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TPA3221 Datasheet(PDF) 22 Page - Texas Instruments

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Part # TPA3221
Description  100-W Stereo, 200-W Mono HD-Audio, Analog-Input, Class-D Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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TPA3221
SLASEE9 – JUNE 2017
www.ti.com
Product Folder Links: TPA3221
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Copyright © 2017, 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 pulldown 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 TPA3221 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 teh soft mute function must provide hig
impedance output when not engaged (open drain output) to allow the CMUTE node to charge/discharge during
device ramp up and ramp down when desserting and assertinng RESET.
9.4.5 Device Protection System
The TPA3221 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 TPA3221 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
TPA3221 has fast reacting current sensors on all high-side and low-side FETs. To prevent output current from
increasing beyond the over current threshold, TPA3221 uses current limiting ofthe 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 half bridge output. If an over current event is
triggered, CB3C performs a state flip of the half bridge output that is cleared upon beginning of next PWM frame.


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