Datasheet

 
 
 
SLVS519A − MAY 2004 − REVISED OCTOBER 2004
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14
TYPICAL CHARACTERISTICS
Conditions are V
I
= 12 V, V
O
= 3.3 V, f
s
= 500 kHz, I
O
= 3 A, T
A
= 25 °C, unless otherwise noted
Figure 5
−60
−50
−40
−30
−20
−10
0
10
20
30
40
50
60
100 1 k 10 k 100 k 1 M
−180
−150
−120
−90
−60
−30
0
30
60
90
120
150
180
Gain
Phase
f − Frequency − Hz
G − Gain − dB Phase − Degrees
MEASURED LOOP RESPONSE
See Figure 25
Figure 6
−0.3
−0.2
−0.1
0
0.1
0.2
0.3
0 0.5 1 1.5 2 2.5 3 3.5
V
I
= 18 V
V
I
= 12 V
V
I
= 6 V
LOAD REGULATION
I
O
− Output Current − A
Output Voltage Change − %
See Figure 25
Figure 7
−0.1
−0.08
−0.06
−0.04
−0.02
0
0.02
0.04
0.06
0.08
0.1
468
10 12 14 16 18 20 22
I
O
= 1.5 A
I
O
= 0 A
I
O
= 3 A
Output Voltage Change − %
V
I
− Input Voltage − V
LINE REGULATION
See Figure 25
Figure 8
50
55
60
65
70
75
80
85
90
95
100
01234
V
I
= 18 V
V
I
= 12 V
V
I
= 6 V
I
O
− Output Current − A
Efficiency − %
EFFICIENCY
vs
OUTPUT CURRENT
See Figure 25
Figure 9
V
I(RIPPLE)
= 100 mV/div (ac coupled)
V
(PH)
= 5 V/div
INPUT RIPPLE VOLTAGE
Time − 1 µs/div
Amplitude
See Figure 25
Figure 10
V
O(RIPPLE)
= 10 mV/div (ac coupled)
V
(PH)
= 5 V/div
OUTPUT RIPPLE VOLTAGE
Time − 1 µs/div
Amplitude
See Figure 25
Figure 11
V
(LSG)
= 5 V/div
V
(PH)
= 5 V/div
GATE DRIVE VOLTAGE
Time − 1 µs/div
Amplitude
See Figure 25
Figure 12
V
O
= 50 mV/div (ac coupled)
I
(PH)
= 1 A/div
LOAD TRANSIENT RESPONSE
Time − 200 µs/div
Load Transient Response − mV
See Figure 25
Figure 13
V
I
= 5 V/div
V
O
= 2 V/div
V
(PWRGD)
= 2 V/div
POWER UP
Time − 2 ms/div
Power Up Response − mV
See Figure 25