L4971D(2000) 查看數據表（PDF） - STMicroelectronics
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L4971D Datasheet PDF : 12 Pages
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L4971
Typical Performance (Using Evaluation Board) fsw = 100kHz
Output
Voltage
3.3V
5.1V
12V
Output
Ripple
10mV
10mV
12mV
Efficiency
VCC =35V IO = 1.5A
84 (%)
86 (%)
93 (%)
Line Regulation
Io = 1.5A VCC = 8 to 55V
3mV
3mV
3mV (VCC =15 to 55V)
Load Regulation
VCC =35V IO = 0.5 to 1.5A
6mV
6mV
4mV
Figure 1. Test and valuation board circuit.
Vi=8V to 55V
C1
220µF
63V
C7
220nF
R1
20K
C2
2.7nF
5
L4971
3
2
7
1
C5
100nF C4
22nF
R2
9.1K
8
4
6
C6
100nF
D1
GI
SB360
L1
126µH
(77120)
C8
330µF
VO=3.3V/1.5A
R3
R4
C1=220µF/63V EKE
C2=2.7nF
C5=100nF
C6=100nF
C7=220nF/63V
C8=330µF/35V CG Sanyo
L1=126µH KoolMu 77120 - 65 Turns - 0.5mm
R1=20K
R2=9.1K
D1=GI SB360
D97IN749A
VO(V)
3.3
5.1
12
15
18
24
L4971
R3(KΩ)
0
2.7
12
16
20
30
R4(KΩ)
4.7
4.7
4.7
4.7
4.7
Figure 2. PCB and component layout of the figure 1.
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