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参数资料
| 型号： | TAS5261DKDR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 315 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | GREEN, PLASTIC, HSSOP-36 |
| 文件页数： | 8/25页 |
| 文件大小： | 983K |
| 代理商： | TAS5261DKDR |
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THEORY OF OPERATION
Power Supplies
System Power-Up/Power-Down Sequence
Powering Up
Powering Down
SLES188 – AUGUST 2006
PCB placement, and routing. As indicated, each half
bridge has independent power-stage supply pins
(PVDD_x). For optimal electrical performance, EMI
To facilitate system design, the TAS5261 needs only
compliance, and system reliability, it is important that
a
12-V
supply
in
addition
to
a
typical
50-V
each PVDD_x pin is decoupled with two 100-nF
power-stage supply. An internal voltage regulator
ceramic capacitors placed as close as possible to
provides suitable voltage levels for the digital and
each supply pin on the same side of the PCB as the
low-voltage analog circuitry. Additionally, all circuitry
TAS5261 location. It is recommended to follow the
requiring a floating voltage supply, e.g., the high-side
PCB layout of the TAS5261 reference design. For
gate drive, is accommodated by built-in bootstrap
additional information on the recommended power
circuitry requiring only a few external capacitors.
supply and required components, see the application
diagrams given in this data sheet.
To
provide
outstanding
electrical
and
acoustic
characteristics, the PWM signal path, including gate
The
12-V
supply
should
be
powered
from
a
drive and output stage, is designed as identical,
low-noise, low-output-impedance voltage regulator.
independent half bridges. For this reason, each half
Likewise, the 50-V power-stage supply is assumed to
bridge has separated gate-drive supply (GVDD_x),
have low output impedance and low noise. The
bootstrap pins (BST_x) and power-stage supply pins
internal
POR
circuit
eliminates
the
need
for
(PVDD_x). Furthermore, an additional pin (VDD) is
power-supply sequencing. Moreover, the TAS5261 is
provided as power supply for all common circuits.
fully protected against erroneous power-stage turn
Although supplied from the same 12-V source, it is
on
due
to
parasitic
gate
charging.
Thus,
highly recommended to separate GVDD_x and VDD
voltage-supply ramp rates (dv/dt) are noncritical
on the printed circuit board (PCB) by RC filters (see
within the specified range (see the Recommended
application diagram for details). These RC filters
Operating Conditions 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
power-supply pins and decoupling capacitors must
be avoided. (See reference board documentation for
There is no power-up sequence is required for the
additional information.)
TAS5261. The outputs of the H-bridge remain in a
high-impedance state until the gate-drive supply
For a properly functioning bootstrap circuit, a small
voltage (GVDD_x) and VDD voltage are above the
ceramic capacitor must be connected from each
undervoltage protection (UVP) voltage threshold (see
bootstrap pin (BST_x) to the power-stage output pin
the Electrical Characteristics section of this data
(OUT_x). When the power-stage output is low, the
sheet). Although not specifically required, it is
bootstrap capacitor is charged through an internal
recommended to hold RESET in a low state while
diode
connected
between
the
gate-drive
powering up the device. This allows an internal
power-supply pin (GVDD_x) and the bootstrap pin.
circuit to charge the external bootstrap capacitors by
When the power-stage output voltage is high, the
enabling a weak pulldown of the half-bridge output.
bootstrap capacitor voltage is shifted above the
output voltage potential and, thus, provides a
While powering up the TAS5261, RESET should be
suitable voltage supply for the high-side gate driver.
held low.
In an application with PWM switching frequencies in
the range of 352 kHz to 384 kHz, it is recommended
to use 33-nF ceramic capacitors, size 0603 or 0805,
There is no power-down sequence is required for the
for the bootstrap capacitor. These 33-nF capacitors
TAS5261. The device remains fully operational as
ensure
sufficient
energy
storage,
even
during
long as the gate-drive supply (GVDD_x) voltage and
minimal PWM duty cycles, to keep the high-side
VDD voltage are above the undervoltage protection
power-stage FET (LDMOS) fully started during all of
(UVP)
threshold
level
(see
the
Electrical
the remaining part of the PWM cycle. In an
Characteristics section of this data sheet). Although
application running at a reduced switching frequency,
not specifically required, it is a good practice to hold
generally 250 kHz to 192 kHz, the bootstrap
RESET low during power down, thus, preventing
capacitor might need to be increased in value.
audible artifacts including pops and clicks.
Special attention should be paid to the power-stage
power supply – this includes component selection,
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5261DKDRG4 | 功能描述:音频放大器 315-W Mono BTL Dig 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 |
| TAS5342 | 制造商:TI 制造商全称:Texas Instruments 功能描述:100 W STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5342A | 制造商:TI 制造商全称:Texas Instruments 功能描述:100 W STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5342ADDV | 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 |
| TAS5342ADDVR | 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 |
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