L4978 데이터 시트보기 (PDF) - STMicroelectronics
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L4978 Datasheet PDF : 13 Pages
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Figure 24. Load transient.
.
Figure 25. Line transient.
.
VCC
(V)
30
20
10
1
2
1ms/DIV
D97IN786
IO = 1A
fsw = 100KHz
VO
(mV)
100
0
-100
Figure 26. Soft start capacitor selection Vs
inductor and Vccmax.
L
(µH)
400
fsw=100KHz
680nF
D97IN745
470nF
330nF
300
200
220nF
100
100nF
0
15 20 25 30 35 40 45 50 VCCmax(V)
L4978
Figure 27. Soft start capacitor selection Vs
inductor and Vccmax.
L
(µH)
fsw=200KHz
D97IN746
56nF
300
47nF
200
33nF
22nF
100
0
15 20 25 30 35 40 45 50 VCCmax(V)
Figure 28. Open loop frequency and phase of
error amplifier .
GAIN
(dB)
D97IN787
Phase
50
GAIN
0
0
-50
45
-100
-150
Phase
90
135
-200
10 102 103 104 105 106 107 108 f(Hz)
9/13
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