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參數(shù)資料
| 型號： | IRAUDAMP3 |
| 廠商： | International Rectifier |
| 英文描述： | 120W x 6 Channel Class D Audio Power Amplifier using IRS20124S and IRF6645 |
| 中文描述： | 120瓦× 6通道D類音頻功率放大器使用IRS20124S和IRF6645 |
| 文件頁數(shù)： | 7/40頁 |
| 文件大小： | 3335K |
| 代理商： | IRAUDAMP3 |
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6
Output
All the outputs for the IRAUDAMP3 are single-ended and therefore have terminals
labeled (+) and (-) with the (-) terminal connected to Power Ground. Each channel is
optimized for a 4
speaker load for a maximum output power (120W), but is capable of
operating with higher load impedances, at reduced power, at which point, the frequency
response will have a small peak at the corner frequency of the output LC LPF. The
IRAUDAMP3 is stable with capacitive loading, however, it should be realized that the
frequency response will be degraded by heavy capacitive loading of more than 0.1μF
Gain Setting / Volume Control
The IRAUDAMP3 has an internal volume control (potentiometer R156 labeled
‘VOLUME’) for gain adjustment. Gain settings for all six channels are tracked and
controlled by the volume control IC setting the gain from the micro controller IC, U1. The
maximum volume setting (fully clockwise) corresponds to a total gain of +37.9dB
(78.8V/V). The total gain is a product of the power stage gain, which is a constant
+23.2dB, and the input-stage gain is directly controlled by the volume adjustment. The
volume range is about 100dB with minimum volume setting to ‘mute’ the system with an
overall gain of less than -60dB. For best performance in your testing, the internal volume
control should be set to a gain of 21.9V/V, or 1Vrms input will result in rated output
power (120W into 4
),allowing for a >11dB overdrive.
Self-Oscillating PWM modulator
The IRAUDAMP3 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
second-order sigma-delta modulation having a Class D
switching stage inside the loop. The benefit of 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 the nature of its operation, and
applies a sufficient amount of correction.
The self-oscillating frequency is a determined by the total delay time in the control loop
of the system. The delay of the logic circuits, the IRS20124S gate-driver propagation
delay, the IRF6645 DirectFET MOSFET switching speed, the time constant of the front
end integrator (e.g. R15 + R19, C1 and C2 for Ch-1) and supply-voltages are all critical
factors of the self-oscillating frequency. Under nominal conditions, the switching-
frequency is around 400kHz with no audio input signal.
Adjustments of Self-Oscillating Frequency
The PWM switching frequency in this type of self-oscillating scheme greatly impacts
audio performance, both in absolute frequency and frequency relative to the other
channels. At higher frequencies, distortion due to switching time becomes significant,
while at lower frequencies, the bandwidth of the amplifier suffers. In relative terms,
interference between channels is most significant if the relative frequency difference is
within the audible range. Normally when adjusting the self-oscillating frequency of the
different channels, it is best to either match the frequencies accurately, or have them
separated by at least 25kHz. In this design, it is possible to change the self-oscillating
frequency from about 180kHz up to 470kHz.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRAUDAMP3-DB | 制造商:International Rectifier 功能描述:REFERENCE DESIGN COMPLETE 6-CHANNEL 120W HALF-BRIDGE CLASS D - Bulk |
| IRAUDAMP4 | 功能描述:KIT 2CH 120W HALF BRDG AUDIO AMP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| IRAUDAMP4A | 功能描述:放大器 IC 開發(fā)工具 120W x 2 Ch Class D IRS20957 IRF6645 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 |
| IRAUDAMP5 | 功能描述:放大器 IC 開發(fā)工具 120W x 2 Ch Class D IRS2092S IRF6645 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 |
| IRAUDAMP6 | 制造商:International Rectifier 功能描述:AUDIO REFERENCE DESIGN KIT FEATURING IRS20957 - Boxed Product (Development Kits) 制造商:International Rectifier 功能描述:BOARD EVAL FOR IRS20957S |
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