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| 型号： | NCP4894MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/19页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 1W DIFF 10-DFN |
| 标准包装： | 1 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 1.8W x 1 @ 8 欧姆 |
| 电源电压： | 2.2 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，短路和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 10-DFN（3x3） |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP4894MNR2GOSCT |
NCP4894
http://onsemi.com
13
GainSetting Resistor Selection (Rin and Rf)
Rin and Rf set the closedloop gain of both amplifiers.
In order to optimize device and system performance, the
NCP4894 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
applications, and doesn’t require the use of a very 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 NCP4894 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 31. Demonstration Board Schematic
+
VP
INM
VP
RL
8
W
OUTA
OUTB
VMC
BRIDGE
INP
BYPASS
20 k
W
1
mF
1
mF
SHUTDOWN
CONTROL
20 k
W
1
mF
C4
R4
R2
C2
+
20 k
W
20 k
W
R1
C1
R5
VM
BYPASS
SD SELECT
SD MODE
C3
1
mF
VP
J4
J5
R3
100 k
W
J10
J1
VP
GND
J2
J3
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