NCP1015 ON Semiconductor, NCP1015 Datasheet - Page 19

• Manufacturer Part Number: NCP1015
• Description: Self-supplied Monolithic Switcher For Low Standby-power Offline Smps W/out Ovp
• Manufacturer: ON Semiconductor

A 7.0 W NCP1015-based Flyback Converter Featuring Low Standby Power
NCP1015-65 kHz operating in a 7 W converter up to 70°C
of ambient temperature. We can grow-up the output power
since an auxiliary winding is used, the DSS is disabled, and
board implementing Figure 12 12's sketch and the following
results were achieved, with either the auxiliary winding in
place or through the Dynamic Self-Supply:
V
V
V
300 mW
V
130 mW
P
P
Vbulk
47 mF/
out
out
450 V
in
in
in
in
Figure 29 shows another typical application showing a
Measurements have been taken from a demonstration
C2
= 230 Vac, auxiliary winding, P
= 100 Vac, auxiliary winding, P
= 230 Vac, Dynamic Self-Supply, P
= 100 Vac, Dynamic Self-Supply, P
= 7 W, h = 81% @ 230 Vac, with aux winding
= 7 W, h = 81.3% @ 100 Vac, with aux winding
+
+ 100 mF/10 V
R2
3.3 k
C3
Figure 29. A Typical Converter Delivering 5 W from a Universal Mains
+ C10
33 mF/25 V
1N4148
D4
out
out
C9
1 nF
1
2
3
4
R4 22
= 0, P
= 0, P
V
NC
NC
FB
NCP1015
CC
Aux
T1
DRAIN
out
out
GND
in
in
NC
= 60 mW
= 42 mW
= 0, P
= 0, P
MUR160
8
7
5
http://onsemi.com
C8
10 nF
400 V
in
in
D3
NCP1015
=
=
19
R7
100 k/
1 W
thus offering more room for the MOSFET. In this
application, the feedback is made via a TLV431 whose low
bias current (100 mA min) helps to lower the no-load
standby power.
the following transformers are available from Coilcraft:
A9619-C, L
universal mains, including auxiliary winding, NCP1015-
65 kHz
A0032-A, L
on European mains, DSS operation only, NCP1015-65 kHz
IC1
SFH6156-2
For a quick evaluation of Figure 29 application example,
Coilcraft
1102 Silver Lake Road
CARY, IL 60013
Email:
Tel. : [phone]
Fax.: [phone]
Y1 Type
2.2 nF
T1
C5
[e-mail]
D2
MBRS360T3
p
p
= 3 mH, Np : Ns = 1: 0.1, 7 W application on
= 6 mH, Np : Ns = 1: 0.055, 10 W application
IC2
TLV431
R3
1 k
470 mF/16 V
C6 C8
100 nF
+
C4
+
22 mH
L2
R5
39 k
R6
4.3 k
+
100 mF/16 V
C7
12 V @
0.5 A
GND