L4973D5.1 データシートの表示（PDF） - STMicroelectronics
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L4973D5.1 Datasheet PDF : 16 Pages
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L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
Figure 28: Source Current Rise and Fall Time,
pin 2, 3 (See fig1)
Figure 29: Soft Start Capacitor Selection vs.
Inductor and VCC max (ref. AN938)
Lomax
(µH)
300
250
200
150
100
50
fsw = 100KHz
D97IN653
Css=1µF
Css=820nF
Css=680nF
Css=470nF
Css=220nF
Css=100nF
0
25 30 35 40 45 50 Vi(V)
Figure 30:Soft Start Capacitor Selection vs. In-
ductor and VCC max (ref. AN938)
Lomax
(µH)
D97IN654
150
fsw = 200KHz
100
50
Css=33nF
Css=22nF
Figure 31: Open Loop Frequency and Phase of
Error amplifier
GAIN
(dB)
D97IN663
Phase
50
GAIN
0
0
-50
45
-100
-150
Phase
90
135
0
15 20 25 30 35 40 45 50 Vi(V)
-200
10 102 103 104 105 106 107 108 f(Hz)
Figure 32: 3.5A at VO< 3.3V (see part list fig. 1)
VCC
R2
C1 C2 C7
INH SYNC
7,8
1
17
11
10
18
9
L4973V3.3
2,3
4,5,6
16 13,14,15 12
VP
1
1.5
2
2.5
C8
3
L1
R5
3.6K
2K
4.7K
7.5K
5.1K
R3
4.7K
2K
3.6K
3.6K
1K
Vo
VO=3.36-1.74•
R3
R5
C3
C5
R5
R1
C4
C6
D1
3x
R3
C0
12/16
D97IN666A
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