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參數(shù)資料
| 型號： | NCP2890EVB |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP2890 |
| 設計資源： | NCP2890 Demo Board BOM NCP2890EVB Design Resources NCP2890 Demo Board Schematic |
| 標準包裝： | 1 |
| 放大器類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 1.08W x 1 @ 8 歐姆 |
| 電源電壓： | 2.2 V ~ 5.5 V |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | NCP2890 |
| 已供物品： | 板 |
| 其它名稱： | NCP2890EVBOS |
NCP2890, NCV2890
http://onsemi.com
12
GainSetting Resistor Selection (Rin and Rf)
Rin and Rf set the closedloop gain of the amplifier.
In order to optimize device and system performance, the
NCP2890 should be used in low gain configurations.
The low gain configuration minimizes THD + noise
values and maximizes the signal to noise ratio, and the
amplifier can still be used without running into the
bandwidth limitations.
A closed loop gain in the range from 2 to 5 is
recommended to optimize overall system performance.
An input resistor (Rin) value of 22 k
W is realistic in most
of applications, and doesn’t require the use of a too large
capacitor Cin.
Input Capacitor Selection (Cin)
The input coupling capacitor blocks the DC voltage at
the amplifier input terminal. This capacitor creates a
highpass filter with Rin, the cutoff frequency is given by
fc
+
1
2*
P *Rin *Cin
.
The size of the capacitor must be large enough to couple
in low frequencies without severe attenuation. However a
large input coupling capacitor requires more time to reach
its quiescent DC voltage (Vp/2) and can increase the
turnon pops.
An input capacitor value between 0.1
m and 0.39 mF
performs well in many applications (With Rin = 22 K
W).
Bypass Capacitor Selection (Cby)
The bypass capacitor Cby provides halfsupply filtering
and determines how fast the NCP2890 turns on.
This capacitor is a critical component to minimize the
turnon
pop.
A
1.0
mF bypass capacitor value
(Cin = < 0.39
mF) should produce clickless and popless
shutdown transitions. The amplifier is still functional with
a 0.1
mF capacitor value but is more susceptible to “pop and
click” noises.
Thus, a 1.0
mF bypassing capacitor is recommended.
Figure 37. Schematic of the Demonstration Board of the 9Pin FlipChip CSP Device
+
+
Vp
INM
Vp
300 k
W
300 k
W
8
W
OUTA
OUTB
20 k
W
20 k
W
INP
BYPASS
20 k
W
1
mF
390 nF
VM
VM_P
SHUTDOWN
CONTROL
C3
1
mFC1
SHUTDOWN
R2
C2
AUDIO
INPUT
Vp
R3
20 k
W
R4*
R1
100 k
W
C4*
* R4, C4: Not Mounted
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