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參數資料
| 型號： | TPA4861DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 11/26頁 |
| 文件大?。?/td> | 623K |
| 代理商： | TPA4861DR |
www.ti.com
SHUTDOWN MODE
USING LOW-ESR CAPACITORS
THERMAL CONSIDERATIONS
160
40
20
0
0.25
1.5
0.5
0.75
1
–
Free-Air
T
emperature
–
PO – Maximum Output Power – W
1.25
C
°
T A
80
60
120
100
140
RL = 16
RL = 8
VDD = 5 V
TPA4861
SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004
Table 2. Common Load Impedances vs Low-Frequency
Output Characteristics in SE Mode
RL
CC
LOWEST FREQUENCY
8
68 F
293 Hz
32
68 F
73 Hz
47,000
68 F
0.05 Hz
As Table 2 indicates, most of the bass response is attenuated into 8-
loads, while headphone response is
adequate and drive into line level inputs (a home stereo for example) is good.
The TPA4861 employs a shutdown mode of operation designed to reduce supply current, IDD(q), to the absolute
minimum level during periods of nonuse for battery-power conservation. For example, during device sleep modes
or when other audio-drive currents are used (i.e., headphone mode), the speaker drive is not required. The
SHUTDOWN input terminal should be held low during normal operation when the amplifier is in use. Pulling
SHUTDOWN high causes the outputs to mute and the amplifier to enter a low-current state, IDD(SD) ~ 0.6 A.
SHUTDOWN should never be left unconnected because amplifier operation would be unpredictable.
Low-ESR capacitors are recommended throughout this applications section. A real 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.
A prime consideration when designing an audio amplifier circuit is internal power dissipation in the device. The
curve in Figure 39 provides an easy way to determine what output power can be expected out of the TPA4861
for a given system ambient temperature in designs using 5-V supplies. This curve assumes no forced airflow or
additional heat sinking.
Figure 39. Free-Air Temperature vs Maximum Continuous Output Power
19
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相關代理商/技術參數 |
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|---|---|
| TPA4861DRG4 | 功能描述:音頻放大器 1-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA-5 | 功能描述:保險絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險絲類型:Fast Acting 保險絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風格: 端接類型:SMD/SMT 系列:485 |
| TPA-5,0-ADV | 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 18 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact;RoHS Compliant: NA |
| TPA-5,0-BAS | 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 4 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact ;RoHS Compliant: NA |
| TPA-5,0-L-BAS | 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0-L 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0-L; Kit Contents:Probe Kit, 4 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact ;RoHS Compliant: NA |
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