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参数资料
| 型号： | TS4990EIKJT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封装： | ROHS COMPLIANT, FCP-9 |
| 文件页数： | 15/32页 |
| 文件大小： | 797K |
| 代理商： | TS4990EIKJT |
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Application information
TS4990
22/31
The size of Cin is dependent on the lower cut-off frequency and PSRR values requested.
The size of Cb is dependent on THD+N and PSRR values requested at lower frequencies.
Moreover, Cb determines the speed with which the amplifier turns ON. In order to reach
near zero pop & click, the equivalent input constant time,
τ in = (Rin + 2kΩ)xCin (s) with Rin ≥ 5kΩ
must not reach the
Figure 63.
τ in max. versus bypass capacitor
By following the previous rules, the TS4990 can reach near zero pop and click even with
high gains such as 20 dB.
Example:
With Rin =22kΩ and a 20 Hz, -3 dB low cut-off frequency, Cin =361 nF. So, Cin =390 nF
with standard value which gives a lower cut-off frequency equal to 18.5 Hz. In this case,
(Rin +2kΩ)xCin = 9.36ms. By referring to the previous graph, if Cb = 1 F and VCC =5V,
we read 20 ms max. This value is twice as high as our current value, thus we can state that
pop & click will be reduced to its lowest value.
Minimizing both Cin and the gain benefits both the pop phenomena, and the cost and size of
the application.
4.9
Application example: differential input, BTL power amplifier
The schematics in Figure 64 show how to configure the TS4990 to work in differential input
mode.
The gain of the amplifier is:
In order to reach the best performance of the differential function, R1 and R2 should be
matched at 1% max.
12
34
0
40
80
120
160
Vcc=5V
Vcc=3.3V
Vcc=2.6V
Tamb=25
°C
in
m
ax.
(m
s)
Bypass Capacitor Cb ( F)
G
VDIFF
2
R
2
R
1
-------
=
相关PDF资料 |
PDF描述 |
|---|---|
| TS4990EKIJT | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| TS4990EIJT | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| TS4990IST | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4990IQT | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8 |
| TS4990IJT | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4990EKIJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2 W audio power amplifier with active low standby mode |
| TS4990ID | 功能描述:音频放大器 1.2W audio Pwr amp 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 |
| TS4990IDT | 功能描述:音频放大器 1.2W audio Pwr amp 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 |
| TS4990IJT | 制造商:ST 功能描述:1W AUDIO POWER AMPLIFIER WITH ACTIVE LOW STANDBY MODE |
| TS4990IQT | 功能描述:音频放大器 1.2W audio pow. amp. 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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