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参数资料
| 型号： | TAS5176DDWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 40 W, 6 CHANNEL, AUDIO AMPLIFIER, PDSO44 |
| 封装： | GREEN, PLASTIC, HTSSOP-44 |
| 文件页数： | 9/25页 |
| 文件大小： | 771K |
| 代理商： | TAS5176DDWR |
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Device Protection System
OVERCURRENT (OC) PROTECTION WITH
SLES196 – JUNE 2007
Any fault resulting in device shutdown is signaled by
system controls the power stage in order to prevent
the SD pin going low. Likewise, OTW goes low when
the output current from further increasing. I.e., it
the device junction temperature exceeds 125
°C (see
performs a current-limiting function
rather
than
the following table).
prematurely shutting down during combinations of
high-level music transients and extreme speaker
SD
OTW
DESCRIPTION
load-impedance drops. If the high-current situation
0
Overtemperature (OTE) or overload (OLP) or
persists, i.e., the power stage is being overloaded, a
undervoltage (UVP)
second
protection
system
triggers
a
latching
0
1
Overload (OLP) or undervoltage (UVP)
shutdown, resulting in the power stage being set in
1
0
Overtemperature warning. Junction temperature
the high-impedance (Hi-Z) state.
higher than 125
°C, typical
For
added
flexibility,
the
OC
threshold
is
1
Normal operation. Junction temperature lower
programmable within a limited range using a single
than 125
°C, typical
external resistor connected between the OC_ADJ pin
It should be noted that asserting RESET low forces
and AGND.
the SD and OTW signals high independently of faults
OC-Adjust Resistor Values
Maximum Current Before OC
being present. It is recommended to monitor the
(k
Ω)
Occurs (A)
OTW signal using the system microcontroller and to
18K
4.5 (sat), 8.0 (sub)
respond to an overtemperature warning signal by,
27K
TBD
e.g., turning down the volume to prevent further
heating of the device that would result in device
It should be noted that a properly functioning
shutdown (OTE). To reduce external component
overcurrent detector assumes the presence of a
count, an internal pullup resistor to 3.3 V is provided
properly
designed
demodulation
filter
at
the
on both the SD and OTW outputs. Level compliance
power-stage output. Short-circuit protection is not
for 5-V logic can be obtained by adding external
provided directly at the output pins of the power
pullup
resistors
to
5
V
(see
the
Electrical
stage but only on the speaker terminals (after the
Characteristics section of this data sheet for further
demodulation filter). It is required to follow certain
specifications).
guidelines when selecting the OC threshold and an
appropriate demodulation inductor.
For the lowest-cost bill of materials in terms of
The TAS5176 contains advanced protection circuitry
component selection, the OC threshold current
carefully designed to facilitate system integration and
should be limited, considering the power output
ease of use, as well as safeguarding the device from
requirement
and
minimum
load
impedance.
permanent failure due to a wide range of fault
Higher-impedance loads require a lower OC
conditions such as short circuit, overload, and
threshold.
undervoltage. The TAS5176 responds to a fault by
The demodulation filter inductor must retain at
immediately
setting
the
power
stage
in
a
least 5
μH of inductance at twice the OC
high-impedance state (Hi-Z) and asserting the SD
threshold setting.
pin low. In situations other than overload, the device
Most inductors have decreasing inductance with
automatically recovers when the fault condition has
increasing
temperature
and
increasing
current
been
removed,
e.g.,
the
supply
voltage
has
(saturation).
To
some
degree,
an
increase
in
increasedor
the
temperature
has
dropped.
For
temperature naturally occurs when operating at high
highest
possible
reliability,
recovering
from
an
output currents, due to inductor core losses and the
overload fault requires external reset of the device
dc resistance of the inductor copper winding. A
no sooner than 1 second after the shutdown (see the
thorough analysis of inductor saturation and thermal
Device Reset section of this data sheet).
properties is strongly recommended.
Setting the OC threshold too low might cause issues
CURRENT LIMITING AND OVERLOAD
such as lack of output power and/or unexpected
DETECTION
shutdowns due to sensitive overload detection.
The device has independent, fast-reacting current
In general, it is recommended to follow closely the
detectors with programmable trip threshold (OC
external component selection and PCB layout as
threshold) on all high-side and low-side power-stage
given in the application section.
FETs. See the following table for OC-adjust resistor
values. The detector outputs are closely monitored
by two protection systems. The first protection
17
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相关代理商/技术参数 |
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| TAS5176DDWRG4 | 功能描述:音频放大器 5.1Ch 100W Dig Amp 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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| TAS5182_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:100−W STEREO DIGITAL AMPLIFIER POWER STAGE CONTROLLER |
| TAS5182DCA | 功能描述:音频放大器 Dig Amp Pwr Stage Controller 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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