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参数资料
| 型号： | TAS5186ADDVR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 60 W, 6 CHANNEL, AUDIO AMPLIFIER, PDSO44 |
| 封装： | GREEN, PLASTIC, HTSSOP-44 |
| 文件页数： | 3/20页 |
| 文件大小： | 609K |
| 代理商： | TAS5186ADDVR |
www.ti.com
THEORY OF OPERATION
POWER SUPPLIES
SYSTEM POWER-UP/DOWN SEQUENCE
Powering Down
Error Reporting
TAS5186A
SLES156 – OCTOBER 2005
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 on the same
To facilitate system design, the TAS5186A needs
side
of
the
PCB
as
the
TAS5186A.
It
is
only a 12-V supply in addition to a typical 39-V
recommended to follow the PCB layout of the
power-stage supply. An internal voltage regulator
TAS5186A
reference
design.
For
additional
provides suitable voltage levels for the digital and
information on the recommended power supply and
low-voltage analog circuitry. Additionally, all circuitry
required components, see the application diagrams
requiring a floating voltage supply, e.g., the high-side
given in this data sheet. The 12-V supply should be
gate drive, is accommodated by built-in bootstrap
powered from a low-noise, low-output-impedance
circuitry requiring only a few external capacitors.
voltage regulator. Likewise, the 39-V power-stage
supply is assumed to have low output impedance and
In order to provide outstanding electrical and acoustic
low noise. The power-supply sequence is not critical
characteristics, the PWM signal path including gate
due to the internal power-on-reset circuit. Moreover,
drive and output stage is designed as identical,
the TAS5186A is fully protected against erroneous
independent half-bridges. For this reason, each
power-stage turnon due to parasitic gate charging.
half-bridge has separate bootstrap pins (BST_X) and
Thus, voltage-supply ramp rates (dv/dt) are typically
power-stage supply pins (PVDD_X). Furthermore, an
noncritical.
additional pin (VDD) is provided as power supply for
all common circuits. Although supplied from the same
12-V source, it is highly recommended to separate
GVDD_X and VDD on the printed-circuit board (PCB)
The
TAS5186A
does
not
require
a
power-up
by RC filters (see application diagram for details).
sequence. The outputs of the H-bridge remain in a
These
RC
filters
provide
the
recommended
high-impedance state until the gate-drive supply
high-frequency isolation. Special attention should be
voltage (GVDD_X) and VDD voltage are above the
paid to placing all decoupling capacitors as close to
undervoltage protection (UVP) voltage threshold (see
their
associated
pins
as
possible.
In
general,
the Electrical Characteristics section of this data
inductance between the power-supply pins and
sheet).
Although
not
specifically
required,
it
is
decoupling
capacitors
must
be
avoided.
(See
recommended to hold RESET in a low state while
reference
board
documentation
for
additional
powering up the device.
information.)
When the TAS5186A is being used with TI PWM
For a properly functioning bootstrap circuit, a small
modulators
such
as
the
TAS5086,
no
special
ceramic capacitor must be connected from each
attention to the state of RESET is required, provided
bootstrap pin (BST_X) to the power-stage output pin
that the chipset is configured as recommended.
(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.
The TAS5186A does not require a power-down
When the power-stage output voltage is high, the
sequence. The device remains fully operational as
bootstrap capacitor voltage is shifted above the
long as the gate-drive supply (GVDD_X) voltage and
output voltage potential and thus provides a suitable
VDD voltage are above the undervoltage protection
voltage supply for the high-side gate driver. In an
(UVP)
threshold
level
(see
the
Electrical
application with PWM switching frequencies in the
Characteristics section of this data sheet). Although
range 352 kHz to 384 kHz, it is recommended to use
not specifically required, it is a good practice to hold
33-nF ceramic capacitors, size 0603 or 0805, for the
RESET low during power down, thus preventing
bootstrap capacitor. These 33-nF capacitors ensure
audible artifacts including pops and clicks
sufficient energy storage, even during minimal PWM
When the TAS5186A is being used with TI PWM
duty cycles, to keep the high-side power stage FET
modulators
such
as
the
TAS5086,
no
special
(LDMOS) fully started during all of the remaining part
attention to the state of RESET is required, provided
of the PWM cycle. In an application running at a
that the chipset is configured as recommended.
reduced switching frequency, generally 250 kHz to
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
The
SD
and
OTW
pins
are
both
active-low,
component selection, PCB placement and routing. As
open-drain
outputs.
Their
function
is
for
indicated,
each
half-bridge
has
independent
protection-mode signaling to a PWM controller or
power-stage supply pins (PVDD_X). For optimal
other system-control device.
electrical performance, EMI compliance, and system
11
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| TAS5186ADDVRG4 | 功能描述:音频放大器 6-Ch 210-W Digital 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 |
| TAS5186DDV | 功能描述:音频放大器 6 CHANNEL 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 |
| TAS5186DDVG4 | 功能描述:音频放大器 6 CHANNEL 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 |
| TAS5186DDVR | 功能描述:音频放大器 6 CHANNEL 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 |
| TAS5186DDVRG4 | 功能描述:音频放大器 6 CHANNEL 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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