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MP1720DQ-3-LF-P

P1-P3P4-P6P7-P9P10-P12P13-P14
MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY
MP1720 Rev. 1.02 www.MonolithicPower.com 10
7/5/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
The peak-to-peak range of limited input voltage
on each input pin V
LIMIT(PP)
can be calculated by
the DC bias voltage V
BIAS
as the following formula.
V
LIMIT (PP)
= 2* (V
BIAS
+0.5) (1)
Take the application with input coupling capacitor
as an example, the input DC bias voltage V
BIAS
on each input pin is set internally (detailed value
please see Input Bias Voltage in the EC table).
For different gain options, the calculated
maximum input signal and the tested maximum
output power, with SE input or differential input,
are shown in the Table 2.
Table 2—Maximum Input voltage and
Maximum Output Power
Test condition:VIN=PVIN=5V; 4 load.
Part
SE input Differential input
V
IN
_
max
(V
PP
)
P
OUT
_max
(W)
V
IN
_
max
(V
PP
)
P
OUT
_max
(W)
MP1720-3 2.99 0.52 5.98 1.9
MP1720-6 2.88 0.93 5.76
2.7 @ 10%
THD+N
MP1720-9 2.72 1.74 5.44
2.7 @ 10%
THD+N
MP1720-
12
2.568 2.62 5.136
2.7 @ 10%
THD+N
MP1720-
216
1.93
2.7 @ 10%
THD+N
3.86
2.7 @ 10%
THD+N
Shutdown Function
The MP1720 SHDN input is a low-active control.
To shutdown MP1720, drive
SHDN low-level
voltage. To enable MP1720, drive
SHDN high-
level voltage. Shutdown function can place the
MP1720 in a low-power (0.1A) shutdown mode
and reduce power consumption and extend
battery life.
Thermal Shutdown/ Short Circuit Protection
The MP1720 provides internal over thermal
protection and short-circuit protection. The
amplifier would be disabled to prevent damage to
the IC if the junction temperature surpasses
+125°C. The junction temperature must fall below
+112°C before normal operation resumes. The
currents of both the high-side and low-side
MOSFETs are measured. If the current exceeds
an internally preset value, all MOSFETs will be
turned off. After the over thermal or short circuit
fault is monitored, the MP1720 remains disabled
status for a minimum of 50s until normal
operation resumes.
Pop Suppression
After driving
SHDN pin high, there is a 15ms
Start-up time to eliminate the startup pop. During
this period, an internal circuitry would charges
the bias voltages of the device to a certain level
to prevent the startup click or pop. And after
driving
SHDN pin low, the all outputs will be set
to high impedance immediately
MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY
MP1720 Rev. 1.02 www.MonolithicPower.com 11
7/5/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
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 amplifier for your particular
application.
1) Input Coupling Capacitors (C
IN
)
The MP1720 is a mono BTL Class-D amplifier
with differential outputs and inputs. If the input
signal is not biased within the recommended
common-mode input range or if using a single-
ended source, the input coupling capacitors are
used to pass only the AC audio signal to the
input of the amplifier as a high pass filter. Choose
an input coupling capacitor such that the corner
frequency f
IN
is less than the desired pass-band
frequency. The formula for the corner frequency
is:
IN
IN IN
1
f
2RC
(2)
R
IN
is 15k for MP1720. Speakers in wireless
handsets usually can’t respond well to low
frequencies, so for this application the corner
frequency can be set to block the low
frequencies.
The input coupling capacitance is calculated as:
IN
IN IN
1
C
2Rf
(3)
If the corner frequency is within the audible band,
the capacitors should have a tolerance of ±10%
or better, because any mismatch in capacitance
causes an impedance mismatch at the corner
frequency and below.
Tantalum or aluminum electrolytic capacitor with
low-voltage coefficients is recommended, or the
largest package ceramics capacitor to minimize
voltage coefficient effects, for example X7R
dielectrics is better than Y5V or Z5U.
2) Power Supply Decoupling Capacitor (C
S
)
The class-D audio amplifier requires adequate
power supply decoupling to ensure the efficiency
is high and total harmonic distortion (THD+N) is
low. To carry the higher frequency transient
current, spikes, or digital hash on the line, a good
low
ESR ceramic capacitor is necessary. Place a 1F
decoupling capacitor as close as possible to the
device VCC lead. It is very important for the
efficiency of the class-D amplifier, because any
resistance or inductance in the trace between the
capacitor and the device may cause a loss. A
10F or greater capacitor placed near the audio
power amplifier would also help for filtering lower-
frequency noise
MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY
MP1720 Rev. 1.02 www.MonolithicPower.com 12
7/5/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
TYPICAL APPLICATION CIRCUIT
Differential
Input
MP1720
VIN
INP
INN
DGND
SHDN
PVIN
PGND
OUTN
OUTP
CLK
OUT+
OUT-
Enable
Ext-clock
1.0MHz
1.3MH z
0. 5~1.4MHz
100pF
C
s
0. 1
10
C
s
IN+
IN-
Figure 2—MP1720 Application Schematic with Differential Input
(Input DC-biased voltage is within the recommended common-mode voltage range)
MP1720
VIN
INP
INN
DGND
SHDN
PVIN
PGND
OUTN
OUTP
CLK
OUT+
OUT-
IN+
IN-
Ext-clock
1.0MHz
1.3MHz
0.5~1.4MHz
Enable
100pF
50
1
1
C
s
0.1
10
C
s
C
IN
C
IN
Differential
Input
Figure 3—MP1720 Application Schematic with Differential Input
(Input DC-biased voltage is out of the recommended common-mode voltage range)
MP1720
VIN
INP
INN
DGND
SHDN
PVIN
PGND
OUTN
OUTP
CLK
OUT+
OUT-
SE Input
C
IN
Enable
C
s
Ext-clock
1.0MHz
1.3MHz
0.5~1.4MHz
C
IN
1
1
0. 1
10
100pF
50
C
s
Figure 4—MP1720 Application Schematic with Single Ended Input
P1-P3P4-P6P7-P9P10-P12P13-P14

MP1720DQ-3-LF-P

Mfr. #:
Buy MP1720DQ-3-LF-P
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Audio Amplifiers 2.7W Class-D Audio Amplifier
Lifecycle:
New from this manufacturer.
Delivery:
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