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XPT9305 Datasheet(PDF) 4 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
VDD=3.7V
1.2
THD+N=10%,f=1KHz,
RL=4Ω
VDD=5.0V
3
VDD=4.2V
2.1
VDD=3.7V
1.7
THD+N=1%,f=1KHz,
RL=2
Ω
VDD=5.0V
3.5
VDD=4.2V
2.3
VDD=3.7V
1.8
THD+N=10%,f=1KHz,
RL=2
Ω
VDD=5.0V
5
VDD=4.2V
3.3
VDD=3.7V
2.6
THD+N
Total Harmonic
Distortion Plus Noise
AVD=2,
20Hz≤f≤20KHz,RL=4Ω,
PO=0.5W
0.5
%
PSRR
Power Supply Ripple
VDD=4.9V to 5.1V
65
80
dB
APPLICATION INFORMATION
INPUT RESISTANCE (Ri) SELECTION
The XPT9305 contains two stage gains, the first stage gain can be configured by an external
input resistor, and the second stage gain is the internal fixation. By choosing the input
resistance value can set the gain of the amplifier:
Ri
K
K
Gain
3
100
2
(1)
Any mismatch between the resistors results in a differential gain error that leads to an increase
in THD+N, decrease in PSRR and CMRR, as well as an increase in output offset voltage.
Resistors with a tolerance of 1% or better are recommended. The gain setting resistors should
be placed as close to the device as possible. Keeping the input traces close together and of the
same length increases noise rejection in noisy environments. Noise coupled onto the input
traces which are physically close to each other will be common mode and easily rejected. Low
gain and high voltage signal can make the chip performance more prominent.
DECOUPLING CAPACITOR(Cs)
XPT9305 is a high performance audio power amplifier, it needs for proper power supply
decoupling to ensure its high efficiency and low harmonic distortion. Decoupling capacitor with
low impedance ceramic capacitor, as close to the chip power supply pin, because any resistor,
capacitor and inductor are likely to affect the efficiency of power conversion. A 220uF or larger
capacitors placed near the power supply will get better filter effect.




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