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參數(shù)資料
| 型號(hào)： | EB-120 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 20W Class D Single Channel Audio Amplifier |
| 中文描述： | 20瓦D類單聲道音頻放大器 |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大小： | 392K |
| 代理商： | EB-120 |
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ATA-120
Output Catch Diode, D1.
D1 caries the current over the dead-time while both MOSFET switches are off. Place
D1 between pins 7 (POUT) and 8 (PGND) to prevent the voltage at POUT from swinging excessively below
ground.
This is preliminary information on a new product. Specifications are subject to change without notice.
129 Morgan Drive, Norwood, MA 02062
voice: (781) 551-9450
CONTROLLED DOCUMENT: P_903-000009_Rev14 ATA-120 Data Sheet.doc
fax: (781) 440-9528
email: apogee@apogeeddx.com
DRN: PRELIMINARY Page 10 of 13
Input Modulator Capacitor, C8.
C8 is used to set the amplifier switching frequency and is typically on the order
of a few nanofarads. Place C8 as close to the differential input pins (1 and 2) as possible to reduce distortion and
noise.
Reference Bypass Capacitor C5.
C5 filters the V
DD
reference voltage at the IN_P input (pin 1). Place C5 as
close to IN_P 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 2 grounds
together at a single point to prevent noise injection into the amplifier input to reduce distortion. Power
components (C4, C7, C9 and D1 and the speaker return) connect to the power ground. The front-end analog
components (C5, R5, and the input signal ground) connect to the analog ground.
Place the input and feedback resistors R3 and R1 as close to the IN_N input as possible. Make sure that any
traces carrying the switching node (POUT) 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 POUT 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 channel-to-channel coupling through the power supply input.
5.8 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. For the best EMI 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.
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 (C7) is as close to the ATA-120 as possible.
Nodes that carry rapidly changing voltage, such as POUT, need to be made as small as possible. If sensitive
traces run near a trace connected to POUT, place a ground shield between the traces.
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