參數(shù)資料
型號(hào)： NCP2821
廠商： ON SEMICONDUCTOR
英文描述： 2.65 W Filterless with Selectable Gain Class(2.65W, 可選增益D類音頻放大器)
中文描述： 2.65糯濾波與可選增益級(jí)（2.65W，可選增益?類音頻放大器）
文件頁(yè)數(shù)： 5/19頁(yè)
文件大小： 247K
代理商： NCP2821
NCP2821
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS
(Limits apply for T
A
= +25
°
C unless otherwise noted)
Characteristic
Symbol
Unit
Max
Typ
Min
Conditions
Total Harmonic Distortion + Noise
THD+N
Vp = 5.0 V, R
L
= 8 ,
f = 1 kHz, Pout = 0.25 W
Vp = 3.6 V, R
L
= 8 ,
f = 1 kHz, Pout = 0.25 W
0.05
0.09
%
Efficiency
R
L
= 8 , f = 1 kHz
Vp = 5 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 600 mW
R
L
= 4 , f = 1 kHz
Vp = 5 V, Pout = 2 W
Vp = 3.6 V, Pout = 600 mW
Vp = 2.5 V to 5.5 V, G = 6 dB
V
ic
= 0.5 V to Vp 0.8 V
Vp = 3.6 V, V
ic
= 1 V
pp
G = 6 dB, f = 1 kHz
G = 12 dB, f = 1 kHz
Vp
ripple_pkpk
= 200 mV, R
L
= 8 ,
Inputs AC grounded, Vp = 3.6 V
f = 217 Hz
f = 1 kHz
91
90
%
82
81
%
Common Mode Rejection Ratio
CMRR
62
59
53
dB
Power Supply Rejection Ratio
PSRR
63
63
dB
Figure 2. Test Setup for Graphs
OUTM
OUTP
GND
R
i
INP
INM
VP
R
i
C
i
C
i
+
+
4.7 F
+
Audio Input
Signal
Load
30 kHz
Low Pass
Filter
Measurement
Input
Power
Supply
NCP2821
NOTES:
1. Unless otherwise noted, C
i
= 100 nF and R
i
= 150 k . Thus, the gain setting is 2 V/V and the cutoff frequency of the
input high pass filter is set to 10 Hz. Input capacitors are shorted for CMRR measurements.
2. To closely reproduce a real application case, all measurements are performed using the following loads:
R
L
= 8 means Load = 15 H + 8
+ 15 H
R
L
= 4 means Load = 15 H + 4 + 15 H
Very low DCR 15 H inductors (50 m ) have been used for the following graphs. Thus, the electrical load
measurements are performed on the resistor (8 or 4 ) in differential mode.
3. For Efficiency measurements, the optional 30 kHz filter is used. An RC lowpass filter is selected with
(100
, 47 nF) on each PWM output.
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