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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Typical Operating Characteristics (continued)
(V IN1 = V IN2 = V IN3 = V DD = 3.6V, V AGND = V PGND1 = V PGND2 = 0V, circuit of Figure 2, T A = +25°C, unless otherwise noted.)
CLASS D AMP
1
0.1
0.01
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V IN = 3.6V
R L = 8 Ω
P OUT = 25mW
P OUT = 350mW
P OUT = 100mW
100
10
1
0.1
0.01
TOTAL HARMONIC DISTORTION
vs. OUTPUT POWER
V IN = 3.6V
R L = 8 Ω
100
10
1
0.1
0.01
TOTAL HARMONIC DISTORTION
vs. OUTPUT POWER
V IN = 5V
R L = 4 Ω
0.01
0.1
1
10
100
0
0.2
0.4
0.6
0.8
1.0
0
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (kHz)
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
OUTPUT POWER (W)
FIXED-FREQUENCY-MODE OUTPUT
SPECTRUM vs. FREQUENCY
OUTPUT POWER (W)
AUDIO AMPLIFIER GAIN
vs. FREQUENCY
20
0
-20
-40
-60
-80
-100
-120
-140
R L = 8 Ω
V BATT = 5V
V OUT = -60dBV
UNWEIGHTED
20
0
-20
-40
-60
-80
-100
-120
-140
R L = 8 Ω
V BATT = 5V
V OUT = -60dBV
UNWEIGHTED
FFM -1100kHz
12.25
12.20
12.15
12.10
12.05
12.00
11.95
11.90
11.85
11.80
11.75
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
FREQUENCY (kHz)
AUDIO AMPLIFIER PHASE
vs. FREQUENCY
FREQUENCY (kHz)
AUDIO AMPLIFIER PSRR
vs. FREQUENCY
FREQUENCY (kHz)
WIDEBAND OUTPUT SPECTRUM
SPREAD-SPECTRUM MODE
20
10
0
-10
-20
-30
-40
-50
-60
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
C CMREF = 0.1 μ F
C CMREF = 1 μ F
V RIPPLE = 100mV P-P
AUDIO GAIN = 0dB
R L = 4 Ω
0
-20
-40
-60
-80
-100
-120
-140
R L = 8 Ω
INPUTS AC GROUNDED
0.1
1
10
100
0.1
1
10
0.001
0.01
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (MHz)
10
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