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| 型号： | TAS5152DKDG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 240 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | GREEN, PLASTIC, HSSOP-36 |
| 文件页数： | 13/29页 |
| 文件大小： | 681K |
| 代理商： | TAS5152DKDG4 |
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TAS5152
SLES127A FEBRUARY 2005 REVISED NOVEMBER 2005
www.ti.com
20
THEORY OF OPERATION
POWER SUPPLIES
To facilitate system design, the TAS5152 needs only a
12-V supply in addition to the (typically) 35-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.
In order to provide outstanding electrical and acoustical
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 gate drive supply (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 separate
GVDD_A, GVDD_B, GVDD_C, GVDD_D, and VDD on
the printed-circuit board (PCB) by RC filters (see
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 pins as possible. In
general, inductance between the power-supply pins and
decoupling capacitors must be avoided. (See reference
board documentation for additional information.)
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 powerstage 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 capacitor 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 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.
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 ceramic capacitor placed as
close as possible to each supply pin. It is recommended to
follow the PCB layout of the TAS5152 reference design.
For additional information on recommended power supply
and required components, see the application diagrams
given previously in this data sheet.
The
12-V
supply
should
be
from
a
low-noise,
low-output-impedance voltage regulator. Likewise, the
35-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 TAS5152 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).
SYSTEM POWER-UP/POWER-DOWN
SEQUENCE
Powering Up
The TAS5152 does not require a power-up sequence. The
outputs of the Hbridges remain in a high-impedance state
until the gate-drive supply voltage (GVDD_X) and VDD
voltage are above the undervoltage protection (UVP)
voltage threshold (see the
Electrical Characteristics
section of this data sheet). Although not specifically
required, it is recommended 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.
When the TAS5152 is being used with TI PWM modulators
such as the TAS5508, no special attention to the state of
RESET_AB and RESET_CD is required, provided that the
chipset is configured as recommended.
Powering Down
The TAS5152 does not require a power-down sequence.
The device remains fully operational as long as the
gate-drive supply (GVDD_X) voltage and VDD voltage are
above the
undervoltage
protection
(UVP)
voltage
threshold (see the Electrical Characteristics section of this
data sheet). Although not specifically required, it is a good
practice to hold RESET_AB and RESET_CD low during
power down, thus preventing audible artifacts including
pops or clicks.
When the TAS5152 is being used with TI PWM modulators
such as the TAS5508, no special attention to the state of
RESET_AB and RESET_CD is required, provided that the
chipset is configured as recommended.
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| TAS5152DKDR | 240 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5152DKDR | 功能描述:音频放大器 Stereo 125W 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 |
| TAS5152DKDRG4 | 功能描述:音频放大器 Stereo 125W 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 |
| TAS5162 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2*210 Watt STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5162_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2 x 210 Watt STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5162_0705 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2 x 210 Watt STEREO DIGITAL AMPLIFIER POWER STAGE |
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