Chapter 3
SLEU071 – June 2006
Protection
This chapter describes the short-circuit protection and fault-reporting circuitry of the TAS5142 device.
3.1Short-Circuit Protection and Fault-Reporting Circuitry
The TAS5142 is a self-protecting device that provides fault reporting (including high-temperature protection and short-circuit protection). The TAS5142 is configured in back-end auto-recovery mode and, therefore, resets automatically after all errors (M1, M2, and M3 are set low). This means that the device will restart itself after a error occasion and report through the SD error signal.
3.2Fault Reporting
The OTW and SD outputs from the TAS5142 indicate fault conditions. Please refer to the TAS5142 Data Manual for a description of these pins.
Table 3-1. TAS5142 Warning/Error Signal Decoding
OTW | SD | DEVICE CONDITION |
0 | 0 | High-temperature error and/or high-current error |
0 | 1 | High-temperature warning |
1 | 0 | Undervoltage lockout or high-current error |
1 | 1 | Normal operation, no errors/warnings |
The temperature warning signals at the TAS5508-5142K7EVM board are wired-OR to one temperature warning signal (OTW – pin 22 in control interface connector). Shutdown signals are wired-OR into one shutdown signal (SD – pin 20 in control interface connector).
The shutdown signals, together with the temperature warning signal, give chip state information as described in Table 3-1. Device fault-reporting outputs are open-drain outputs.
SLEU071 –June 2006 | Protection | 15 |
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