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PAM8202 데이터시트 PDF




PAM에서 제조한 전자 부품 PAM8202은 전자 산업 및 응용 분야에서
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부품번호 PAM8202 기능
기능 Tiny Package 2 Watt Class-D Stereo Audio Amplifier
제조업체 PAM
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PAM8202 데이터시트, 핀배열, 회로
www.DataSheet4U.com
PAM8202
Tiny Package 2 Watt Class-D Stereo Audio Amplifier
DESCRIPTION
The PAM8202 is a 2 Watt per channel, 8-pin, stereo
class D audio amplifier, which offers low THD+N
(0.10%), allowing it to produce high-quality sound
reproduction.
The PAM8202 runs off of a 5 Volt supply at much
higher efficiencies than their class AB cousins,
making it ideal for many portable applications.
The PAM8202 only requires very few external
components (as few as three tiny capacitors),
results in significant cost and board space savings.
The PAM8202 is available in a SOP8 package.
TYPICAL APPLICATION CIRCUIT
FEATURES
2 Watts @ 10% THD per channel output into
a 4 Ohm load at 5V
Support speakers or earphone (4 to 32 ).
Superior low noise without input.
Supply voltage from 2.5V to 5.5 V.
85% efficiency above.
Short Circuit Protection.
Less output capacitor and inductor to save
the space and cost.
Low THD+N
Low quiescent current < 10 mA
APPLICATIONS
Notebook Computers.
PDAs/GPS Navigator/e-Dictionary
Portable DVD Players, Game Machines.
Cellular Phones,VoIP Phones,Screen Phones
MP3 or PMP Players.
Portable Speaker Systme,Portable Amplifier
LCD monitor / TV.
Bluetooth Car-Kit
R
Input
0.47 F 10K
Input
L
0.47 F 10K
Vdd
IN_R
IN_L
VDD -OUT_R
+OUT_R
+OUT_L
GND -OUT_L
33 H
0.47 F
33 H
33 H
0.47 F
0.47 F
33 H
0.47 F
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
PRELIMIARY DATASHEET
Speaker
Speaker
PAM8202 Rev. 1.1
1




PAM8202 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
PAM8202
Tiny Package 2 Watt Class-D Stereo Audio Amplifier
(%)
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
Ap
(W)
(%)
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
Ap
(W)
THD+N vs. Output Power
8 , 1kHz, VDD = 5V
(%)
100
50 Ap
100%
THD+N vs. Output Power
4 , 1kHz, VDD = 5V
Efficiency VS Output Power
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
20
50 100 200 500 1k 2k 5k 10k
THD+N vs. Frequency
8 , 500mW output, VDD = 5V
(Hz)
20k
80%
60%
40%
20%
0%0 1 2 3
Power
Power Dissipation vs. Output Power
4 , 1kHz, VDD = 5V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
0.5
1 1.5 2
Output Power -W
Power Dissipation vs. Output Power
8 , 1kHz, VDD = 5V
(dBr)
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
PRELIMIARY DATASHEET
50 100 200 500 1k 2k 5k
FFT Noise Floor
(16k FFT)
(Hz)
10k 20k
PAM8202 Rev. 1.1
4

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PAM8202 전자부품, 판매, 대치품
www.DataSheet4U.com
PAM8202
Tiny Package 2 Watt Class-D Stereo Audio Amplifier
FCL = 1/ [2 X Cin X (Rin + 10k)]
FCL is the lower corner on frequency response curve.
Cin is very important consider to the lower frequency performance. The Cin should not be too large with small
speakers as the load, because such small speakers usually can not response with lower frequency, delivering too
much low frequency energy into a small speaker which usually got resonant frequency (Fs) around 150Hz is
meaningless and dangerous. This will easily over drive the small speakers. The movement of speaker cone will be
too much under such condition and this also creates unnecessary distortion on mid-to high frequency range
because the speaker is now operating in non-linear area. Speakers can only generate heat but not low frequency
sound when it is over driven, the will cause speaker or amplifier failure in some cases.
Cin should have 10% tolerance or less because the tolerance can cause the input impedance mismatch at FCL
and below.
Output filter
The L and C on each output node of PAM8202 form the low-pass-filter (LPF), the higher corner frequency (FCH) is
determine by equation below.
FCH = 1/ [2 X sqr (L X C)]
FCH is the higher corner on frequency response curve.
Important Notice
The L-C filters (-12dB/Oct) gives twice much attenuation and lower impedance (means lower insertion loss)
compare to those R-C filters (-6dB), but remember, the FCH above is also the resonant frequency of this LC
network. The quality factor (Q) of this resonant network can be very high, depended on the Q of L and C. The high
resonant Q which is usually caused by open-load can generate a very high voltage on speaker terminal, and the
impedance of the L-C network can be very low, thus induces large amount of current flows from output stage of
PAM8202. This always causes part failure. So Do Not test open-load on any class D amplifier with output filters.
LC filter calculator with output load impedance and cut-off frequency
11
f = 2 LC , XL= 2 fL , XC= 2 fC
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
PRELIMIARY DATASHEET
PAM8202 Rev. 1.1
7

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