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| 型號： | TAS5342LADDV |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44 |
| 封裝： | PLASTIC, HTSSOP-44 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大?。?/td> | 823K |
| 代理商： | TAS5342LADDV |
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MID Z SEQUENCE COMPATABILITY
DEVICE PROTECTION SYSTEM
ERROR REPORTING
Use of TAS5342LA in High-Modulation-Index
SLAS624 – 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 TAS5342LA 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 TAS5342LA is compatable with the Mid Z
sequence of the TAS5086 Modulator. The Mid Z
The
TAS5342LA
contains
advanced
protection
Sequence is a series of pulses that is generated by
circuitry
carefully
designed
to
facilitate
system
the modulator. This sequence causes the power
integration and ease of use, as well as to safeguard
stage to slowly enable its outputs as it begins to
the device from permanent failure due to a wide
switch.
range of fault conditions such as short circuits,
overload, overtemperature, and undervoltage. The
By slowly starting the PWM switching, the impulse
TAS5342LA responds to a fault by immediately
response created by the onset of switching is
setting the power stage in a high-impedance (Hi-Z)
reduced. This impulse response is the acoustic
state and asserting the SD pin low. In situations other
artifact that is heard in the output transducers
than overload and over-temperature error (OTE), the
(loudspeakers) and is commonly termed "click" or
device
automatically
recovers
when
the
fault
"pop".
condition has been removed, i.e., the supply voltage
has increased.
The low acoustic artifact noise of the TAS5342LA will
be further decreased when used in conjunction with
The device will function on errors, as shown in the
the TAS5086 modulator with the Mid Z Sequence
following table.
enabled.
BTL MODE
PBTL MODE
SE MODE
The Mid Z sequence is primarily used for the
Local
single-ended output configuration. It facilitates a
Error
Turns Off
Error
Turns Off
Error
Turns Off
"softer" PWM output start after the split cap output
In
configuration is charged.
A
A + B
B
A + B + C
+ D
C
C + D
The
SD
and
OTW
pins
are
both
active-low,
D
open-drain
outputs.
Their
function
is
for
protection-mode signaling to a PWM controller or
Bootstrap UVP does not shutdown according to the
other system-control device.
table, it shutsdown the respective halfbridge.
Any fault resulting in device shutdown is signaled by
the SD pin going low. Likewise, OTW goes low when
Capable Systems
the device junction temperature exceeds 125°C (see
the following table).
This device requires at least 30 ns of low time on the
output per 384-kHz PWM frame rate in order to keep
SD
OTW
DESCRIPTION
the bootstrap capacitors charged. As an example, if
0
Overtemperature (OTE) or overload (OLP) or
the modulation index is set to 99.2% in the TAS5508,
undervoltage (UVP)
this setting allows PWM pulse durations down to 10
0
1
Overload (OLP) or undervoltage (UVP)
ns. This signal, which does not meet the 30-ns
1
0
Junction temperature higher than 125°C
requirement, is sent to the PWM_X pin and this
(overtemperature warning)
low-state pulse time does not allow the bootstrap
1
Junction temperature lower than 125°C and no
capacitor to stay charged. The TAS5342LA device
OLP or UVP faults (normal operation)
requires limiting the TAS5508 modulation index to
97.7% to keep the bootstrap capacitor charged under
Note that asserting either RESET_AB or RESET_CD
all signals and loads.
low forces the SD signal high, independent of faults
being present. TI recommends monitoring the OTW
The TAS5342LA contains a bootstrap capacitor under
voltage protection circuit (BST_UVP) that monitors
20
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s) :TAS5342LA
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| TAS5342LADDVR | 功能描述:音頻放大器 100W Stereo Dig Amp Pwr Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5342LDDV | 功能描述:音頻放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5342LDDV6EVM | 功能描述:音頻 IC 開發(fā)工具 TAS5342LDDV6EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TAS5342LDDVG4 | 功能描述:音頻放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5342LDDVR | 功能描述:音頻放大器 100W Class D Stereo Power Stage RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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