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TPA3220 Datasheet(PDF) 21 Page - Texas Instruments |
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TPA3220 Datasheet(HTML) 21 Page - Texas Instruments |
21 / 39 page ![]() 21 TPA3220 www.ti.com SLASEN3 – JANUARY 2018 Product Folder Links: TPA3220 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 9.4.3 Device Reset Asserting RESET low initiates the device ramp down. The output FETs go into a Hi-Z state after the ramp down is complete. Output pull downs are active in both BTL mode and PBTL mode with RESET low. In BTL modes, to accommodate bootstrap charging prior to switching start, asserting the RESET input low enables weak pull-down of the half-bridge outputs. Asserting RESET low removes any fault information to be signaled on the FAULT output, that is, FAULT is forced high. A rising-edge transition on RESET allows the device to resume operation after a fault. To ensure thermal reliability, the rising edge of RESET must occur no sooner than 4 ms after the falling edge of FAULT. The TPA3220 will enter a low power state once the ramp down sequence is complete. 9.4.4 Device Soft Mute Asserting CMUTE low initiates the device soft mute function. The soft mute function initiates a ramp down sequence of the outputs, and the output FETs go into a Hi-Z state after the ramp down is complete. All internal circuits are powered while in soft mute state. External control of the soft mute function must provide high impedance output when not engaged (open drain output) to allow the CMUTE node to charge/discharge during device ramp up and ramp down when de-asserting and asserting RESET. 9.4.5 Device Protection System The TPA3220 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, overvoltage and undervoltage. The TPA3220 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 handle errors, as shown in Table 5. Table 5. Device Protection BTL MODE PBTL MODE LOCAL ERROR IN TURNS OFF LOCAL ERROR IN TURNS OFF A A+B A A+B+C+D B B C C+D C D D Bootstrap UVP does not shutdown according to the table, it shuts down the respective halfbridge (non-latching, does not assert FAULT). 9.4.5.1 Overload and Short Circuit Current Protection TPA3220 has fast reacting current sensors on all high-side and low-side FETs. To prevent output current from increasing beyond the overcurrent threshold, TPA3220 uses current limiting of the output current for each switching cycle (Cycle By Cycle Current Control, CB3C) in case of excess output current. CB3C prevents premature shutdown due to high output current transients caused by high level music transients and a drop of real speaker’s load impedance, and allows the output current to be limited to a maximum programmed level. If the maximum output current persists, i.e. the power stage being overloaded with too low load impedance, the device will shut down the affected output channel and the affected output is put in a high-impedance (Hi- Z) state until a RESET cycle is initiated. CB3C works individually for each full-bridge output. If an over current event is triggered, CB3C performs a state flip of the full-bridged output that is cleared upon beginning of next PWM frame. |
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