SHUTDOWN (TO POWER SUPPLY SECTION, µP VOLTAGE REGULATOR, FLASHING SYSTEM) + - VREF2 T1 << T2 VREF ≥ VREF1 >> VREF2 Figure 7. TDA7381 TDA7381 8/10 |
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