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| E-L4971D013TR Datasheet, PDF (5/13 Pages) STMicroelectronics – 1.5A STEP DOWN SWITCHING REGULATOR | |||
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L4971
Table 6. Typical Performance (Using Evaluation Board) fsw = 100kHz
Output
Voltage
Output
Ripple
Efficiency
VCC =35V IO = 1.5A
Line Regulation
Io = 1.5A VCC = 8 to 55V
3.3V
10mV
84 (%)
3mV
5.1V
10mV
86 (%)
3mV
12V
12mV
93 (%)
3mV (VCC =15 to 55V)
Load Regulation
VCC =35V IO = 0.5 to 1.5A
6mV
6mV
4mV
Figure 4. 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
ST
PS3L60U
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=STPS3L60U
D97IN749A
VO(V)
3.3
5.1
12
15
18
24
L4971
R3(Kâ¦)
0
2.7
12
16
20
30
R4(Kâ¦)
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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