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参数资料
型号： TAS5142DDVRG4
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： GREEN, PLASTIC, HTSSOP-44
文件页数： 13/31页
文件大小： 942K
代理商： TAS5142DDVRG4
www.ti.com
THEORY OF OPERATION
POWER SUPPLIES
SYSTEM POWER-UP/POWER-DOWN
Powering Up
Powering Down
TAS5142
SLES126B – DECEMBER 2004 – REVISED MAY 2005
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 TAS5142 needs only
half-bridge has independent power-stage supply pins
a 12-V supply in addition to the (typical) 32-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
TAS5142
reference
design.
For
circuitry requiring only a few external capacitors.
additional information on recommended power supply
In
order
to
provide
outstanding
electrical
and
required
components,
see
the
application
acoustical characteristics, the PWM signal path
diagrams given previously in this data sheet.
including gate drive and output stage is designed as
The 12-V supply should be from a low-noise,
identical, independent half-bridges. For this reason,
low-output-impedance voltage regulator. Likewise, the
each half-bridge has separate gate drive supply
32-V power-stage supply is assumed to have low
(GVDD_X), bootstrap pins (BST_X), and power-stage
output impedance and low noise. The power-supply
supply pins (PVDD_X). Furthermore, an additional pin
sequence is not critical as facilitated by the internal
(VDD) is provided as supply for all common circuits.
power-on-reset circuit. Moreover, the TAS5142 is fully
Although supplied from the same 12-V source, it is
protected against erroneous power-stage turnon due
highly
recommended
to
separate
GVDD_A,
to parasitic gate charging. Thus, voltage-supply ramp
GVDD_B, GVDD_C, GVDD_D, and VDD on the
rates (dV/dt) are non-critical within the specified
printed-circuit
board
(PCB)
by
RC
filters
(see
range (see the Recommended Operating Conditions
application diagram for details). These RC filters
section of this data sheet).
provide the recommended high-frequency isolation.
Special attention should be paid to placing all
decoupling capacitors as close to their associated
pins as possible. In general, inductance between the
SEQUENCE
power supply pins and decoupling capacitors must be
avoided. (See reference board documentation for
additional information.)
The TAS5142 does not require a power-up sequence.
For a properly functioning bootstrap circuit, a small
The outputs of the H-bridges remain in a high-imped-
ceramic capacitor must be connected from each
ance
state
until
the
gate-drive
supply
voltage
bootstrap pin (BST_X) to the power-stage output pin
(GVDD_X)
and
VDD
voltage
are
above
the
(OUT_X). When the power-stage output is low, the
undervoltage protection (UVP) voltage threshold (see
bootstrap capacitor is charged through an internal
the Electrical Characteristics section of this data
diode connected between the gate-drive power--
sheet).
Although
not
specifically
required,
it
is
supply pin (GVDD_X) and the bootstrap pin. When
recommended to hold RESET_AB and RESET_CD in
the
power-stage
output
is
high,
the
bootstrap
a low state while powering up the device. This allows
capacitor
potential
is
shifted
above
the
output
an internal circuit to charge the external bootstrap
potential and thus provides a suitable voltage supply
capacitors by enabling a weak pulldown of the
for the high-side gate driver. In an application with
half-bridge output.
PWM switching frequencies in the range from 352
When the TAS5142 is being used with TI PWM
kHz to 384 kHz, it is recommended to use 33-nF
modulators
such
as
the
TAS5508,
no
special
ceramic capacitors, size 0603 or 0805, for the
attention to the state of RESET_AB and RESET_CD
bootstrap supply. These 33-nF capacitors ensure
is required, provided that the chipset is configured as
sufficient energy storage, even during minimal PWM
recommended.
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
reduced switching frequency, generally 192 kHz, the
The TAS5142 does not require a power-down
bootstrap capacitor might need to be increased in
sequence. The device remains fully operational as
value.
long as the gate-drive supply (GVDD_X) voltage and
VDD voltage are above the undervoltage protection
(UVP)
voltage
threshold
(see
the
Electrical
20
相关PDF资料
PDF描述
TAS5142DDVR 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO44
TAS5142DKDG4 200 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TAS5152DKDRG4 240 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TAS5152DKDG4 240 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TAS5152DKDR 240 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
相关代理商/技术参数
参数描述
TAS5142DKD 功能描述:音频放大器 Stereo 100W Powerstage 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
TAS5142DKD 制造商:Texas Instruments 功能描述:IC AMP AUDIO PWR 100W D 36SSOP 制造商:Texas Instruments 功能描述:IC, AMP AUDIO PWR 100W D 36SSOP 制造商:Texas Instruments 功能描述:IC, AMP AUDIO PWR 100W D 36SSOP; Amplifier Class:D; No. of Channels:2; Output Power:100W; Supply Voltage Range:0V to 34V, 10.8V to 13.2V; Amplifier Case Style:HSSOP; No. of Pins:36; Load Impedance:2ohm; Operating Temperature Min:0C;;RoHS Compliant: Yes
TAS5142DKDG4 功能描述:音频放大器 Stereo 100W Powerstage 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
TAS5142DKDR 功能描述:音频放大器 Stereo 100W Powerstage 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
TAS5142DKDRG4 功能描述:音频放大器 Stereo 100W Powerstage 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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