TAS5705
SLOS549–JUNE 2008...................................................................................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS, SE CONFIGURATION
TOTAL HARMONIC DISTORTION + NOISE
TOTAL HARMONIC DISTORTION + NOISE
vs
vs
FREQUENCY
FREQUENCY
10
1
10
1
V
= 12 V
V
= 18 V
CC
CC
R = 4 Ω (SE)
Gain = 3 dB
R = 4 Ω (SE)
Gain = 3 dB
L
L
P
O
= 2.5 W
P
O
= 5 W
0.1
0.1
P
O
= 1 W
P
O
= 2.5 W
P
O
= 0.5 W
P
O
= 0.5 W
0.01
0.001
0.01
0.001
20
100
1k
10k 20k
20
100
1k
10k 20k
f − Frequency − Hz
f − Frequency − Hz
G011
G012
Figure 23.
Figure 24.
TOTAL HARMONIC DISTORTION + NOISE
OUTPUT POWER
vs
SUPPLY VOLTAGE
vs
OUTPUT POWER
18
15
12
9
10
1
f = 1 kHz
f = 1 kHz
R = 4 Ω (SE)
R = 4 Ω (SE)
L
L
Gain = 3 dB
Gain = 3 dB
THD+N = 10%
0.1
V
CC
= 18 V
6
V
CC
= 12 V
THD+N = 1%
0.01
0.001
3
0
5
10
15
20
25
0.01
0.1
P
1
10
40
V
− Supply Voltage − V
− Output Power − W
CC
O
G014
G013
Figure 25.
Figure 26.
DETAILED DESCRIPTION
POWER SUPPLY
To facilitate system design, the TAS5705 needs only a 3.3-V digital supply in addition to the (typical) 18-V
power-stage supply. An internal voltage regulator provides suitable voltage levels for the gate drive circuitry.
Additionally, all circuitry requiring a floating voltage supply, e.g., the high-side gate drive, is accommodated by
built-in bootstrap circuitry requiring only a few external capacitors.
20
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