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参数资料
| 型号： | TAS5132DDVRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 50 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44 |
| 封装： | GREEN, PLASTIC, HTSSOP-44 |
| 文件页数： | 11/26页 |
| 文件大小： | 574K |
| 代理商： | TAS5132DDVRG4 |
www.ti.com
ERROR REPORTING
Use
of
TAS5132
in
High-Modulation-Index
Overcurrent
(OC)
Protection
With
Current
DEVICE PROTECTION SYSTEM
SLES190 – DECEMBER 2006
When the TAS5132 is being used with TI PWM
PWM inputs that will detect the condition when a
modulators such as
the
TAS5086,
no
special
PWM input is continuously high or low. This function
attention to the state of RESET_AB and RESET_CD
is named PWM Activity Detector (PAD). Without this
is required, provided that the chipset is configured as
protection circuitry, if a PWM input is continuously
recommended.
high or low, the PVDD power supply voltage could
appear on the associated output pin. This condition
could damage either the output load (loudspeaker) or
the device. If a PWM input remains either high or low
The
SD
and
OTW
pins
are
both
active-low,
for over 10
S, the device's outputs will be set into a
open-drain
outputs.
Their
function
is
for
Hi-Z state. If this error condition occurs, SD will not
protection-mode signaling to a PWM controller or
be asserted low.
other system-control device.
Any fault resulting in device shutdown is signaled by
Capable Systems
the SD pin going low. Likewise, OTW goes low when
the device junction temperature exceeds 125
°C (see
This device requires at least 50 ns of low time on the
the following table).
output per 384-kHz PWM frame rate in order to keep
the bootstrap capacitors charged. As an example, if
SD
OTW
DESCRIPTION
the modulation index is set to 99.2% in the TAS5086,
0
Overtemperature (OTE) or overload (OLP) or
this setting allows PWM pulse durations down to 20
undervoltage (UVP)
ns. This signal, which does not meet the 50-ns
0
1
Overload (OLP) or undervoltage (UVP)
requirement, is sent to the PWM_X pin, and this
1
0
Junction temperature higher than 125
°C
low-state pulse time does not allow the bootstrap
(overtemperature warning)
capacitor to stay charged. In this situation, the low
1
Junction temperature lower than 125
°C and no
voltage across the bootstrap capacitor can cause the
OLP or UVP faults (normal operation)
bootstrap UVP circuitry to avtivate and shutdown the
device. The TAS5132 device requires limiting the
Note that asserting either RESET_AB or RESET_CD
TAS5086 modulation index to 96.1% to keep the
low forces the SD signal high, independent of faults
bootstrap capacitor charged under all signals and
being present. TI recommends monitoring the OTW
loads.
signal
using
the
system
microcontroller
and
responding to an overtemperature warning signal by,
Therefore, TI strongly recommends using a TI PWM
e.g., turning down the volume to prevent further
processor, such as TAS5508 or TAS5086, with the
heating of the device, resulting in device shutdown
modulation index set at 96.1% to interface with
(OTE).
TAS5132. This is done by writing 0x04 to the
Modulation Limit Register (0x10) in the TAS5086 or
To reduce external component count, an internal
0x04 to the Modulation Limit Register (0x16) in the
pullup resistor to 3.3 V is provided on both SD and
TAS5508.
OTW outputs. Level compliance for 5-V logic can be
obtained by adding external pullup resistors to 5 V
(see the Electrical Characteristics section of this data
Limiting and Overload Detection
sheet for further specifications).
The device has independent, fast-reacting current
detectors
with
on
all
high-side
and
low-side
power-stage FETs. See the following table for
The TAS5132 contains advanced protection circuitry
OC-adjust resistor values. The detector outputs are
carefully designed to facilitate system integration and
closely monitored by two protection systems. The
ease of use, as well as to safeguard the device from
first protection system controls the power stage in
permanent failure due to a wide range of fault
order to prevent the output current from further
conditions
such
as
short
circuits,
overload,
increasing, i.e., it performs a current-limiting function,
overtemperature, and undervoltage. The TAS5132
rather
than
prematurely
shutting
down
during
responds to a fault by immediately setting the power
combinations of high-level music transients and
stage in a high-impedance (Hi-Z) state and asserting
extreme speaker load impedance drops. If the
the SD pin low. In situations other than overload and
high-current situation persists, i.e., the power stage
overtemperature, the device automatically recovers
is being overloaded, a second protection system
when the fault condition has been removed. For
triggers a latching shutdown, resulting in the power
highest
possible
reliability,
recovering
from
an
stage being set in the high-impedance (Hi-Z) state.
overload fault requires external reset of the device
(see the Device Reset section of this data sheet) no
sooner than 1 second after the shutdown.
The TAS5132 contains circuitry associated with its
19
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