NCP1271 ON Semiconductor, NCP1271 Datasheet - Page 17

• Manufacturer Part Number: NCP1271
• Description: Soft?skip? Mode Standby Pwm Controller With Adjustable Skip Level And External Latch
• Manufacturer: ON Semiconductor

NCP1271. The standby power consumption of the circuit
is 83 mW with 230 Vac input. The details of the application
85 to
265 Vac
Figure 42 shows a typical application circuit using the
Fuse 2A
Flyback transformer :
Cooper CTX22-17179
Lp = 180uH, leakage 2.5uH max
np : ns : naux = 30 : 6 : 5
Hi-pot 3600Vac for 1 sec, primary to secondary
Hi-pot 8500Vac for 1 sec, winding to core
E3506-A
T1
IC1 NCP1271A
95
90
85
80
75
70
65
60
1N5406 x 4
0
D1 - D4
Figure 42. 57 W Example Circuit Using NCP1271
120 Vac
Figure 43. Efficiency of the NCP1271 Demo
D10 MZP4746A (18V)
10
Board at Nominal Line Voltages
230 Vac
R2 10
20
http://onsemi.com
NCP1271
P
out
30
17
C5 10 nF
(W)
D7 MURS160
C11 1nF/ 1000V
circuit are described in application note AND8242/D. The
efficiency of the circuit at light load up to full load is shown
in Figure 43.
R6 10
R7 511
0.25 / 1W
40
R8
50
D8 MBR3100
60
IC4 TL431
C12
0.15 uF
19 V / 3 A
+
-