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参数资料
| 型号： | TAS5342ADDV |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44 |
| 封装： | GREEN, PLASTIC, HTSSOP-44 |
| 文件页数： | 14/27页 |
| 文件大小： | 835K |
| 代理商： | TAS5342ADDV |
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Overcurrent (OC) Protection With Current
Pin-To-Pin Short Circuit Protection System
www.ti.com ........................................................................................................................................................................................... SLAS623 – NOVEMBER 2008
voltage on the bootstrap capacitors is less than
In general, it is recommended to follow closely the
required
for
proper
control
of
the
High-Side
external component selection and PCB layout as
MOSFETs, the device will initiate bootstrap capacitor
given in the Application section.
recharge sequences until the bootstrap capacitors are
For
added
flexibility,
the
OC
threshold
is
properly charged for robust operation. This function
programmable within a limited range using a single
may be activated with PWM pulses less than 30 nS.
external resistor connected between the OC_ADJ pin
Therefore, TI strongly recommends using a TI PWM
and AGND. (See the Electrical Characteristics section
processor, such as TAS5518, TAS5086 or TAS5508,
of this data sheet for information on the correlation
with the modulation index set at 97.7% to interface
between programming-resistor value and the OC
with TAS5342A.
threshold.) It should be noted that a properly
functioning
overcurrent
detector
assumes
the
presence of a properly designed demodulation filter at
Limiting and Overload Detection
the power-stage output. Short-circuit protection is not
provided directly at the output pins of the power stage
The device has independent, fast-reacting current
but
only
on
the
speaker
terminals
(after
the
detectors with programmable trip threshold (OC
demodulation filter). It is required to follow certain
threshold) on all high-side and low-side power-stage
guidelines when selecting the OC threshold and an
FETs. See the following table for OC-adjust resistor
appropriate demodulation inductor:
values. The detector outputs are closely monitored by
OC-Adjust Resistor Values
Max. Current Before OC Occurs
two protection systems. The first protection system
(k
)
(A), TC=75°C
controls the power stage in order to prevent the
27
10.1
output current from further increasing, i.e., it performs
a current-limiting function rather than prematurely
33
9.1
shutting down during combinations of high-level
47
7.1
music
transients
and
extreme
speaker
load
impedance
drops.
If
the
high-current
situation
The reported max peak current in the table above is
persists, i.e., the power stage is being overloaded, a
measured with continuous current in 1
, one
second
protection
system
triggers
a
latching
channel active and the other one muted.
shutdown, resulting in the power stage being set in
the high-impedance (Hi-Z) state. Current limiting and
overload protection are independent for half-bridges
(PPSC)
A and B and, respectively, C and D. That is, if the
The PPSC detection system protects the device from
bridge-tied load between half-bridges A and B causes
permanent damage in the case that a power output
an overload fault, only half-bridges A and B are shut
pin (OUT_X) is shorted to GND_X or PVDD_X. For
down.
comparison the OC protection system detects an over
For the lowest-cost bill of materials in terms of
current after the demodulation filter where PPSC
component selection, the OC threshold measure
detects shorts directly at the pin before the filter.
should be limited, considering the power output
PPSC detection is performed at startup i.e. when
requirement
and
minimum
load
impedance.
VDD is supplied, consequently a short to either
Higher-impedance loads require a lower OC
GND_X or PVDD_X after system startup will not
threshold.
activate the PPSC detection system. When PPSC
The demodulation-filter inductor must retain at
detection is activated by a short on the output, all half
least 5
H of inductance at twice the OC threshold
bridges are kept in a Hi-Z state until the short is
setting.
removed, the device then continues the startup
sequence and starts switching. The detection is
Unfortunately,
most
inductors
have
decreasing
controlled globally by a two step sequence. The first
inductance
with
increasing
temperature
and
step ensures that there are no shorts from OUT_X to
increasing current (saturation). To some degree, an
GND_X, the second step tests that there are no
increase
in
temperature
naturally
occurs
when
shorts from OUT_X to PVDD_X. The total duration of
operating at high output currents, due to core losses
this process is roughly proportional to the capacitance
and the dc resistance of the inductor's copper
of the output LC filter. The typical duration is < 15
winding. A thorough analysis of inductor saturation
ms/
F. While the PPSC detection is in progress, SD
and thermal properties is strongly recommended.
is kept low, and the device will not react to changes
Setting the OC threshold too low might cause issues
applied to the RESET pins. If no shorts are present
such
as
lack
of
enough
output
power
and/or
the PPSC detection passes, and SD is released. A
unexpected shutdowns due to too-sensitive overload
device reset will not start a new PPSC detection.
detection.
Copyright 2008, Texas Instruments Incorporated
21
Product Folder Link(s): TAS5342A
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相关代理商/技术参数 |
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|---|---|
| TAS5342ADDVR | 功能描述:音频放大器 100W Stereo Dig Amp Pwr Stage RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5342DDV | 功能描述:音频放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5342DDV | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP CLASS D 100W HTSSOP-44 |
| TAS5342DDV6EVM | 功能描述:音频 IC 开发工具 TAS5342DDV6EVM Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TAS5342DDVG4 | 功能描述:音频放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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