參數(shù)資料
型號(hào)： TAS5342LADDV
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
封裝： PLASTIC, HTSSOP-44
文件頁(yè)數(shù)： 14/27頁(yè)
文件大小： 823K
代理商： TAS5342LADDV
Overcurrent (OC) Protection With Current
Pin-To-Pin Short Circuit Protection System
www.ti.com ........................................................................................................................................................................................... SLAS624 – NOVEMBER 2008
the voltage on the bootstrap capacitors. When the
In general, it is recommended to follow closely the
voltage on the bootstrap capacitors is less than
external component selection and PCB layout as
required
for
proper
control
of
the
High-Side
given in the Application section.
MOSFETs, the device will initiate bootstrap capacitor
For
added
flexibility,
the
OC
threshold
is
recharge sequences until the bootstrap capacitors are
programmable within a limited range using a single
properly charged for robust operation. This function
external resistor connected between the OC_ADJ pin
may be activated with PWM pulses less than 30 nS.
and AGND. (See the Electrical Characteristics section
Therefore, TI strongly recommends using a TI PWM
of this data sheet for information on the correlation
processor, such as TAS5518, TAS5086 or TAS5508,
between programming-resistor value and the OC
with the modulation index set at 97.7% to interface
threshold.) It should be noted that a properly
with TAS5342LA.
functioning
overcurrent
detector
assumes
the
presence of a properly designed demodulation filter at
the power-stage output. Short-circuit protection is not
Limiting and Overload Detection
provided directly at the output pins of the power stage
but
only
on
the
speaker
terminals
(after
the
The device has independent, fast-reacting current
demodulation filter). It is required to follow certain
detectors with programmable trip threshold (OC
guidelines when selecting the OC threshold and an
threshold) on all high-side and low-side power-stage
appropriate demodulation inductor:
FETs. See the following table for OC-adjust resistor
OC-Adjust Resistor Values
Max. Current Before OC Occurs
values. The detector outputs are closely monitored by
(k
)
(A), TC=75°C
two protection systems. The first protection system
22
8.4 A
controls the power stage in order to prevent the
output current from further increasing, i.e., it performs
33
6.8 A
a current-limiting function rather than prematurely
47
5.3 A
shutting down during combinations of high-level
music
transients
and
extreme
speaker
load
The reported max peak current in the table above is
impedance
drops.
If
the
high-current
situation
measured with continuous current in 1
, one
persists, i.e., the power stage is being overloaded, a
channel active and the other one muted.
second
protection
system
triggers
a
latching
shutdown, resulting in the power stage being set in
the high-impedance (Hi-Z) state. Current limiting and
(PPSC)
overload protection are independent for half-bridges
The PPSC detection system protects the device from
A and B and, respectively, C and D. That is, if the
permanent damage in the case that a power output
bridge-tied load between half-bridges A and B causes
pin (OUT_X) is shorted to GND_X or PVDD_X. For
an overload fault, only half-bridges A and B are shut
comparison the OC protection system detects an over
down.
current after the demodulation filter where PPSC
For the lowest-cost bill of materials in terms of
detects shorts directly at the pin before the filter.
component selection, the OC threshold measure
PPSC detection is performed at startup i.e. when
should be limited, considering the power output
VDD is supplied, consequently a short to either
requirement
and
minimum
load
impedance.
GND_X or PVDD_X after system startup will not
Higher-impedance loads require a lower OC
activate the PPSC detection system. When PPSC
threshold.
detection is activated by a short on the output, all half
The demodulation-filter inductor must retain at
bridges are kept in a Hi-Z state until the short is
least 5
H of inductance at twice the OC threshold
removed, the device then continues the startup
setting.
sequence and starts switching. The detection is
controlled globally by a two step sequence. The first
Unfortunately,
most
inductors
have
decreasing
step ensures that there are no shorts from OUT_X to
inductance
with
increasing
temperature
and
GND_X, the second step tests that there are no
increasing current (saturation). To some degree, an
shorts from OUT_X to PVDD_X. The total duration of
increase
in
temperature
naturally
occurs
when
this process is roughly proportional to the capacitance
operating at high output currents, due to core losses
of the output LC filter. The typical duration is < 15
and the dc resistance of the inductor's copper
ms/
F. While the PPSC detection is in progress, SD
winding. A thorough analysis of inductor saturation
is kept low, and the device will not react to changes
and thermal properties is strongly recommended.
applied to the RESET pins. If no shorts are present
Setting the OC threshold too low might cause issues
the PPSC detection passes, and SD is released. A
such
as
lack
of
enough
output
power
and/or
device reset will not start a new PPSC detection.
unexpected shutdowns due to too-sensitive overload
detection.
Copyright 2008, Texas Instruments Incorporated
21
Product Folder Link(s) :TAS5342LA
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TAS5342LADDVR 功能描述:音頻放大器 100W Stereo Dig Amp Pwr Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5342LDDV 功能描述:音頻放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5342LDDV6EVM 功能描述:音頻 IC 開發(fā)工具 TAS5342LDDV6EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TAS5342LDDVG4 功能描述:音頻放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5342LDDVR 功能描述:音頻放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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