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| 型号： | TPA0202PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 35/45页 |
| 文件大小： | 1035K |
| 代理商： | TPA0202PWPG4 |
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TPA0202
2-W STEREO AUDIO POWER AMPLIFIER
SLOS205B – FEBRUARY 1998 – REVISED DECEMBER 2000
40
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
headroom and thermal considerations (continued)
T
A Max + TJ Max * ΘJA PD
+ 150 * 45(0.6
2)
+ 96°C (15 dB headroom, 0 CFM)
(20)
NOTE:
Internal dissipation of 0.6 W is estimated for a 2-W system with 15 dB headroom per channel.
Table 4 shows that for some applications no airflow is required to keep junction temperatures in the specified
range. The TPA0202 is designed with thermal protection that turns the device off when the junction temperature
surpasses 150
°C to prevent damage to the IC. Table 4 was calculated for maximum listening volume without
distortion. When the output level is reduced the numbers in the table change significantly. Also, using 8-
speakers dramatically increases the thermal performance by increasing amplifier efficiency.
junction temperature measurement
Characterizing a PCB layout with respect to thermal impedance is very difficult, as it is usually impossible to
know the junction temperature of the IC in question. The TPA0202 terminal 2 (TJ) sources a current proportional
to the junction temperature. The circuit internal to TJ is shown in Figure 70.
5R
TJ
VDD
R
Figure 70. TJ Terminal Internal Circuit
Connect an ammeter between TJ and ground to measure the current. As the resistors have a tolerance of
±20%,
this measurement must be calibrated on each device. The intent of this function is in characterization of the PCB
and end equipment and not a real-time measurement of temperature. Typically a 25
°C reading is –120 A for
a 3.3-V supply and –135
A for a 5-V supply. The slope is approximately 0.25 A/°C for both VDD = 3.3 V and
VDD = 5 V. To reduce quiescent current, do not ground TJ in normal operation. It can be connected to VDD or
left floating as it has a resistor connected across the base-emitter junction.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA0202PWPR | 功能描述:音频放大器 2W St Aud 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 |
| TPA0202PWPRG4 | 功能描述:音频放大器 2W St Aud 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 |
| TPA0211 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER |
| TPA0211_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER |
| TPA0211DGN | 功能描述:音频放大器 2W Mono 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 |
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