Datasheet

9/13
L4978
Figure 24. Load transient.
.
Figure 25. Line transient.
.
Figure 26. Soft start capacitor selection Vs
inductor and V
ccmax
.
Figure 27. Soft start capacitor selection Vs
inductor and V
ccmax
.
Figure 28. Open loop frequency and phase of
error amplifier .
2
1
D97IN786
V
CC
(V)
30
20
10
V
O
(mV)
100
0
-100
1ms/DIV
I
O
= 1A
f
sw
= 100KHz
15 20 25 30 35 40 45 50 V
CCmax
(V)
0
100
200
300
400
L
(µH)
D97IN745
680nF
fsw=100KHz
470nF
330nF
220nF
100nF
15 20 25 30 35 40 45 50 V
CC
max(V)
0
100
200
300
L
(µH)
56nF
fsw=200KHz
D97IN746
47nF
33nF
22nF
10 10
3
10
5
10
7
f
(
Hz
)
10
2
10
4
10
6
10
8
-200
-150
-100
-50
GAIN
(dB)
0
50
Phase
0
45
90
135
D97IN787
GAIN
Phase