Datasheet

L4973 Evaluation board
9/28
5 Evaluation board
Figure 4. Evaluation board circuit
Table 5. Component list (fsw = 150 kHz, V
OUT
= 5 V)
Reference Description Part number Manufacturer
R1 Resistor 15 kΩ 1%
R2 Resistor 15 kΩ 1%
R3 Resistor 2.7 kΩ 1%
R4 Resistor 4.99 kΩ 1%
R5 Not mounted
R6 Not mounted
R7 Not mounted
C1 Capacitor 2.7 nF 5%
C2 Capacitor 470 nF 5%
C3 Capacitor 1 μF 5%
C4 Capacitor 22 nF 5%
C5 Capacitor 150 pF 5%
C6 Not mounted
C7 Not mounted
C8 Capacitor 220 nF 5%
C9 Capacitor 220 nF 5%
C10 Capacitor 470 μF 63V EKY-630ELL471ML20S Nippon Chemi-con
signal GND
GND plane
signal GND
C4
22n
C4
22n
C3A
1u
C3A
1u
C13
NM
C13
NM
R7
NM
R7
NM
R2
15k
R2
15k
C11
150u 50v
C11
150u 50v
1
2
3
JP1JP1
R5
NM
R5
NM
C5
150p
C5
150p
C3
NM
C3
NM
GNDGND
C7
NM
C7
NM
R6 NMR6 NM
GNDGND
OSC
1
OUT
2
OUT
3
GND
4
GND
5
GND
6
VCC
7
VCC
8
BOOT
9
INH
10
COMP
11
VFB
12
GND
13
GND
14
GND
15
V5.1
16
SS
17
SYNC
18
U1
L4973 DIP 18
U1
L4973 DIP 18
L1 68uHL1 68uH
C9
220n
C9
220n
R3
2.7k
R3
2.7k
C2
470n
C2
470n
C12
150u 50v
C12
150u 50v
C1
2.7n
C1
2.7n
C6
NM
C6
NM
Q2
NM
Q2
NM
R1
15k
R1
15k
R4
4.99k
R4
4.99k
1 2
D1
STPS5L60
D1
STPS5L60
VoutVout
VinVin
C10
470u 63v
C10
470u 63v
C8 220nC8 220n
C14
NM
C14
NM
SYNCHSYNCH