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ꢀꢁ ꢂ ꢃꢄ ꢅꢃ ꢆ
SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
TYPICAL CHARACTERISTICS
LOOP RESPONSE
LOAD REGULATION
LINE REGULATION
180
150
120
90
60
0.10
0.05
0.2
0.1
50
40
1.5 A
Phase
3 A
30
V = 6 V
I
0 A
60
30
20
10
Gain
V
= 12 V
= 18 V
I
0
0
0.00
0.0
−30
−60
−90
−12
−15
−18
−10
−20
−30
−40
−50
−60
V
V
= 12 V
I
V
I
= 3.3 V
O
−0.05
−0.10
−0.1
−0.2
I
f
= 3 A
O
S
= 500 kHz
See Figure 24
See Figure 24
See Figure 24
6
8
10
12
14
16
18
10
1k
10k
100k
1M
0.0
0.5
1.0
1.5
2.0
2.5
3.0
f − Frequency − Hz
V − Input Voltage − V
I
I
− Output Current − A
O
Figure 5
Figure 6
Figure 7
EFFICIENCY
vs
OUTPUT CURRENT
INPUT RIPPLE VOLTAGE
OUTPUT RIPPLE VOLTAGE
100
95
90
85
80
75
70
65
60
55
50
V
= 100 mV/div (ac coupled)
I(Ripple)
V
= 20 mV/div (ac)
O
V = 6 V
I
V = 12 V
I
See Figure 24
V
= 5V/div
(PH)
See Figure 24
V
= 5 V/div
(PH)
V = 18 V
I
V
= 3.3 V
= 500 kHz
O
f
S
See Figure 24
V = 12 V, V = 3.3 V, I = 3 A, f = 500 kHz
I
O
O
S
V
= 12 V, V = 3.3 V, I = 3 A, f = 500 kHz
I
O
O
S
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Time − 1 µs/div
Time − 1 µs/div
I
− Output Current − A
O
Figure 8
Figure 9
Figure 10
POWER UP
PH PIN VOLTAGE
LOAD TRANSIENT RESPONSE
V
= 5 V/div
V
= 12 V, V = 3.3 V
V
= 5 V/div
(LSG)
I
O
I
I
= 3 A, f = 500 kHz
O
S
See Figure 24
V
= 10 mV/div (ac coupled)
O
V
= 2 V/div
O
See Figure 24
V
= 5 V/div
(PH)
V
= 2 V/div
(PWRGD)
I
= 1 A/div
O
See Figure 24
V
= 12 V, V = 3.3 V, I = 3 A, f = 500 kHz
I
O
O
S
Time − 2 ms/div
Time − 1 µs/div
Time − 200 µs/div
Figure 11
Figure 12
Figure 13
11
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