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TPA3255DDVR Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte TPA3255DDVR
Spiegazioni elettronici  600W Mono PurePath Ultra-HD Analog-Input
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPA3255
SLASEA8 – FEBRUARY 2016
www.ti.com
Product Folder Links: TPA3255
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
9.3 Feature Description
9.3.1 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 2).
Table 2. 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.
9.4 Device Functional Modes
9.4.1 Device Protection System
The TPA3255 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 TPA3255 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 3.
Table 3. 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).
9.4.1.1 Overload and Short Circuit Current Protection
TPA3255 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, TPA3255 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 and a


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