NCP2821

http://onsemi.com

5

Characteristic

Unit

Max

Typ

Min

Conditions

Symbol

Total Harmonic Distortion + Noise

THD+N

f = 1 kHz, Pout = 0.25 W

f = 1 kHz, Pout = 0.25 W

−

−

0.05

0.09

−

−

%

Efficiency

h

Vp = 5 V, Pout = 1.2 W

Vp = 3.6 V, Pout = 600 mW

−

−

91

90

−

−

%

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

G = 6 dB, f = 1 kHz

G = 12 dB, f = 1 kHz

−62

−59

−53

dB

Power Supply Rejection Ratio

PSRR

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

INP

INM

VP

+

−

+

−

4.7

mF

+

−

Audio Input

Signal

Load

30 kHz

Low Pass

Filter

Measurement

Input

Power

Supply

NCP2821

NOTES:

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:

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.