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参数资料
型号： TAS5162DKDG4
厂商： TEXAS INSTRUMENTS INC
元件分类： 音频／视频放大
英文描述： 400 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
封装： GREEN, PLASTIC, HSSOP-36
文件页数： 15/32页
文件大小： 974K
代理商： TAS5162DKDG4
www.ti.com
Use
of
TAS5162
in
High-Modulation-Index
Overcurrent
(OC)
Protection
With
Current
Overtemperature Protection
TAS5162
SLES194D – OCTOBER 2006 – REVISED JULY 2007
overload protection are independent for half-bridges
Capable Systems
A and B and, respectively, C and D. That is, if the
bridge-tied load between half-bridges A and B
This device requires at least 50 ns of low time on the
causes an overload fault, only half-bridges A and B
output per 384-kHz PWM frame rate in order to keep
are shut down.
the bootstrap capacitors charged. As an example, if
For the lowest-cost bill of materials in terms of
the modulation index is set to 99.2% in the TAS5508,
component selection, the OC threshold measure
this setting allows PWM pulse durations down to 20
should be limited, considering the power output
ns. This signal, which does not meet the 50-ns
requirement
and
minimum
load
impedance.
requirement, is sent to the PWM_X pin and this
Higher-impedance loads require a lower OC
low-state pulse time does not allow the bootstrap
threshold.
capacitor to stay charged. In this situation, the low
voltage across the bootstrap capacitor can cause a
The demodulation-filter inductor must retain at
failure
of
the
high-side
MOSFET
transistor,
least 5
μH of inductance at twice the OC
especially when driving a low-impedance load. The
threshold setting.
TAS5162 device requires limiting the TAS5508
Unfortunately,
most
inductors
have
decreasing
modulation index to less than 97.0% to keep the
inductance
with
increasing
temperature
and
bootstrap capacitor charged under all signals and
increasing current (saturation). To some degree, an
loads.
increase
in
temperature
naturally
occurs
when
The device contains bootstrap
capacitor
under
operating at high output currents, due to core losses
voltage protection circuit (BST_UVP) that monitors
and the dc resistance of the inductor's copper
the voltage on the bootstrap capacitors. When the
winding. A thorough analysis of inductor saturation
voltage on the on the bootstrap capacitors is less
and thermal properties is strongly recommended.
than required for safe operation, the TAS5162 will
Setting the OC threshold too low might cause issues
initiate bootstrap capacitor recharge sequences until
such as lack of enough output power and/or
the bootstrap capacitors are properly charged for
unexpected shutdowns due to too-sensitive overload
safe operation. This function may be activated at a
detection.
modulation index of greater than 97.0%
In general, it is recommended to follow closely the
TI strongly recommends using a TI PWM processor,
external component selection and PCB layout as
such as TAS5508 or TAS5086, with the modulation
given in the Application section.
index set at 96.1% to interface with TAS5162.
For
added
flexibility,
the
OC
threshold
is
The Modulation Index is set by writing 0x04 to the
programmable within a limited range using a single
Modulation Index Limit
Register
(0x16)
in
the
external resistor connected between the OC_ADJ pin
TAS5508B or TAS5518A. In the case of the
and
AGND.
(See
the
Electrical
Characteristics
TAS5086 a 0x04 is written to the Modulation Limit
section of this data sheet for information on the
Register (0x10).
correlation between programming-resistor value and
the OC threshold.) It should be noted that a properly
functioning
overcurrent
detector
assumes
the
Limiting and Overload Detection
presence of a properly designed demodulation filter
The device has independent, fast-reacting current
at the power-stage output. Short-circuit protection is
detectors with programmable trip threshold (OC
not provided directly at the output pins of the power
threshold) on all high-side and low-side power-stage
stage but only on the speaker terminals (after the
FETs. See the following table for OC-adjust resistor
demodulation filter). It is required to follow certain
values. The detector outputs are closely monitored
guidelines when selecting the OC threshold and an
by two protection systems. The first protection
appropriate demodulation inductor:
system controls the power stage in order to prevent
OC-Adjust Resistor Values Max. Current Before OC Occurs
the output current from further increasing, i.e., it
(k
)
(A)
performs a current-limiting function
rather
than
22
12.2
prematurely shutting down during combinations of
27
10.5
high-level music transients and extreme speaker
load impedance drops. If the high-current situation
47
6.4
persists, i.e., the power stage is being overloaded, a
68
4.0
second
protection
system
triggers
a
latching
100
3.0
shutdown, resulting in the power stage being set in
the high-impedance (Hi-Z) state. Current limiting and
The TAS5162 has a two-level temperature-protection
22
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相关PDF资料
PDF描述
TAS5162DDVRG4 210 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5162DDVG4 210 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5162DKD 400 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TAS5162DKDR 400 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TAS5162DDV 210 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
相关代理商/技术参数
参数描述
TAS5162DKDR 功能描述:音频放大器 2x210W St Dig Pwr 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
TAS5162DKDRG4 功能描述:音频放大器 2x210 W Stereo 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
TAS5176 制造商:TI 制造商全称:Texas Instruments 功能描述:6-Channel, 100-W, Digital-Amplifier Power Stage
TAS5176DDW 功能描述:音频放大器 5.1-CH 100W 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
TAS5176DDW 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC
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