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參數(shù)資料
| 型號： | EB-120 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 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 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 392K |
| 代理商： | EB-120 |
ATA-120
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 8 of 13
4. Multiply the voltage gain (9.9) by R3 (fixed at 10K
) to get the value of the R
1
gain-setting
resistor, 99K.
Capacitor Selection Graph for Fsw = 700 kHz
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
7
8
9
10
11
12 13 14 15 16 17 18 19 20 21 22 23 24
V
DD
(volts)
G
V
I
560 pF
680 pF
820 pF
1.0 nF
1.2 nF
1.5 nF
1.8 nF
2.2 nF
2.7 nF
3.3 nF
3.9 nF
4.7 nF
5.6 nF
6.8 nF
8.2 nF
10 nF
12 nF
15 nF
18 nF
22 nF
Figure 4 – Determining the Timing Capacitor, C
INT
5.3 Choosing the output L-C Filter
The Inductor-Capacitor (L-C) filter converts the pulse train at POUT to the output voltage that drives the speaker.
The characteristic frequency of the L-C filter (f
0
) needs to be high enough to allow high frequency audio to pass to
the output, yet low enough to filter out high frequency products of the pulses from POUT. The characteristic
frequency of the L-C filter is:
1
0
C
L
×
π
11
2
2
f
=
Equation 6
For the circuit of Figure 3, typical values for the L-C filter are 10μH for the inductor (L2) and 470nF for the
capacitor (C11) resulting in a characteristic frequency of 73 kHz.
The voltage ripple at the output is approximated by the equation:
sw
f
×
≈
DD
RIPPLE
f
V
V
0
Equation 7
The quality factor (Q) of the L-C filter is important. If this is too low, passband frequency may be rolled off, if this
is too high, then peaking may occur at high signal frequencies reducing the passband flatness. The circuit Q is
set by the speaker load resistance (typically 4
or 8
) and both the L and C as illustrated by the following
equation:
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