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E-L4973D3.3 Datasheet(PDF) 9 Page - STMicroelectronics

Part No. E-L4973D3.3
Description  3.5A step down switching regulator
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L4973
Evaluation board
9/27
5
Evaluation board
Figure 4.
Evaluation board circuit
Table 5. Typical performance (using evaluation board) fSW = 100kHz
Output voltage
Output
ripple
Efficiency
Line regulator
Io = 3.5A VCC = 8 to 50V
Load regulator
VCC =35V IO = 1 to 3.5A
3.3V
20mV
81.5 (%)
3mV
6mV
5.1V
20mV
86.7 (%)
3mV
6mV
12V
30mV
93.5 (%)
3mV (VCC =15 to 50V)
4mV
L4973
VCC
C1
C2
R2
C7
C3
C4
C5
C6
R1
D1
L1
3 x
C0
C12
R3
R4
VO
C8
4,5,6
13,14,15
7,8
9
1
17
16
11
2,3
12
D97IN515C
(DIP18)
10
C1=1000
µF/63V
C2=220nF/63V
C3=470nF
C4=1
µF/50V
C5=220pF
C6=22nF
C7=2.7nF
C8=220nF/63V
C0=100
µF/40V(C9,C10,C11)
C12=Optional (220nF)
L1=150
µH K
OOL
µ 77310 - 40 Turns - 0.9mm
R1=9.1K
R2=20K
D1=STPS5L60
VO(V)
R3(K
Ω)
R4(K
Ω)
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
L4973 V3.3
VO(V)
R3(K
Ω)
R4(K
Ω)
5.1
12
15
18
24
0
6.2
9.1
12
18
4.7
4.7
4.7
4.7
L4973 V5.1




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