參數(shù)資料
型號(hào)： TPA4861DG4
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(yè)數(shù)： 8/26頁(yè)
文件大?。?/td> 623K
代理商： TPA4861DG4
www.ti.com
SELECTION OF COMPONENTS
Audio
Input
Bias
Control
VDD = 5 V
1-W
Internal
Speaker
6
5
8
7
VO1
VO2
VDD
1
2
3
4
IN +
IN
BYPASS
SHUTDOWN (see Note A)
VDD/2
CI
RI
RF
CF
50 k
50 k
46 k
46 k
CB
CS
NOTE A: SHUTDOWN must be held low for normal operation and asserted high for shutdown mode.
+
+
Gain Setting Resistors, RF and RI
Gain + * 2
R
F
R
I
(5)
Effective Impedance +
R
FRI
R
F ) RI
(6)
TPA4861
SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004
Figure 37 is a schematic diagram of a typical notebook computer application circuit.
Figure 37. TPA4861 Typical Notebook Computer Application Circuit
The gain for the TPA4861 is set by resistors RF and RI according to Equation 5.
BTL mode operation brings about the factor of 2 in the gain equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the TPA4861 is a MOS amplifier, the input impedance is high;
consequently, input leakage currents are not generally a concern, although noise in the circuit increases as the
value of RF increases. In addition, a certain range of RF values are required for proper start-up operation of the
amplifier. Taken together, it is recommended that the effective impedance seen by the inverting node of the
amplifier be set between 5 k
and 20 k. The effective impedance is calculated in Equation 6.
As an example, consider an input resistance of 10 k
and a feedback resistor of 50 k. The gain of the amplifier
would be –10 V/V, and the effective impedance at the inverting terminal would be 8.3 k
, which is well within the
recommended range.
For high-performance applications, metal film resistors are recommended because they tend to have lower noise
levels than carbon resistors. For values of RF above 50 k, the amplifier tends to become unstable due to a pole
formed from RF and the inherent input capacitance of the MOS input structure. For this reason, a small
compensation capacitor of approximately 5 pF should be placed in parallel with RF. This, in effect, creates a
low-pass filter network with the cutoff frequency defined in Equation 7.
16
相關(guān)PDF資料
PDF描述
TPA4861DRG4 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA4861Y 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC8
TPA5050RSARG4 SPECIALTY CONSUMER CIRCUIT, PQCC16
TPA5050RSAR SPECIALTY CONSUMER CIRCUIT, PQCC16
TPA5050RSATG4 SPECIALTY CONSUMER CIRCUIT, PQCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA4861DR 功能描述:音頻放大器 1-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA4861DRG4 功能描述:音頻放大器 1-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA-5 功能描述:保險(xiǎn)絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險(xiǎn)絲類型:Fast Acting 保險(xiǎn)絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*