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XPT9305 Datasheet(PDF) 5 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
INPUT CAPACITOR(Ci) SELECTION
In the typical application, an input capacitor (Ci) is required to allow the amplifier to bias the
input signal to the proper dc level for optimum operation. In this case, Ci and the input
impedance of the amplifier form a high-pass filter with the corner frequency determined in
Equation 2.
1
2
c
f
RiCi
(2)
The value of Ci is important, as it directly affects the bass (low-frequency) performance of the
circuit. Consider the example where Zi is
20kΩ and the specification calls for a flat bass
response down to 20Hz. Equation 2 is reconfigured as Equation 3.
1
2
Ci
Rifc
(3)
In this example, Ci is 0.39nF, so one would likely choose a value in the range of 0.39µF to
0.47µF. A further consideration for this capacitor is the leakage path from the input source
through the input network (Ci) and the feedback network to the load. This leakage current
creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially
in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the
best choice. When polarized capacitors are used, the positive side of the capacitor should face
the amplifier input in most applications as the dc level there is held at VDD/2, which is likely
higher than the source dc level. Note that it is important to confirm the capacitor polarity in the
application.
BYPASS CAPACITOR(CB) SELECTION
In the application of XPT9305 in the circuit, the other capacitor CB (connected to the BYP pin) is
very crucial. CB will affect PSRR, switch / switching noise performance. Generally, the capacitance
of the ceramic capacitor CB is 0.1uF ~ 1uF.
In addition to minimize the input and output capacitor size, bypass capacitor size should also be
considered in detail. Bypass capacitor CB is minimized noise is the most important component,
which determines the speed and the output opening to static DC voltage (usually supply the
midpoint voltage1/2VDD) process, the process is slow, open the noise smaller. Select the 1.0uF
CB and a small Ci (in the 0.033uF ~ 0.1uF) will achieve virtually no noise shutdown function. In
the device functions normally (without oscillations or pop-click) and CB 0.1uF, the device will be
more affected by the opening of noise. Therefore, in all except the highest cost sensitive design
is recommended in 1.0uF or larger CB.




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