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參數(shù)資料
| 型號(hào)： | TPA3000D1 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 17-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 17單聲道無濾波器D類音頻功率放大器 |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 273K |
| 代理商： | TPA3000D1 |
TPA3000D1
SLOS379A
–
SEPTEMBER 2001
–
REVISED JANUARY 2002
17
www.ti.com
,APPLICATION INFORMATION
SHUTDOWN operation
The TPA3000D1 employs a shutdown mode of operation designed to reduce supply current (I
CC
) to the absolute
minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal
should be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the
outputs to mute and the amplifier to enter a low-current state, I
CC(SD)
= 1
μ
A. SHUTDOWN should never be left
unconnected, because amplifier operation would be unpredictable.
Ideally, the device should be held in shutdown when the system powers up and brought out of shutdown once
any digital circuitry has settled. However, if SHUTDOWN is to be left unused or if the device is to be powered
up with SHUTDOWN held high, the circuit below should be used.
CSD
0.1
μ
F
SHUTDOWN
Pin 23
R(SD)
120 k
VCC (or SHUTDOWN Control Signal, TTL Compatible)
The values for R
SD
and C
SD
should be chosen for a time constant (
τ
= R
SD
C
SD
) of at least 10 ms for proper
operation. The maximum output current of the SHUTDOWN control signal source must not be exceeded.
using low-ESR capacitors
Low-ESR capacitors are recommended throughout this application section. A real (as opposed to ideal)
capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this
resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this
resistance the more the real capacitor behaves like an ideal capacitor.
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