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参数资料
型号： TAS5342ADDVR
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： PLASTIC, HTSSOP-44
文件页数： 13/27页
文件大小： 863K
代理商： TAS5342ADDVR
Mid Z Sequence Compatability
DEVICE PROTECTION SYSTEM
ERROR REPORTING
Use of TAS5342A in High-Modulation-Index
TAS5342A
SLAS623 – NOVEMBER 2008 ........................................................................................................................................................................................... www.ti.com
Characteristics section of this data sheet). Although
signal
using
the
system
microcontroller
and
not specifically required, it is a good practice to hold
responding to an overtemperature warning signal by,
RESET_AB and RESET_CD low during power down,
e.g., turning down the volume to prevent further
thus preventing audible artifacts including pops or
heating of the device resulting in device shutdown
clicks.
(OTE).
When the TAS5342A is being used with TI PWM
To reduce external component count, an internal
modulators
such
as
the
TAS5518,
no
special
pullup resistor to 3.3 V is provided on both SD and
attention to the state of RESET_AB and RESET_CD
OTW outputs. Level compliance for 5-V logic can be
is required, provided that the chipset is configured as
obtained by adding external pullup resistors to 5 V
recommended.
(see the Electrical Characteristics section of this data
sheet for further specifications).
The TAS5342A is compatable with the Mid Z
sequence of the TAS5086 Modulator. The Mid Z
The TAS5342A contains advanced protection circuitry
Sequence is a series of pulses that is generated by
carefully designed to facilitate system integration and
the modulator. This sequence causes the power
ease of use, as well as to safeguard the device from
stage to slowly enable its outputs as it begins to
permanent failure due to a wide range of fault
switch.
conditions
such
as
short
circuits,
overload,
overtemperature, and undervoltage. The TAS5342A
By slowly starting the PWM switching, the impulse
responds to a fault by immediately setting the power
response created by the onset of switching is
stage in a high-impedance (Hi-Z) state and asserting
reduced. This impulse response is the acoustic
the SD pin low. In situations other than overload and
artifact that is heard in the output transducers
over-temperature
error
(OTE),
the
device
(loudspeakers) and is commonly termed "click" or
automatically recovers when the fault condition has
"pop".
been removed, i.e., the supply voltage has increased.
The low acoustic artifact noise of the TAS5342A will
The device will function on errors, as shown in the
be further decreased when used in conjunction with
following table.
the TAS5086 modulator with the Mid Z Sequence
BTL MODE
PBTL MODE
SE MODE
enabled.
Local
The Mid Z sequence is primarily used for the
Error
Turns Off
Error
Turns Off
Error
Turns Off
single-ended output configuration. It facilitates a
In
"softer" PWM output start after the split cap output
A
A + B
configuration is charged.
B
A + B + C
+ D
C
C + D
D
The
SD
and
OTW
pins
are
both
active-low,
open-drain
outputs.
Their
function
is
for
Bootstrap UVP does not shutdown according to the
protection-mode signaling to a PWM controller or
table, it shutsdown the respective halfbridge.
other system-control device.
Any fault resulting in device shutdown is signaled by
Capable Systems
the SD pin going low. Likewise, OTW goes low when
the device junction temperature exceeds 125°C (see
This device requires at least 30 ns of low time on the
the following table).
output per 384-kHz PWM frame rate in order to keep
the bootstrap capacitors charged. As an example, if
SD
OTW
DESCRIPTION
the modulation index is set to 99.2% in the TAS5508,
Overtemperature (OTE) or overload (OLP) or
0
this setting allows PWM pulse durations down to 10
undervoltage (UVP)
ns. This signal, which does not meet the 30-ns
0
1
Overload (OLP) or undervoltage (UVP)
requirement, is sent to the PWM_X pin and this
Junction temperature higher than 125°C
low-state pulse time does not allow the bootstrap
1
0
(overtemperature warning)
capacitor to stay charged. The TAS5342A device
Junction temperature lower than 125°C and no
requires limiting the TAS5508 modulation index to
1
OLP or UVP faults (normal operation)
97.7% to keep the bootstrap capacitor charged under
all signals and loads.
Note that asserting either RESET_AB or RESET_CD
low forces the SD signal high, independent of faults
The TAS5342A contains a bootstrap capacitor under
being present. TI recommends monitoring the OTW
voltage protection circuit (BST_UVP) that monitors
the voltage on the bootstrap capacitors. When the
20
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Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TAS5342A
相关PDF资料
PDF描述
TAS5342ADDV 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5342DDVG4 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5342DDVRG4 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5342DDVR 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5342DDV 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
相关代理商/技术参数
参数描述
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
TAS5342DDVR 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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