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参数资料
型号： TAS5342LADDV
厂商： TEXAS INSTRUMENTS INC
元件分类： 音频／视频放大
英文描述： 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
封装： PLASTIC, HTSSOP-44
文件页数： 11/27页
文件大小： 823K
代理商： TAS5342LADDV
THEORY OF OPERATION
POWER SUPPLIES
SYSTEM POWER-UP/POWER-DOWN
Powering Up
Powering Down
TAS5342LA
www.ti.com ........................................................................................................................................................................................... SLAS624 – NOVEMBER 2008
Special attention should be paid to the power-stage
power supply; this includes component selection,
PCB placement, and routing. As indicated, each
To facilitate system design, the TAS5342LA needs
half-bridge has independent power-stage supply pins
only a 12-V supply in addition to the (typical) 32.0-V
(PVDD_X). For optimal electrical performance, EMI
power-stage supply. An internal voltage regulator
compliance, and system reliability, it is important that
provides suitable voltage levels for the digital and
each PVDD_X pin is decoupled with a 100-nF
low-voltage analog circuitry. Additionally, all circuitry
ceramic capacitor placed as close as possible to
requiring a floating voltage supply, e.g., the high-side
each supply pin. It is recommended to follow the PCB
gate drive, is accommodated by built-in bootstrap
layout of the TAS5342LA reference design. For
circuitry requiring only an external capacitor for each
additional information on recommended power supply
half-bridge.
and
required
components,
see
the
application
In
order
to
provide
outstanding
electrical
and
diagrams given previously in this data sheet.
acoustical characteristics, the PWM signal path
The 12-V supply should be from a low-noise,
including gate drive and output stage is designed as
low-output-impedance voltage regulator. Likewise, the
identical, independent half-bridges. For this reason,
32.0 V power-stage supply is assumed to have low
each half-bridge has separate gate drive supply
output impedance and low noise. The power-supply
(GVDD_X), bootstrap pins (BST_X), and power-stage
sequence is not critical as facilitated by the internal
supply pins (PVDD_X). Furthermore, an additional pin
power-on-reset circuit. Moreover, the TAS5342LA is
(VDD) is provided as supply for all common circuits.
fully protected against erroneous power-stage turnon
Although supplied from the same 12-V source, it is
due to parasitic gate charging. Thus, voltage-supply
highly
recommended
to
separate
GVDD_A,
ramp rates (dV/dt) are non-critical within the specified
GVDD_B, GVDD_C, GVDD_D, and VDD on the
range (see the Recommended Operating Conditions
printed-circuit
board
(PCB)
by
RC
filters
(see
section of this data sheet).
application diagram for details). These RC filters
provide the recommended high-frequency isolation.
Special attention should be paid to placing all
decoupling capacitors as close to their associated
SEQUENCE
pins as possible. In general, inductance between the
power supply pins and decoupling capacitors must be
avoided. (See reference board documentation for
The TAS5342LA does not require a power-up
additional information.)
sequence. The outputs of the H-bridges remain in a
For a properly functioning bootstrap circuit, a small
high-impedance state until the gate-drive supply
ceramic capacitor must be connected from each
voltage (GVDD_X) and VDD voltage are above the
bootstrap pin (BST_X) to the power-stage output pin
undervoltage protection (UVP) voltage threshold (see
(OUT_X). When the power-stage output is low, the
the Electrical Characteristics section of this data
bootstrap capacitor is charged through an internal
sheet).
Although
not
specifically
required,
it
is
diode connected between the gate-drive power--
recommended to hold RESET_AB and RESET_CD in
supply pin (GVDD_X) and the bootstrap pin. When
a low state while powering up the device. This allows
the
power-stage
output
is
high,
the
bootstrap
an internal circuit to charge the external bootstrap
capacitor
potential
is
shifted
above
the
output
capacitors by enabling a weak pulldown of the
potential and thus provides a suitable voltage supply
half-bridge output.
for the high-side gate driver. In an application with
When the TAS5342LA is being used with TI PWM
PWM switching frequencies in the range from 352
modulators
such
as
the
TAS5518,
no
special
kHz to 384 kHz, it is recommended to use 33-nF
attention to the state of RESET_AB and RESET_CD
ceramic capacitors, size 0603 or 0805, for the
is required, provided that the chipset is configured as
bootstrap supply. These 33-nF capacitors ensure
recommended.
sufficient energy storage, even during minimal PWM
duty cycles, to keep the high-side power stage FET
(LDMOS) fully turned on during the remaining part of
the PWM cycle. In an application running at a
The TAS5342LA does not require a power-down
reduced switching frequency, generally 192 kHz, the
sequence. The device remains fully operational as
bootstrap capacitor might need to be increased in
long as the gate-drive supply (GVDD_X) voltage and
value.
VDD voltage are above the undervoltage protection
(UVP)
voltage
threshold
(see
the
Electrical
Copyright 2008, Texas Instruments Incorporated
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Product Folder Link(s) :TAS5342LA
相关PDF资料
PDF描述
TAS5342LDDVG4 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5342LDDVRG4 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
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相关代理商/技术参数
参数描述
TAS5342LADDVR 功能描述:音频放大器 100W Stereo 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
TAS5342LDDV 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
TAS5342LDDV6EVM 功能描述:音频 IC 开发工具 TAS5342LDDV6EVM 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
TAS5342LDDVG4 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
TAS5342LDDVR 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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