Texas Instruments TAS5105EVM, Руководство пользователя

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Protection
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5 Protection
This section describes the short-circuit protection and fault-reporting circuitry of the TAS5105 device.
5.1 Short-Circuit Protection and Fault-Reporting Circuitry
The TAS5105 is a self-protecting device that provides fault reporting (including high-temperature
protection and short-circuit protection). For highest possible reliability, recovering from a fault requires
external reset of the device. This is done by the TAS5012 on the MC016 board. See the TAS5105 data
sheet for more information regarding the RESET function.
5.2 Fault Reporting
The OTW and FAULT outputs from TAS5105 indicate fault conditions. See the TAS5105 data sheet
(
SLES258 ) for a description of these pins.
Table 6. TAS5105 Warning/Error Signal Decoding
FAULT OTW Device Condition
0 0 Overcurrent (OC) or undervoltage (UVP) warning or overtemperature error (OTE)
0 1 Overtemperature warning (OTW) or overcurrent (OC) or undervoltage (UVP)
1 0 Junction temperature lower than 125°C and no faults (normal operation)
1 1 Junction temperature higher than 125°C (overtemperature warning)
The FAULT output is open-drain. The OTW output is push-pull active high.
The OTW LED on the MC016 is illuminated when the temperature of the TAS5105 is okay (less than
125°C.) The LED turns off when the TAS5105 is warning of overtemperature on the device (T
J
> 125°C.)
This polarity is due to a reversal of polarity of the OTW pin from other devices (e.g., TAS5132) which also
use this modulator board.
10 TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage SLLU138 – January 2011
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