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參數(shù)資料
| 型號： | TMPA420DS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 15W/Ch STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 15W/Ch立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大小： | 348K |
| 代理商： | TMPA420DS |
Preliminary
www.taimec.com.tw
/
www.class-d.com.tw
TMPA420DS
Rev.3.0 August 15, 2007
t
ai'mec
DETAILED DESCRIPTION
Efficiency
The output transistors of a class D amplifier act as switches. The power loss is mainly due to
the turn on resistance of the output transistors when driving current to the load. As the turn on
resistance is so small that the power loss is small and the power efficiency is high. With 8 ohm
load the power efficiency can be better than 80%.
PCB layout for power dissipation
No heat sink is necessary for power dissipation. However the PCB layout should be well
designed to dissipate heat for high output power. With 80% power efficiency the generated
heat when driving 15 watts to the 8 ohm load is about 3.75 watts. The heat can be carried out
through the thermal pad of the device to the PCB. To ensure proper dissipation of heat the
PCB has to have heat path from the bottom of the device which is soldered to the PCB. The
area of the metal on the PCB for heat dissipation should be big enough. It is suggested that
both sides of the PCB are used for power dissipation.
Shutdown
The shutdown mode reduces power consumption. A LOW at shutdown pin forces the device in
shutdown mode and a HIGH forces the device in normal operating mode. Shutdown mode is
useful for power saving when not in use. This function is useful when other devices like
earphone amplifier on the same PCB are used but class D amplifier is not necessary.
Internal circuit for shutdown is shown below.
Copyright
2005,Tai-1 Microelectronics Corp.
7
HFRC
HFRC provides a way of soft start up delay. A half_Vcc voltage detector is integrated to detect
a RC charge up. The resistor of 320k ohms of the RC circuit is also integrated in the chip but
the capacitor is externally hooked up. For C=1uF the half_Vcc delay is
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相關(guān)代理商/技術(shù)參數(shù) |
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| TMPA421DS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:15W + 6W x2 2.1 Channel CLASS-D AUDIO POWER AMPLIFIER |
| TMPA8700CHF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| TMPA8700CHN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| TMPA8700CKF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| TMPA8700CKN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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