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PDF MP1720 Data sheet ( Hoja de datos )
| Número de pieza | MP1720 | |
| Descripción | 2.7W Mono Class D Low-EMI High-Efficiency Audio Amplifier | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
MP1720
2.7W Mono Class D
Low-EMI High-Efficiency Audio Amplifier
DESCRIPTION
The MP1720 is a high efficiency Class-D audio
amplifier. It utilizes a fu ll bridge outp ut structure
capable of delivering 2.7W into 4 Ω speaker.
This device exhibits the high fidelity of a class
AB amplifier with an efficiency of 90% which
dramatically reduces solution size by integrating
the following:
250m Ω power MOSFETs (VIN =3.3V)
Startup / Shutdown pop elimination
Short circuit /Thermal overload Protection
The MP1720 features a pin-selectable 1MHz or
1.3MHz frequency control or
can be
synchronized to an ext ernal clock source. The
flexible switching frequ ency and internal EMI -
reduction scheme eliminates the need for a n
output LC filter and passes emissio n standards
without filter & with considerable cable.
The MP17 20 has five fixed ga in options.
MP1720-3: 3dB; MP17 20-6: 6dB; MP1720-9:
9dB; MP1720-12: 12dB; MP1720-216: 21.6dB.
The MP172 0 is available in 10-pin MSOP-EP
and 10-pin QFN packages.
FEATURES
Passes FCC-Radiated Emissions Standards
with 24inch of Cable without output filter
2.7W Into 4Ω with 5V VIN @ 10% THD+N
Up to 90% Efficiency
Flexible Switching Frequency setting
Low Noise (53μV Typical) with 3.3V VIN
15ms Start-up time Eliminates pop
Low Quiescent Current (4mA @3.3V)
Low Shutdown Current (0.1μA)
Full Bridge Output Drive
Fully Differential Input
Short circuit Protection
Thermal Shutdown
APPLICATIONS
Cellular Phones
PDAs
MP3 Players
Portable Audio
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Power Supply
IN+ CIN
IN- CIN
Enable
VIN
Cs
INP
INN
PVIN
OUTN
MP1720 OUTP
DGND
PGND
SHDN
CLK
Cs
OUT -
OUT+
50
40
30
20
10
0
-10
30
FCC EMI LIMIT
100
FREQUENCY (MHz)
300
MP1720 Rev. 1.01
www.MonolithicPower.com
8/9/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
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1 page  
MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
PIN FUNCTIONS
Pin #
1
2
3
4 DG
5
Name
VIN
INP
INN
ND
SHDN
6 CLK
7 PGND
8 OUTP
9 OUTN
10 PVIN
Thermal Pad
Description
Analog Power Supply
Positive differential input
Negative differential input
Analog Ground
Shutdown input (drive high to enable the MP1720)
Frequency select and external clock input;
CLK=GND: Operate frequency fCLK=1.0MHz
CLK=FLOAT: Operate frequency fCLK=1.3MHz
CLK=Clocked: Operate frequency fCLK=external clock frequency
Power Ground
Positive BTL output
Negative BTL output
Power Supply
Must be soldered to a ground on PCB
MP1720 Rev. 1.01
www.MonolithicPower.com
8/9/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
5 Page 
MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
APPLICATION INFORMATION
COMPONENT SELECTION
The MP1720 uses a minimum number of external
components to complete a fully bridged Class D
audio amplifier. Use the following sections to
customize the am plifier for y our particul ar
application.
1) Input Coupling Capacitors (CIN)
The MP172 0 is a mon o BTL Class-D amplifier
with differe ntial outputs and inpu ts. If the inp ut
signal is not biased within the recommend ed
common-mode input ra nge or if using a single-
ended source, the input coupling capacitors ar e
used to pass only the AC audio signal to the
input of the amplifier as a high pass filter. Choose
an input coupling capa citor such that the corner
frequency f IN is le ss tha n the des ired pass-ban d
frequency. The formula for the corner frequenc y
is:
fIN
2R
1
CIN IN
(2)
RIN is 15k Ω for MP1720. Speaker s in wirele ss
handsets u sually can’t respond well to lo
w
frequencies, so for this applicatio n the corner
frequency can be set to block the low frequencies.
The input coupling capacitance is calculated as:
CIN
1
2R fIN IN
(3)
If the corner frequency is within the audible band,
the capacito rs should h ave a tolerance of ±10%
or better, because any mismatch i n capacitan ce
causes an impedance mismatch at the corne r
frequency and below.
Tantalum or aluminum electrolytic capacitor with
low-voltage coefficie nts is recom mended, or the
largest package ceram ics capacitor to m inimize
voltage coefficient eff ects, for exam ple X7R
dielectrics is better than Y5V or Z5U.
2) Power Supply Decoupling Capacitor (CS)
The class- D audio a mplifier requires adequate
power supply decoupling to ensure the efficiency
is high and total harmonic distortio n (THD+N) is
low. To ca rry the higher frequen cy transient
current, spikes, or digital hash on the line, a good
low
ESR ceramic capacitor is necessary. Place a 1μF
decoupling capacitor as close as possible to the
device VCC lead. It is very imp ortant for the
efficiency of the class-D amplifier, because a ny
resistance or inductance in the trace between the
capacitor a nd the device may cause a loss. A
10μF or greater capacitor placed n ear the audio
power amplifier would also help for filtering lower-
frequency noise
MP1720 Rev. 1.01
www.MonolithicPower.com
8/9/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP1720.PDF ] | |
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