ncp2890-d ON Semiconductor, ncp2890-d Datasheet - Page 12

• Manufacturer Part Number: ncp2890-d
• Description: 1w Audio Power Amplifier
• Manufacturer: ON Semiconductor

Gain−Setting Resistor Selection (R
NCP2890 should be used in low gain configurations.
values and maximizes the signal to noise ratio, and the
amplifier can still be used without running into the
bandwidth limitations.
recommended to optimize overall system performance.
of applications, and doesn’t require the use of a too large
capacitor C
Input Capacitor Selection (C
the amplifier input terminal. This capacitor creates a
high−pass filter with R
fc
R
In order to optimize device and system performance, the
The low gain configuration minimizes THD + noise
A closed loop gain in the range from 2 to 5 is
An input resistor (R
The input coupling capacitor blocks the DC voltage at
+
in
2 * P * R in * C in
and R
in
f
AUDIO
1
INPUT
set the closed−loop gain of the amplifier.
.
Figure 37. Schematic of the Demonstration Board of the 9−Pin Flip−Chip CSP Device
in
.
* R4, C4: Not Mounted
in
) value of 22 kW is realistic in most
100 kW
, the cut−off frequency is given by
390 nF
R4*
C2
C4*
in
V
)
p
20 kW
R1
R2
C3
in
and R
1 mF
R3
20 kW
f
)
BYPASS
SHUTDOWN
NCP2890, NCV2890
INM
INP
VM_P
http://onsemi.com
300 kW
300 kW
12
V
p
in low frequencies without severe attenuation. However a
large input coupling capacitor requires more time to reach
its quiescent DC voltage (V
turn−on pops.
performs well in many applications (With R
Bypass Capacitor Selection (Cby)
and determines how fast the NCP2890 turns on.
turn−on pop. A 1.0 mF bypass capacitor value
(C
shutdown transitions. The amplifier is still functional with
a 0.1 mF capacitor value but is more susceptible to “pop and
click” noises.
1 mF
The size of the capacitor must be large enough to couple
An input capacitor value between 0.1 m and 0.39 mF
The bypass capacitor Cby provides half−supply filtering
This capacitor is a critical component to minimize the
Thus, a 1.0 mF bypassing capacitor is recommended.
in
SHUTDOWN
CONTROL
= < 0.39 mF) should produce clickless and popless
−
+
−
+
V
C1
p
V
p
20 kW
20 kW
VM
OUTB
OUTA
p
/2) and can increase the
8W
in
= 22 KW).