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TDA7476 Datasheet(PDF) 4 Page - STMicroelectronics |
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TDA7476 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 15 page Symbol Parameter Test Condition Min. Typ. Max. Unit AUX INPUTS - PERMANENT DIAGNOSTIC Agnd Short to GND det. (above this limit, the Audio Output is considered in Short Circuit to Vs) This condition must be true for a time higher than Tdel High side driver ON 0.75 V Aol Open load det. (voltage across the sensing resistor. Below this limit the Aux pin is considered in Open Load condition) This condition must be true for a time higher than Tdel 0.085 V Anop Normal Operation det. (Voltage across the sensing resistor. Within these limits the load resistance connected to the Aux pin is considered correct) 0.125 0.5 V PERMANENT DIAGNOSTIC - ACQUISITION TIME DELAY Tdel Acquisition time delay - The fault is considered true if the fault condition are present for more than Tdel without interruption 2s PERMANENT DIAGNOSTIC - WARNING PIN Vsat Saturation voltage on pin 5 Sink Current at Pin 5 = 1mA 1 V ADDRESS SELECT VADD Voltage on pin 4 Address 0100010X 1.5 V Address 0100011X 3 5 V I 2C BUS INTERFACE fSCL Clock Frequency 400 KHz VIL Input Low Voltage 1.5 V VIH InputHigh Voltage 3 V VSAT Sat Voltage at pin 2 Sink Current at Pin 2 = 5mA 1.5 V ELECTRICAL CHARACTERISTICS (continued) WORKING PRINCIPLES Turn-on diagnostic - CH1, CH2, CH3, CH4, CH5 - Shorted load/open load detection To detect a short across the load or an open load, a subsonic current pulse is generated. The infor- mation related to the status of the outputs are measured and memorized at the top of the current pulse (tm in fig.1). The current is sourced by the positive pins (CH1+,...CH5+) and it is sunk by the corresponding negative pins (CH1-,...CH5-). Isink and Isource are depending on the external resistor Rcs. The minimum allowed value for Rcs is 1.65KOhm. The relationship among Isink, Isource and Rcs is the following: Isink = (3.3/Rcs) x 11 Isource = 1.5 x Isink tm ts t(ms) ISOURCE ISINK I(mA) D97AU571 Figure 1. TDA7476 4/15 |
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