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参数资料
| 型号： | TAS5186ADDVG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 60 W, 6 CHANNEL, AUDIO AMPLIFIER, PDSO44 |
| 封装： | GREEN, PLASTIC, HTSSOP-44 |
| 文件页数： | 4/20页 |
| 文件大小： | 609K |
| 代理商： | TAS5186ADDVG4 |
www.ti.com
Device Protection System
OVERCURRENT (OC) PROTECTION WITH
TAS5186A
SLES156 – OCTOBER 2005
Any fault resulting in device shutdown is signaled by
two protection systems. The first protection system
the SD pin going low. Likewise, OTW goes low when
controls the power stage in order to prevent the
the device junction temperature exceeds 125°C (see
output current from further increasing. i.e., it performs
the following table).
a current-limiting function rather than prematurely
shutting down during combinations of high-level
music
transients
and
extreme
speaker
SD
OTW
DESCRIPTION
load-impedance drops. If the high-current situation
persists, i.e., the power stage is being overloaded, a
0
Overtemperature (OTE) or overload (OLP) or
undervoltage (UVP)
second
protection
system
triggers
a
latching
shutdown, resulting in the power stage being set in
0
1
Overload (OLP) or undervoltage (UVP)
the high-impedance (Hi-Z) state.
1
0
Overtemperature warning. Junction temperature
higher than 125°C, typical
For
added
flexibility,
the
OC
threshold
is
1
Normal operation. Junction temperature lower than
programmable within a limited range using a single
125°C, typical
external resistor connected between the OC_ADJ pin
and AGND.
It should be noted that asserting RESET low forces
OC-Adjust Resistor Values
Maximum Peak Current Before
the SD and OTW signals high independently of faults
(k
)
OC Occurs (A)
being present. It is recommended to monitor the
18
4.5 (sat.), 8 (sub.)
OTW signal using the system microcontroller and to
respond to an overtemperature warning signal by,
It should be noted that a properly functioning
e.g., turning down the volume to prevent further
overcurrent detector assumes the presence of a
heating of the device that would result in device
properly
designed
demodulation
filter
at
the
shutdown (OTE). To reduce external component
power-stage output. Short-circuit protection is not
count, an internal pullup resistor to 3.3 V is provided
provided directly at the output pins of the power stage
on both the SD and OTW outputs. Level compliance
but
only
on
the
speaker
terminals
(after
the
for 5-V logic can be obtained by adding external
demodulation filter). It is required to follow certain
pullup
resistors
to
5
V
(see
the
Electrical
guidelines when selecting the OC threshold and an
Characteristics section of this data sheet for further
appropriate demodulation inductor.
specifications).
For the lowest-cost bill of materials in terms of
component selection, the OC threshold current
should be limited, considering the power output
The TAS5186A contains advanced protection circuitry
requirement
and
minimum
load
impedance.
carefully designed to facilitate system integration and
Higher-impedance loads require a lower OC
ease of use, as well as safeguarding the device from
threshold.
permanent failure due to a wide range of fault
The demodulation filter inductor must retain at
conditions such as short circuit, overload, and
least 5
H of inductance at twice the OC
undervoltage. The TAS5186A responds to a fault by
threshold setting.
immediately
setting
the
power
stage
in
a
high-impedance state (Hi-Z) and asserting the SD pin
Most inductors have decreasing inductance with
low. In situations other than overload, the device
increasing
temperature
and
increasing
current
automatically recovers when the fault condition has
(saturation).
To
some
degree,
an
increase
in
been removed, e.g., the supply voltage has increased
temperature naturally occurs when operating at high
or the temperature has dropped. For highest possible
output currents, due to inductor core losses and the
reliability, recovering from an overload fault requires
dc resistance of the inductor copper winding. A
external reset of the device no sooner than 1 second
thorough analysis of inductor saturation and thermal
after the shutdown (see the Device Reset section of
properties is strongly recommended.
this data sheet).
Setting the OC threshold too low might cause issues
such as lack of output power and/or unexpected
shutdowns due to sensitive overload detection.
CURRENT LIMITING AND OVERLOAD
DETECTION
In general, it is recommended to follow closely the
external component selection and PCB layout as
The device has independent, fast-reacting current
given in the application section.
detectors with programmable trip threshold (OC
threshold) on all high-side and low-side power-stage
FETs. See the following table for OC-adjust resistor
values. The detector outputs are closely monitored by
12
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相关代理商/技术参数 |
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|---|---|
| TAS5186ADDVR | 功能描述:音频放大器 6-Ch 210-W Digital PowerStage 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 |
| TAS5186ADDVRG4 | 功能描述:音频放大器 6-Ch 210-W Digital PowerStage 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 |
| TAS5186DDV | 功能描述:音频放大器 6 CHANNEL POWERSTAGE 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 |
| TAS5186DDVG4 | 功能描述:音频放大器 6 CHANNEL POWERSTAGE 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 |
| TAS5186DDVR | 功能描述:音频放大器 6 CHANNEL POWERSTAGE 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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