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L4973D3 数据表(PDF) 13 Page - STMicroelectronics

部件名 L4973D3
功能描述  3.5A STEP DOWN SWITCHING REGULATOR
PDF  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4973D3 数据表(HTML) 13 Page - STMicroelectronics

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background image
L1
KoolMm 77120- 24 Turns- 0.9mm
D1
STPS1025
L4973V3.3
VCC
12V
±5%
C1
560uF-25V
HFQ
Panasonic
C2
220nF
R2
22k
C7
1.2nF
C3
33nF
C4
1uF
C5
220pF
C6
22nF
R1
9k1
D1
L1
C9
470uF-25V
HFQ
Panasonic
Vo=3.33V
Io=3.5A
C8
220nF
4,5,6
13,14,15
7,8
10
18
9
1
17
16
INH
SYNC
11
2,3
12
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Io(A)
80
82
84
86
88
90
92
η
(%)
D97IN668A
Figure 33: 12V to 3.3V High Performance Buck Converter (fsw = 200kHz)
L4973
L4973
18
18
VCC2
D97IN669
1
7,8
VCC1
1
7,8
4,5,6
13,14,15
4,5,6
13,14,15
L4973
L4973
18
18
VCC
1
7,8
1
7,8
4,5,6
13,14,15
4,5,6
13,14,15
Figure 34: Synchronization Example
L4973
VCC
C1
C2
R2
C7
C3
C4
C5
C6
R1
D1
L1
C9
C10
Vo1
C8
4,5,6
13,14,15
7,8
10
18
9
1
17
16
INH
SYNC
11
2,3
12
C11
Vo2
n1
n2
D2
D97IN667A
VO2 =VO1
n1 +n2
n1
PO2 < 20% PO1
Figure 35: Multioutput not Isolated (Pin out referred to DIP12+3+3)
L4973V3 - L4973V5 - L4973D3 - L4973D5
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