CHENYI MD3203

MD3203
Filterless 3W Class-D Stereo Audio Amplifier
MD3203
Class-D Stereo Audio Amplifier
Datasheet
Version 1.1
SHENZHEN YR ELECTRONICS CO.,LTD
TEL: 0755-82709111 82709112 82709113 FAX: 0755-82709114
Room 2805 South Tower Dynamic World Bldg Zhonghang Rd, Shenzhen ,P.R. China
For detailed product information, please contact Tony.Wang@yr-ic.com wyj_use@163.com
电话:0755-82709111 827091112 827091113
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网址:Http://www.YR-IC.com
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
Key Features
General Description
—
3W Output at 10% THD with a 4Ω Load and 5V Power
The MD3203
Supply
THD+N feature offers high-quality sound reproduction. The
—
Filterless,Low Quiescent Current and Low EMI
new filterless architecture allows the device to drive speaker
—
High Efficiency up to 90%
directly instead of using low-pass output filters,therefore save
—
Superior Low Noise
system cost and PCB area.
—
Short Circuit Protection
With the same number of external components,the efficiency
—
Thermal Shutdown
of the MD3203 is much better than that of class-AB cousins .
—
Few External Components to Save Space and Cost
It can optimize battery life thus is ideal for portable
—
SOP-16
applications.
Packages Available
— Pb-Free Package
Applications
— LCD Monitors / TV Projectors
— Notebook Computers
— Portable Speakers
— Walkie Takie
— Handsfree phones/Speaker Phones
— Cellular Phones
Typical Application
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is a 3w class-D
audio amplifier. Its low
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
Block Diagram
Pin Configuration & Marking Information
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MD3203
Filterless 3W Class-D Stereo Audio Amplifier
Pin Descriptions
Absolute Maximum Ratings
These are stress ratings only and functional operation
is not implied. Exposure to absolute maximum ratings
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periods may affect device reliability. All voltages
are with respect to ground. for prolonged time
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
Symbol
VIN
Parameter
Test
Conditions
Supply Power
THD+N=1%,f=1kHz, R =4Ω
Output
Power
THD+N=10%,f=1kHz,R=8Ω
THD+N=1%,f=1kHz,R=8Ω
VDD =5.0V,Po=0.5W,R =8Ω
Total Harmonic Distortion Plus
THD+N
Noise
VDD =3.6V,Po=0.5W,R =8Ω
VDD =5.0V,Po=1W,R =4Ω
VDD =3.6V,Po=1W,R =4Ω
Gv
PSRR
Cs
SNR
Vn
Dyn
η
3.2
VDD=3.6V
1.6
VDD=3.0V
1.3
VDD=5.0V
2.5
VDD=3.6V
1.3
VDD=3.0V
0.85
VDD=5.0V
1.8
VDD=3.6V
0.9
VDD=3.0V
0.6
VDD=5.0V
1.4
VDD=3.6V
0.72
VDD=3.0V
0.45
f=1kHz
f=1kHz
Signal-to-noiseratio
Outputnoise
Dynamicrange
0.11
Quiescent Current
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W
W
W
%
%
dB
-58
VDD =3.6V,Po=1W,R =4Ω
f=1kHz
-95
dB
VDD =5V, Vorms=1v,Gv=20dB
f=1kHz
80
dB
VDD =5V,Inputs ac-grounded with
CIN =0.47μF
VDD =5.0V,THD=1%
R L =4Ω,THD=10%
VDD=3.6V
VDD=3.0V
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W
f=1kHz
A-weighting
100
NoA-weighting
150
f=1kHz
90
f=1kHz
VDD=5.0V
IQ
0.15
v
-59
R L =8Ω,THD=10%
Efficiency
0.11
UNIT
f=100Hz
CIN =0.47μF
Crosstalk
0.15
24
VDD =5V,Inputs ac-grounded with
MAX
5.5
VDD=5.0V
Gain
PSRR Power Supply Ripple Rejection
TYP
2.5
THD+N=10%,f=1kHz, R=4Ω
Po
MIN
87
83
dB
μV
dB
%
16
Noload
10
8
mA
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
电话:0755-82709111 827091112 827091113
传真:0755-82709114
地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室
网址:Http://www.YR-IC.com
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
电话:0755-82709111 827091112 827091113
传真:0755-82709114
地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室
网址:Http://www.YR-IC.com
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
电话:0755-82709111 827091112 827091113
传真:0755-82709114
地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室
网址:Http://www.YR-IC.com
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
Application Notes
device.
1. When then MD3203 works with LC filters, it should be
NI-MH(Nickel Metal Hydride)rechargeable batteries or 3 dry
connected with the speaker before it’s powered on,otherwise it
or alkaline batteries.
will be damaged easily.
4. One should not make the input signal too large. Large signal
2. When the MD3203 works without LC filters, it’s better to
can cause the clipping of output signal when increasing the
add a ferrite chip bead at the outgoing line of speaker for
volume. This will damage the device because of big gain of the
suppressing the possible electromagnetic interference.
