L4973 STMicroelectronics, L4973 Datasheet - Page 9

• Manufacturer Part Number: L4973
• Description: 3.5A STEP DOWN SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

L4973
5
Evaluation board
Figure 4.
Table 5. Typical performance (using evaluation board) f
V
Output voltage
CC
C1=1000µF/63V
C2=220nF/63V
C3=470nF
C4=1µF/50V
C5=220pF
C6=22nF
C7=2.7nF
C8=220nF/63V
C0=100µF/40V(C9,C10,C11)
C12=Optional (220nF)
L1=150µH K
R1=9.1K
R2=20K
D1=STPS5L60
3.3V
5.1V
C1
12V
Evaluation board circuit
R2
C2
OOL
µ 77310 - 40 Turns - 0.9mm
C7
C3
Output
ripple
20mV
20mV
30mV
C4
C5
Efficiency
81.5 (%)
86.7 (%)
93.5 (%)
1
17
16
7,8
11
R1
C6
10
V
L4973
3.3
5.1
(DIP18)
O
12
15
18
24
(V)
13,14,15
I
o
4,5,6
3mV (V
D97IN515C
L4973 V3.3
= 3.5A V
R3(KΩ)
Line regulator
2.7
12
16
20
30
0
2,3
12
CC
9
3mV
3mV
CC
=15 to 50V)
R4(KΩ)
= 8 to 50V
4.7
4.7
4.7
4.7
4.7
SW
C8
D1
L1
= 100kHz
3 x
C0
V
V
O
5.1
12
15
18
24
CC
(V)
Load regulator
=35V I
Evaluation board
L4973 V5.1
C12
R3(KΩ)
6mV
6mV
4mV
6.2
9.1
12
18
0
O
= 1 to 3.5A
R4(KΩ)
V
R3
R4
O
4.7
4.7
4.7
4.7
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