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参数资料
| 型号： | TS4974IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, DSO10 |
| 封装： | 3 X 3 MM, 0.50 MM PITCH, ROHS COMPLIANT, DFN-10 |
| 文件页数： | 10/25页 |
| 文件大小： | 319K |
| 代理商： | TS4974IQT |
Application information
TS4974
18/25
and the maximum value is obtained when:
and its value is:
Equation 3
Note:
This maximum value is only dependent on the power supply voltage and load
values.
The efficiency is the ratio between the output power and the power supply:
Equation 4
The maximum theoretical value is reached when Vpeak = VCC, so:
The maximum die temperature allowable for the TS4974 is 125°C. However, in case of
overheating, a thermal shutdown set to 150° C, puts the TS4974 in standby until the
temperature of the die is reduced by about 5° C.
To calculate the maximum ambient temperature Tamb allowable, you need to know:
●
Power supply voltage value, VCC
●
Load resistor value, RL
●
The package type, RTHJA
Example: VCC=5 V, RL=8 Ω, RTHJAflip-chip=80° C/W (125 mm
2 copper heatsink).
Using the power dissipation formula given above in Equation 3 this gives a result of:
Pdissmax = 633mW
Tamb is calculated as follows:
Equation 5
Therefore, the maximum allowable value for Tamb is:
Tamb = 125-80x0.633 = 74.3°C
Pdiss
P
out
--------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
π
=
η=
P
out
P
supply
------------------- =
πV
peak
4V
CC
--------------------
η= π
4
----- = 78.5%
T
amb
125
° CR
TJHA
P
dissmax
×
–
=
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相关代理商/技术参数 |
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|---|---|
| TS4975 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Stereo Headphone Drive Amplifier with Digital Volume Control via I2C Bus |
| TS4975_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Stereo Headphone Drive Amplifier with Digital Volume Control via I2C Bus |
| TS4975EIJT | 功能描述:音频放大器 Stereo headphone 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 |
| TS4982IQT | 功能描述:音频放大器 2W Stereo Audio Amp 125 mW 16 ohm 3 lvl 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 |
| TS4984 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
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