NCP1012 ONSEMI [ON Semiconductor], NCP1012 Datasheet - Page 19

• Manufacturer Part Number: NCP1012
• Description: Self−Supplied Monolithic Switcher for Low Standby−Power Offline SMPS
• Manufacturer: ONSEMI [ON Semiconductor]

Typical Application Examples
A 6.5 W NCP1012−Based Flyback Converter
delivering 6.5 W from a universal input. The board uses the
Dynamic Self−Supply and a simplified Zener−type
the following results:
•
•
CEE7.5/2
Figure 28 shows a converter built with a NCP1012
The converter built according to Figure 29 layouts, gave
Efficiency at Vin = 100 Vac and Pout = 6.5 W = 75.7%
Efficiency at Vin = 230 Vac and Pout = 6.5 W = 76.5%
J1
47 R
R1
1
2
2
Figure 29. The NCP1012−Based PCB Layout . . . and its Associated Component Placement
D1
1N4007
D3
1N4007
Figure 28. An NCP1012−Based Flyback Converter Delivering 6.5 W
D2
1N4007
D4
1N4007
E1
10 m/400 V
E2
10 m/16 V
http://onsemi.com
19
R2
150 k
1
2
3
7
feedback. This configuration was selected for cost reasons
and a more precise circuitry can be used, e.g. based on a
TL431:
V
GND
GND
GND
CC
NCP1012
IC1
C1
2.2 nF
GND
HV
FB
U160
4 4
8
D5
5
1
4
PC817
2n2/Y
TR1
C2
IC2
8
7
6
5
470 m/25 V
B150
100 R
D6
E3
R3
11 V
ZD1
R4
180 R
2
1
CZM5/2
J2