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TPA3244 Datenblatt(PDF) 8 Page - Texas Instruments |
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TPA3244 Datenblatt(HTML) 8 Page - Texas Instruments |
8 / 31 page 8 TPA3244 SLASEC6 – APRIL 2016 www.ti.com Product Folder Links: TPA3244 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 7.3 Feature Description 7.3.1 Error Reporting The FAULT, and CLIP_OTW, pins are active-low, open-drain outputs. The function is for protection-mode signaling to a system-control device. Any fault resulting in device shutdown is signaled by the FAULT pin going low. Also, CLIP_OTW goes low when the device junction temperature exceeds 125°C (see Table 3). Table 3. Error Reporting FAULT CLIP_OTW DESCRIPTION 0 0 Overtemperature (OTE) or overload (OLP) or undervoltage (UVP) Junction temperature higher than 125°C (overtemperature warning) 0 0 Overload (OLP) or undervoltage (UVP). Junction temperature higher than 125°C (overtemperature warning) 0 1 Overload (OLP) or undervoltage (UVP). Junction temperature lower than 125°C 1 0 Junction temperature higher than 125°C (overtemperature warning) 1 1 Junction temperature lower than 125°C and no OLP or UVP faults (normal operation) Note that asserting either RESET low forces the FAULT signal high, independent of faults being present. TI recommends monitoring the CLIP_OTW signal using the system microcontroller and responding to an overtemperature warning signal by, that is, turning down the volume to prevent further heating of the device resulting in device shutdown (OTE). To reduce external component count, an internal pullup resistor to 3.3 V is provided on both FAULT and CLIP_OTW outputs. 7.4 Device Functional Modes 7.4.1 Device Protection System The TPA3244 device contains advanced protection circuitry carefully designed to facilitate system integration and ease of use, as well as to safeguard the device from permanent failure due to a wide range of fault conditions such as short circuits, overload, overtemperature, and undervoltage. The TPA3244 device responds to a fault by immediately setting the power stage in a high-impedance (Hi-Z) state and asserting the FAULT pin low. In situations other than overload and overtemperature error (OTE), the device automatically recovers when the fault condition has been removed, that is, the supply voltage has increased. The device will function on errors, as shown in Table 4. Table 4. Device Protection BTL MODE PBTL MODE SE MODE LOCAL ERROR IN TURNS OFF LOCAL ERROR IN TURNS OFF LOCAL ERROR IN TURNS OFF A A+B A A+B+C+D A A+B B B B C C+D C C C+D D D D Bootstrap UVP does not shutdown according to the table, it shuts down the respective halfbridge (non-latching, does not assert FAULT). 7.4.1.1 Overload and Short Circuit Current Protection The TPA3244 device has fast reacting current sensors with a programmable trip threshold (OC threshold) on all high-side and low-side FETs. To prevent output current to increase beyond the programmed threshold, TPA3244 has the option of either limiting the output current for each switching cycle (Cycle By Cycle Current Control, CB3C) or to perform an immediate shutdown of the output in case of excess output current (Latching Shutdown). CB3C prevents premature shutdown due to high output current transients caused by high level music transients |
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