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| 型號： | EV0030 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 20W Class D Mono Single Ended Audio Amplifer |
| 中文描述： | D類單聲道20瓦單端音頻放大器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 344K |
| 代理商： | EV0030 |
MP7720 – 20W CLASS D MONO SINGLE ENDED AUDIO AMPLIFIER
MP7720 Rev. 1.9
3/13/2006
www.MonolithicPower.com
8
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
Output Catch Diode, D1
D1 carries the current over the dead-time while
both MOSFET switches are off. Place D1
between pins 7 (SW) and 8 (PGND) to prevent
the voltage at SW from swinging excessively
below ground.
Input Modulator Capacitor, C3
C3 is used to set the amplifier switching
frequency and is typically on the order of a few
nanofarads. Place C3 as close to the differential
input pins (1 and 2) as possible to reduce
distortion and noise.
Reference Bypass Capacitor, C2
C2 filters the V
DD
reference voltage at the
PIN input (pin 1). Place C2 as close to PIN as
possible to improve power supply rejection and
reduce distortion and noise at the output.
Use two separate ground planes, analog
ground (AGND) and power ground (PGND),
and connect the two grounds together at a
single point to prevent noise injection into the
amplifier input to reduce distortion. Power
components (C5, D1, C6 and C8) connect to
the
power
ground.
components (C2, C3, R2, and the input source
ground) connect to the analog ground.
The
quiet
analog
Place the input and feedback resistors R1 and
R4 as close to the NIN input as possible. Make
sure that any traces carrying the switching node
(SW) voltage are separated far from any input
signal traces. If multiple amplifiers are used on
a single board, make sure that each channel is
physically separated to prevent crosstalk. If it is
required to run the SW trace near the input,
shield the input with a ground plane between
the traces. Make sure that all inductors used on
a single circuit board have the same orientation.
If multiple channels are used on a single board,
make sure that the power supply is routed from
the source to each channel individually, not
serially.
This
prevents
coupling through the power supply input.
channel-to-channel
Electro-Magnetic Interference (EMI)
Considerations
Due to the switching nature of the Class D
amplifier, care must be taken to minimize the
effects of electromagnetic interference from the
amplifier. However, with proper component
selection and careful attention to circuit layout,
the effects of the EMI due to the amplifier
switching can be minimized.
The power inductors are a potential source of
radiated
emissions.
performance, use toroidal inductors, since the
magnetic field is well contained inside the core.
However toroidal inductors can be expensive to
wind. For a more economical solution, use
shielded gapped ferrite or shielded ferrite
bobbin core inductors. These inductors typically
do not contain the field as well toroidal
inductors, but usually can achieve a better
balance of good EMI performance with low
cost.
For
the
best
EMI
The size of high-current loops that carry rapidly
changing currents needs to be minimized. To
do this, make sure that the V
DD
bypass
capacitor (C5) is as close to the MP7720 as
possible.
Nodes that carry rapidly changing voltage, such
as SW, need to be made as small as possible.
If sensitive traces run near a trace connected to
SW, place a ground shield between the traces.
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