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参数资料
| 型号： | TS4985 |
| 厂商： | 意法半导体 |
| 英文描述： | 2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| 中文描述： | 2x1.2w立体声音频功率放大器专用待机销 |
| 文件页数： | 22/29页 |
| 文件大小： | 1798K |
| 代理商： | TS4985 |
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Application Information
TS4985
22/29
Due to process tolerances, the maximum value of wake-up time could be establish by the graph
in
Figure 64
.
Note:
Bypass capacitor C
b
as also a tolerance of typically +/-20%. To calculate the wake-up time with
this tolerance, refer to the previous graph (considering for example for C
b
= 1μF in the range of
0.8μF
≤
1μF
≤
1.2μF).
4.7
Shutdown time
When the standby command is set, the time required to put the two output stages in high
impedance and the internal circuitry in shutdown mode is a few microseconds.
Note:
In shutdown mode, Bypass pin and Vin- pin are short-circuited to ground by internal switches.
This allows for the quick discharge of the C
b
and C
in
capacitors.
4.8
Pop performance
Pop performance is intimately linked with the size of the input capacitor C
in
and the bias voltage
bypass capacitor C
b
.
The size of C
in
is dependent on the lower cut-off frequency and PSRR values requested. The
size of C
b
is dependent on THD+N and PSRR values requested at lower frequencies.
Moreover, C
b
determines the speed with which the amplifier turns ON. In order to reach near
zero pop and click, the equivalent input constant time is:
τ
in
= (Rin + 2k
) x C
in
(s) with R
in
≥
5k
must not reach the
τ
in
maximum value as indicated in the graph below in
Figure 65
.
Figure 63. Typical wake-up time vs. C
b
Figure 64. Maximum wake-up time vs. C
b
1
2
3
4
0
100
200
300
400
500
600
4.7
0.1
Tamb=25
°
C
Vcc=2.6V
Vcc=3.3V
Vcc=5V
S
Bypass Capacitor Cb ( F)
1
2
3
4
0
100
200
300
400
500
600
Tamb=25
°
C
4.7
0.1
Vcc=5V
Vcc=3.3V
Vcc=2.6V
M
Bypass Capacitor Cb ( F)
相关PDF资料 |
PDF描述 |
|---|---|
| TS4985EIJT | 2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EIKJT | 2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EKIJT | 2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4990 | 1W AUDIO POWER AMPLIFIER WITH ACTIVE LOW STANDBY MODE |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4985EIJT | 功能描述:音频放大器 2x1.2W stereo audio 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 |
| TS4985EIKJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EKIJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4990 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1W AUDIO POWER AMPLIFIER WITH ACTIVE LOW STANDBY MODE |
| TS4990_08 | 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 |
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