MD3203
3. The recommended operating voltage is 5.5V.
5. When testing the MD3203 without
When the
Therefore,
it’s
recommened
to
use
either
4
LC filters by using
MD3203 is powered with 4 battery cells, it should be noted
resistor instead of speaker as the output load, the test results,
that the voltage of 4 new dry or alkaline batteries is over 6.0V,
e.g. THD or efficiency, will be worse than those of using
higher than its operation voltage, which will
speaker as load.
Test Setup for Performance Testing
Notes
1. The AP AUX-0025 low pass filter is necessary
for class-D amplifier measurement with AP
analyzer.
Application Information
2. Two 22µH inductors are used in series with
load resistor to emulate the small speaker for
efficiency measurement.
Maximum Gain
As shown in block diagram(page 2),the MD3203 has two
input to amplifier 2, thus the two amplifiers produce
internal amplifier stages.The first stage’s gain is
signals identical in magnitude,but different in
externally configurable,while the second stage’s is
phase by 180º.Consequentl,the differential gain for
internally fixed. The closed-loop gain of the first
the
stage is set by selecting the ratio of Rf to Ri while
AVD=20*log[2*(Rf/Ri)] The MD3203 sets maximum Rf=142k
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IC
is
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
the second stage’s gain is fixed at 2x. The output
Ω ,minimum
of amplifier 1 serves as the
24dB.
Ri=18k Ω ,so the maximum closed-gain is
Mute Operation
The MUTE pin is an input for controlling the output
enable of theOutputs without a volume fade .Quiescent
state of the MD3203,A logic low on this pin disables
current is listed in the electrical characteristic
the outputs,and a logic high on this pin enables the
table.Te MUTE pin can be left floating due to the
outputs,This pin may be used as quick disable or
internal pull-up.
Shutdown operation
In order to reduce power consumption while not in
applied to the SHDN pin,By switching
the SHDN pin
use,the MD3203 contains shutdown circuitry to turn off
connected to GND,the MD3203 supply current draw will
the amplifier’s bias circuitry. This shutdown
be minimized in idle mode,The
feature turns the amplifier off when logic low is
floating due to the internal pull-up.
SHDN pin can be left
Power supply decoupling
The MD3203 is a high performance CMOS audio amplifier
frequency transients,spikes,or digital has on the
that requires adequate power supply decoupling to
line,a
ensure the output THD and PSRR as low as possible .
equivalent-series-resistance(ESR)ceramic
Power supply decoupling affects low as possible .
capacitor, typically 1.0μF ,works best, placing it
Power
frequency
as close as possible to the device VDD terminal.For
response. Optimum decoupling is achieved by using two
filtering lower-frequency noise signals,a large
capacitors of different types targeting to different
capacitor
types of noise on the power supply leads. For higher
recommended,placing
supply
decoupling
affects
low
good
of
20 μ F
it
low
(ceramic)
near
or
the
greater
audio
is
power
amplifier.
Input Capacitor(Ci)
Large input capacitors are both expensive and space
filter with the corner
hungry for portable designs. Clearly,acertain sized
equation below,
capacitor is needed to couple in low frequencies
cost and size,click and pop performance is affected
without severe attenuation.But in many cases the
by the size of the input coupling capacitor Ci.A
speakers used inportable systems,whether internal or
larger input coupling capacitor requires more charge
external,have little ability to reproduce signals
to reach its quiescent DC voltage(nominall 1/2 VDD).
below 100Hz to 150Hz,Thus,using a large input
This charge comes from the internal circuit via the
capacitor
system
feedback and is apt to create pops upon device
performance .In this case,input capacitor(Ci)and
enable.Thus,by minimizing the capacitor size based
input resistance (Ri) of the amplifier form a high-pass
on necessary low frequency response, turn-on pops can
may
not
increase
actual
frequency determined
by
fc=1/2TTRiCi in addition to system
be minimized.
Analog Reference Bypass Capacitor(CBYP)
The analog Reference Bypass Capacitor(CBYP)is the most
reference to the amplifier,which appears as degraded
critical capacitor and serves several important
PSRR and THD+N.
functions.During start-up or recovery from shutdown
A ceramic bypass capacitor(CBYP)with values of 0.47
mode, CBYP determines the rate at which the amplifier
μF to 1.0μF .is recommended for the best THD and
starts up.The second function is to reduce noise
noise performance.Increasing the bypass capacitor
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网址:Http://www.YR-IC.com
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
caused by the power supply coupling into the output
reduces clicking and popping noise from power on/off
drive signal.This noise is from the internal analog
and entering and leaving shutdown.
Ordering Information
电话:0755-82709111 827091112 827091113
传真:0755-82709114
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网址:Http://www.YR-IC.com
MD3203
Filterless 3W Class-D Stereo Audio Amplifier
Symbol
Dimensions Millimeters
Min
Max
A
1.350
1.750
A1
0.100
0.250
A2
1.350
1.550
B
0.330
0.510
C
0.190
0.250
D
9.800
10.000
E
3.800
4.000
E1
5.800
e
6.300
1.270(TYP)
L
0.400
1.270
θ
0°
8°
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传真:0755-82709114
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