參數(shù)資料
型號(hào)： 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(lèi)音頻功率放大器使用IRS20124S和IRF6645
文件頁(yè)數(shù)： 6/40頁(yè)
文件大?。?/td> 3335K
代理商： IRAUDAMP3
www.irf.com
5
Power Supplies
The IRAUDAMP3 has all the necessary housekeeping power supplies onboard and only
requires a pair of symmetric dual power supplies ranging from ±25V to ±35V (+B, GND, -
B) for operation. The internally generated housekeeping power supplies include a ±5V
supply for signal processing, while a +12V supply, referenced to –B, is included to
supply the Class D gate driver stage.
For the externally applied power, a regulated power supply is preferable for performance
measurements, but not always necessary. The bus capacitors, C16-17 (C40-41, C64-
64), on the board along with high-frequency bypass caps, C88-89 (C90-91, C92-93) are
designed to take care of the high-frequency ripple-current components from switching
action only. A set of bus capacitors having enough capacitance to handle the audio
ripple current must be placed outside the board if an unregulated power supply is used.
At initial power-on, the shutdown condition (orange LED) will latch for about three
seconds before starting normal operation. Always apply supply voltages before applying
any audio signals and always remove audio signals prior to removing the power
supplies.
Bus Pumping
Since the IRAUDAMP3 is a half bridge configuration, bus pumping occurs when the
amplifier outputs a low frequency signal below 100Hz. Under normal operation during
one half cycle, energy flows from one supply, through the load and into the other supply,
thus causing a voltage imbalance by pumping up the bus voltage. This condition is
reversed during the next half cycle (resulting in bus pumping of the other supply). Bus
pumping is worsened under the following conditions:
–
Lower frequency (bus pumping continues longer)
–
Higher power / output voltage and / or lower load impedance (more energy is
transferred between supplies)
–
Smaller bus capacitors (the same energy will cause a larger voltage increase)
The IRAUDAMP3 has protection features that will shutdown the switching operation if
the bus voltage becomes too high (> 40V) or too low (< 20V). One of the easiest
countermeasures is to drive both of the channels out of phase so that the energy flow
from one channel is consumed by the other and does not return to the power supply.
Input
A proper input signal is an analog signal below 20kHz, up to ±3.5V peak, having a
source impedance of less than 600
. A 30kHz to 60kHz input signal can cause LC
resonance in the output LPF, resulting in an abnormally large amount of reactive current
flowing through the switching stage (especially at 8
or open load), causing OCP
activation. The IRAUDAMP3 has an RC (Zobel) network, to damp the resonance and
protect the board in such a condition. However, these supersonic input frequencies
should be avoided. The input to each of the six channels is made using a separate mono
RCA connector. Although all six channels share a common ground, it is necessary to
connect each channel separately to limit noise and crosstalk between channels.
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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(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類(lèi)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(kāi)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(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
IRAUDAMP5 功能描述:放大器 IC 開(kāi)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(lèi)型:Power Amplifiers 工具用于評(píng)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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