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參數(shù)資料
| 型號： | TAS5342DDVRG4 |
| 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： | GREEN, PLASTIC, HTSSOP-44 |
| 文件頁數(shù)： | 14/29頁 |
| 文件大?。?/td> | 866K |
| 代理商： | TAS5342DDVRG4 |
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www.ti.com
Mid Z Sequence Compatability
DEVICE PROTECTION SYSTEM
ERROR REPORTING
Use of TAS5342 in High-Modulation-Index
SLAS557B – SEPTEMBER 2007 – REVISED OCTOBER 2007
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 TAS5342 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 TAS5342 is compatable with the Mid Z sequence
of the TAS5086 Modulator. The Mid Z Sequence is a
The TAS5342 contains advanced protection circuitry
series of pulses that is generated by the modulator.
carefully designed to facilitate system integration and
This sequence causes the power stage to slowly
ease of use, as well as to safeguard the device from
enable its outputs as it begins to switch.
permanent failure due to a wide range of fault
conditions
such
as
short
circuits,
overload,
By slowly starting the PWM switching, the impulse
overtemperature, and undervoltage. The TAS5342
response created by the onset of switching is
responds to a fault by immediately setting the power
reduced. This impulse response is the acoustic
stage in a high-impedance (Hi-Z) state and asserting
artifact that is heard in the output transducers
the SD pin low. In situations other than overload and
(loudspeakers) and is commonly termed "click" or
over-temperature
error
(OTE),
the
device
"pop".
automatically recovers when the fault condition has
been removed, i.e., the supply voltage has increased.
The low acoustic artifact noise of the TAS5342 will be
further decreased when used in conjunction with the
The device will function on errors, as shown in 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
Overtemperature (OTE) or overload (OLP) or
0
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
Junction temperature higher than 125
°C
requirement, is sent to the PWM_X pin and this
1
0
(overtemperature warning)
low-state pulse time does not allow the bootstrap
Junction temperature lower than 125
°C and no
capacitor to stay charged. The TAS5342 device
1
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 TAS5342 contains a bootstrap capacitor under
voltage protection circuit (BST_UVP) that monitors
the voltage on the bootstrap capacitors. When the
Copyright 2007, Texas Instruments Incorporated
21
Product Folder Link(s): TAS5342
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TAS5342L | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100 W STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5342LA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100 W STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5342LAADDVR | 制造商:Texas Instruments 功能描述:Class D Amplifier |
| TAS5342LADDV | 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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