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XPT9305 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part No. XPT9305
Description  Audio Power Amplifier
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Maker  ETC2 [List of Unclassifed Manufacturers]
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SHENZHEN XPTEK TECHNOLOGY CO., LTD
XPT9305
Mono 5W
THD=10%, 2
Ω Load , Class-D Audio Power Amplifier
Address:The 5th floor, R3-A, hi tech Industrial Park, Nanshan District, Shenzhen, Guangdong Prov. China
Website:www.xptek.cn
The Micro message No.:szxpt168
Sales:sales@xptek.cn
Technical support:support@xptek.cn
Design servicesdesign@xptek.cn
OUTPUT FILTER
Design the XPT9305 without the filter if the traces from amplifier to speaker are short (<10cm).
Most applications require a ferrite bead filter. The ferrite filter reduces EMI around 1MHz and
higher (FCC and CE only test radiated emissions greater than 30MHz).When selecting a ferrite
bead, choose one with high impedance at high frequencies, but low impedance at low
frequencies. Use an LC output filter if there are low frequency (<1MHz) EMI-sensitive circuits
and/or there are long wires from the amplifier to the speaker. When both an LC filter and a
ferrite bead filter are used, the LC filter should be placed as close as possible to the IC followed
by the ferrite bead filter.
Figure3.Typical Ferrite Chip Bead Filter
Figure4.Typical LC Output Filter, Cutoff Frequency of 28 kHz




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