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參數(shù)資料
| 型號： | IRAUDAMP1 |
| 廠商： | International Rectifier |
| 英文描述： | High Power Class D Audio Power Amplifier using IR2011S |
| 中文描述： | 高功率D類音頻功率放大器使用IR2011S |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 3219K |
| 代理商： | IRAUDAMP1 |
Functional Description
Fig. 3 Simplified Block Diagram of Amplifier
Self Oscillating PWM modulator
The IRAUDAMP1 class D audio power amplifier is based on a self oscillating type
PWM modulator for the lowest component count and a robust design. This topology is
basically an analog version of a 2
nd
order sigma delta modulation having a class D
switching stage inside the loop. The benefit of the sigma delta modulation in comparison
to the carrier signal based modulator is that all the error in the audible frequency range is
shifted away into the inaudible upper frequency range by nature of its operation, and it
can apply a sufficient amount of correction. Another important benefit of the self-
oscillating modulator is that it will cease operation if something interrupts the oscillating
sequences. This is generally beneficial in a class D application because it makes the
amplifier more robust.
Looking at CH-1 as an example, OP amp U1 forms a front end 2
nd
order integrator with C17 &
C18. This integrator receives a rectangular waveform from the class D switching stage and
outputs a quadratic oscillatory waveform as a carrier signal. To create the modulated PWM, the
input signal shifts the average value of this quadratic waveform, through R10, so that the duty
varies according to the instantaneous value of the analog input signal. The level shift transistor
Q1 converts the carrier signal from a voltage form into a current form and sends it to the logic
gates sitting on the negative DC bus via the level shift resistor R44, which conerts the signal back
into a voltage form. The signal is then quantized by the threshold of the CMOS inverter gate U2.
The PWM signal out of the inverter is split into two signals, with opposite polarity, one for high
side MOSFET drive signal, the other for the low side MOSFET drive signal. The dual AND gates
of U4 are used to implement the shutdown function, a high shutdown signal will ensure the
outputs of the AND gates are low which in turn ensures the inputs to the gate driver are low.
Integrator
LT1220
Level Shifter
2N5401
Comparator
74HC04
+ V C C
-V C C
++
-VCC
IR2011S
Gate
Driver
IRFB23N15
D
Feed back
GND
LPF
www.irf.com
6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRAUDAMP10 | 功能描述:放大器 IC 開發(fā)工具 Two Channel 300W IRS2052M IRF6775 BRD RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| IRAUDAMP11 | 功能描述:放大器 IC 開發(fā)工具 120W x 3 Ch Class D IRS2053 IRF6665 BRD RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| IRAUDAMP12 | 功能描述:放大器 IC 開發(fā)工具 Two Channel 130W IR4301 40 Ohm BRD RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| IRAUDAMP15 | 功能描述:放大器 IC 開發(fā)工具 Two Channel 35W IR4311 40 Ohm BRD RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| IRAUDAMP16 | 功能描述:放大器 IC 開發(fā)工具 2-Ch 70W 4 Ohm REF Design IR4302 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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