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L4971 Просмотр технического описания (PDF) - STMicroelectronics
Номер в каталоге
Компоненты Описание
производитель
L4971
1.5A STEP DOWN SWITCHING REGULATOR
STMicroelectronics
L4971 Datasheet PDF : 13 Pages
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L4971
Table 6. Typical Performance (Using Evaluation Board) fsw = 100kHz
Output
Voltage
Output
Ripple
Efficiency
V
CC
=35V I
O
= 1.5A
Line Regulation
I
o
= 1.5A V
CC
= 8 to 55V
3.3V
10mV
84 (%)
3mV
5.1V
10mV
86 (%)
3mV
12V
12mV
93 (%)
3mV (V
CC
=15 to 55V)
Load Regulation
V
CC
=35V I
O
= 0.5 to 1.5A
6mV
6mV
4mV
Figure 4. Test and valuation board circuit.
Vi=8V to 55V
C
1
220
µ
F
63V
C
7
220nF
R
1
20K
C
2
2.7nF
5
L4971
3
2
7
1
C
5
100nF
C
4
22nF
R
2
9.1K
8
4
6
C
6
100nF
D1
ST
PS3L60U
L1
126
µ
H
(77120)
C
8
330
µ
F
V
O
=3.3V/1.5A
R
3
R
4
C1=220
µ
F/63V EKE
C2=2.7nF
C5=100nF
C6=100nF
C7=220nF/63V
C8=330
µ
F/35V CG Sanyo
L1=126
µ
H KoolMu 77120 - 65 Turns - 0.5mm
R1=20K
R2=9.1K
D1=STPS3L60U
D97IN749A
V
O
(V)
3.3
5.1
12
15
18
24
L4971
R3(K
Ω
)
0
2.7
12
16
20
30
R4(K
Ω
)
4.7
4.7
4.7
4.7
4.7
Figure 5. PCB and component layout of the figure 4.
5/13
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