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L4973D3 датащи(PDF) 12 Page - STMicroelectronics

номер детали L4973D3
подробное описание детали  3.5A STEP DOWN SWITCHING REGULATOR
PDF  16 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4973D3 датащи(HTML) 12 Page - STMicroelectronics

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



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