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参数资料
| 型号： | TS4984IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16 |
| 封装： | 4 X 4 MM, 0.50 MM PITCH, LEAD FREE, TQFN-16 |
| 文件页数： | 16/29页 |
| 文件大小： | 901K |
| 代理商： | TS4984IQT |
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Application Information
TS4984
23/29
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 Cb and Cin capacitors.
4.8 Pop performance
Pop performance is intimately linked with the size of the input capacitor Cin and the bias voltage bypass
capacitor Cb.
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
and click, the equivalent input constant time is:
tin =(Rin+2 k)x Cin (s) with Rin ≥ 5k
must not reach the
By following previous rules, the TS4984 can reach near zero pop and click even with high gains such as
20 dB.
Example calculation
With Rin =22k 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 +2 k)x Cin =9.36ms.
When referring to the previous graph, if Cb =1 F and Vcc = 5 V, we read 20 ms max. This value is twice
as high as our current value, thus we can state that pop and 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.
Figure 68:
τin max. versus bypass capacitor
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)
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相关代理商/技术参数 |
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| TS4985 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
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| 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 |
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