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NCP2821 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. NCP2821
Description  2.65 W Filterless with Selectable Gain Class−D Audio Amplifier
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP2821
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted)
Characteristic
Unit
Max
Typ
Min
Conditions
Symbol
Total Harmonic Distortion + Noise
THD+N
Vp = 5.0 V, RL = 8 W,
f = 1 kHz, Pout = 0.25 W
Vp = 3.6 V, RL = 8 W,
f = 1 kHz, Pout = 0.25 W
0.05
0.09
%
Efficiency
h
RL = 8 W, f = 1 kHz
Vp = 5 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 600 mW
91
90
%
RL = 4 W, f = 1 kHz
Vp = 5 V, Pout = 2 W
Vp = 3.6 V, Pout = 600 mW
82
81
%
Common Mode Rejection Ratio
CMRR
Vp = 2.5 V to 5.5 V, G = 6 dB
Vic = 0.5 V to Vp − 0.8 V
Vp = 3.6 V, Vic = 1 Vpp
G = 6 dB, f = 1 kHz
G = 12 dB, f = 1 kHz
−62
−59
−53
dB
Power Supply Rejection Ratio
PSRR
Vpripple_pk−pk = 200 mV, RL = 8 W,
Inputs AC grounded, Vp = 3.6 V
f = 217 Hz
f = 1 kHz
−63
−63
dB
Figure 2. Test Setup for Graphs
OUTM
OUTP
GND
Ri
INP
INM
VP
Ri
Ci
Ci
+
+
4.7
mF
+
Audio Input
Signal
Load
30 kHz
Low Pass
Filter
Measurement
Input
Power
Supply
NCP2821
NOTES:
1. Unless otherwise noted, Ci = 100 nF and Ri= 150 kW. 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:
RL = 8 W means Load = 15 mH + 8 W + 15 mH
RL = 4 W means Load = 15 mH + 4 W + 15 mH
Very low DCR 15
mH inductors (50 mW) have been used for the following graphs. Thus, the electrical load
measurements are performed on the resistor (8
W or 4 W) in differential mode.
3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low−pass filter is selected with
(100
W, 47 nF) on each PWM output.




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