Datasheet

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L4971
Table 6. Typical Performance (Using Evaluation Board) fsw = 100kHz
Figure 4. Test and valuation board circuit.
Figure 5. PCB and component layout of the figure 4.
Output
Voltag e
Output
Ripple
Efficiency
V
CC
=35V I
O
= 1.5A
Line Regulation
I
o
= 1.5A V
CC
= 8 to 55V
Load Regulation
V
CC
=35V I
O
= 0.5 to 1.5A
3.3V 10mV 84 (%) 3mV 6mV
5.1V 10mV 86 (%) 3mV 6mV
12V 12mV 93 (%) 3mV (V
CC
=15 to 55V) 4mV
D97IN749A
5
2
8
4
1
L4971
C
1
220µF
63V
C
8
330µF
V
O
=3.3V/1.5A
Vi=8V to 55V
R
1
20K
C
2
2.7nF
R
2
9.1K
C
4
22nF
3
7
L1
126µH
(77120)
6
D1
ST
PS3L60U
C
5
100nF
C
7
220nF
C
6
100nF
R
3
R
4
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=STPS3L60U
V
O
(V) R3(KΩ) R4(KΩ)
3.3
5.1
12
15
18
24
0
2.7
12
16
20
30
4.7
4.7
4.7
4.7
4.7
L4971