EVALA5972D STMicroelectronics, EVALA5972D Datasheet - Page 25

• Manufacturer Part Number: EVALA5972D
• Description: Power Management Modules & Development Tools EVAL BOARD A5972 Auto Grade
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EVALA5972D

• Input Voltage: 4.4 V to 36 V
• Output Voltage: 1.235 V to 35 V
• Board Size: 23 mm x 20 mm
• Product: Power Management Modules
• Supply Current: 2 A
• Dimensions: 23 mm x 20 mm
• For Use With/related Products: AN1517
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN1517
7.1
Dual output voltage with auxiliary winding
When two output voltages are required, it is possible to create a dual output voltage
converter by using a coupled inductor. During the ON phase the current is delivered to V
while D2 is reverse-biased.
During the OFF phase, the current is delivered through the auxiliary winding to the output
voltage V
be certain that the application is working properly, the load related to the second output
V
Figure 26. Dual output voltage with auxiliary winding
OUT1
C1
10uF
25V
VIN=12V
should be much lower than the load related to V
OUT1
C2
220pF
. This is possible only if the magnetic core has stored sufficient energy. So, to
C3
22nF
R3
4.7k
COMP
Vcc
8
4
2
L5972D
6
GND
7
3
1
5
OUT
FB
D1
STPS2L25U
n=N1/N2=2
OUT
AM00137v1
N2
N1
.
D2
STPS2L25U
Buck-boost regulator
VOUT=3.3V
C4
100uF
10V
VOUT1=5V
50mA
C5
47uF
10V
25/29
OUT