L5972D_0710 Datasheet, PDF (10/15 Pages) STMicroelectronics – 2A switch step down switching regulator

Application ideas
6
Application ideas
L5972D
Figure 17. Positive buck-boost regulator
VIN=5V
C1
10uF
10V
Ceramic
Vcc
8
COMP
4
2
C2
220pF
C3
22nF
R3
4.7k
L5972D
67
GND
OUT
1
D1
STPS2L25U
FB
5
3
L1
33uH
D2
STPS2L25U
VOUT=12V/0.45A
24k
C4
M1
100uF
STN4NE03L
16V
2.7k
Figure 18. Buck-boost regulator
VIN=5V
Vcc
8
OUT
1
C1
10uF
10V
Ceramic
C2
10uF
25V
Ceramic
C3
220pF
COMP
4
2
C4
22nF
R3
4.7k
L5972D
67
GND
FB
5
3
2.7k
24k
L1
33uH
D1
STPS2L25U
C5
100uF
16V
VOUT=-12V/0.45A
Figure 19. Dual output voltage with auxiliary winding
n=N1/N2=2 _D2
N2
STPS2L25U
VOUT1=5V
50mA
VIN=12V
Vcc
8
OUT
1
C1
10uF
25V
COMP
4
2
C2
220pF
C3
22nF
R3
4.7k
L5972D
67
GND
FB
5
3
N1
D1
STPS2L25U
VOUT=3.3V
C4
100uF
10V
C5
47uF
10V
10/15