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參數資料
| 型號： | TS4990IST |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | LEAD FREE, MSOP-8 |
| 文件頁數： | 10/32頁 |
| 文件大小： | 714K |
| 代理商： | TS4990IST |
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Application information
TS4990
18/32
4
Application information
4.1
BTL configuration principle
The TS4990 is a monolithic power amplifier with a BTL output type. BTL (bridge tied load)
means that each end of the load is connected to two single-ended output amplifiers. Thus,
we have:
Single-ended output 1 = Vout1 = Vout (V)
Single-ended output 2 = Vout2 = -Vout (V)
and Vout1 - Vout2 = 2Vout (V)
The output power is:
For the same power supply voltage, the output power in BTL configuration is four times
higher than the output power in single-ended configuration.
4.2
Gain in a typical application
The typical application schematics are shown in Figure 1 on page 4.
In the flat region (no Cin effect), the output voltage of the first stage is (in Volts):
For the second stage: Vout2 = -Vout1 (V)
The differential output voltage is (in Volts):
The differential gain named gain (Gv) for more convenience is:
Vout2 is in phase with Vin and Vout1 is phased 180° with Vin. This means that the positive
terminal of the loudspeaker should be connected to Vout2 and the negative to Vout1.
4.3
Low and high frequency response
In the low frequency region, Cin starts to have an effect. Cin forms with Rin a high-pass filter
with a -3 dB cut-off frequency. FCL is in Hz.
In the high frequency region, you can limit the bandwidth by adding a capacitor (Cfeed) in
parallel with Rfeed. It forms a low-pass filter with a -3 dB cut-off frequency. FCH is in Hz.
P
out
2V
out
RMS
()
2
R
L
------------------------------
=
V
out1
V
–
in
()
R
feed
R
in
--------------
=
V
out2
V
out1
–
2V
in
R
feed
R
in
--------------
=
G
v
V
out2
V
out1
–
V
in
----------------------------------
2
R
feed
R
in
--------------
==
F
CL
1
2
πR
inCin
------------------------
=
F
CH
1
2
πR
feedCfeed
------------------------------------
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4990JT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1W AUDIO POWER AMPLIFIER WITH ACTIVE LOW STANDBY MODE |
| TS4994 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1W Differential Input/Output Audio Power Amplifier with Selectable Standby |
| TS4994_06 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1W differential input/output audio power amplifier with selectable standby |
| TS4994EIJT | 功能描述:音頻放大器 1.2W input/output Diff Audio Pwr Amp 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 |
| TS4994EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2 W differential input/output audio power amplifier with selectable standby |
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