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參數(shù)資料
| 型號： | TAS5146DKD |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | STEREO DIGITAL AMPLIFIER POWER STAGE |
| 中文描述： | 立體聲數(shù)字放大器功率級 |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 583K |
| 代理商： | TAS5146DKD |
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THEORY OF OPERATION
POWER SUPPLIES
To facilitate system design, the TAS5142 needs only
a 12-V supply in addition to the (typical) 32-V
power-stage supply. An internal voltage regulator
provides suitable voltage levels for the digital and
low-voltage analog circuitry. Additionally, all circuitry
requiring a floating voltage supply, e.g., the high-side
gate drive, is accommodated by built-in bootstrap
circuitry requiring only a few external capacitors.
SYSTEM POWER-UP/POWER-DOWN
SEQUENCE
Powering Up
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
half-bridge has independent power-stage supply pins
(PVDD_X). For optimal electrical performance, EMI
compliance, and system reliability, it is important that
each PVDD_X pin is decoupled with a 100-nF cer-
amic capacitor placed as close as possible to each
supply pin. It is recommended to follow the PCB
layout of the TAS5142 reference design. For ad-
ditional information on recommended power supply
and required components, see the application dia-
grams given previously in this data sheet.
In order to provide outstanding electrical and acousti-
cal characteristics, the PWM signal path including
gate drive and output stage is designed as identical,
independent half-bridges. For this reason, each
half-bridge
has
separate
(GVDD_X), bootstrap pins (BST_X), and power-stage
supply pins (PVDD_X). Furthermore, an additional pin
(VDD) is provided as supply for all common circuits.
Although supplied from the same 12-V source, it is
highly
recommended
to
GVDD_B, GVDD_C, GVDD_D, and VDD on the
printed-circuit board (PCB) by RC filters (see appli-
cation 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 pins as poss-
ible. In general, inductance between the power supply
pins and decoupling capacitors must be avoided.
(See reference board documentation for additional
information.)
The 12-V supply should be from a low-noise,
low-output-impedance voltage regulator. Likewise, the
32-V power-stage supply is assumed to have low
output impedance and low noise. The power-supply
sequence is not critical as facilitated by the internal
power-on-reset circuit. Moreover, the TAS5142 is fully
protected against erroneous power-stage turnon due
to parasitic gate charging. Thus, voltage-supply ramp
rates (dV/dt) are non-critical within the specified
range (see the
Recommended Operating Conditions
section of this data sheet).
gate
drive
supply
separate
GVDD_A,
The TAS5142 does not require a power-up sequence.
The outputs of the H-bridges remain in a high-imped-
ance
state
until
the
gate-drive
(GVDD_X)
and
VDD
voltage
undervoltage protection (UVP) voltage threshold (see
the
Electrical Characteristics
section of this data
sheet). Although not specifically required, it is rec-
ommended to hold RESET_AB and RESET_CD in a
low state while powering up the device. This allows
an internal circuit to charge the external bootstrap
capacitors by enabling a weak pulldown of the
half-bridge output.
For a properly functioning bootstrap circuit, a small
ceramic capacitor must be connected from each
bootstrap pin (BST_X) to the power-stage output pin
(OUT_X). When the power-stage output is low, the
bootstrap capacitor is charged through an internal
diode connected between the gate-drive power-
-
supply pin (GVDD_X) and the bootstrap pin. When
the power-stage output is high, the bootstrap capaci-
tor potential is shifted above the output potential and
thus provides a suitable voltage supply for the
high-side gate driver. In an application with PWM
switching frequencies in the range from 352 kHz to
384 kHz, it is recommended to use 33-nF ceramic
capacitors, size 0603 or 0805, for the bootstrap
supply. These 33-nF capacitors ensure 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
reduced switching frequency, generally 192 kHz, the
bootstrap capacitor might need to be increased in
value.
supply
are
voltage
above
the
When the TAS5142 is being used with TI PWM
modulators such as the TAS5508, no special atten-
tion to the state of RESET_AB and RESET_CD is
required, provided that the chipset is configured as
recommended.
20
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| TAS5152 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5152_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5152DKD | 功能描述:音頻放大器 Stereo 125W Powerstage 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 |
| TAS5152DKD | 制造商:Texas Instruments 功能描述:Special Function IC |
| TAS5152DKDG4 | 功能描述:音頻放大器 Stereo 125W Powerstage 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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