NCP1271 datasheet(18/19 Pages) ONSEMI

Part #	NCP1271

Description	Soft?뭆kip Mode Standby PWM Controller with Adjustable Skip Level and External Latch

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1271

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Figure 42. 57 W Example Circuit Using NCP1271

IC1 NCP1271A

+

−

85 to

265 Vac

19 V / 3 A

D8 MBR3100

E3506−A

1N5406 x 4

D7 MURS160

R7 511

IC4 TL431

0.25 / 1W

R2 10

D10 MZP4746A (18V)

R6 10

C5 10 nF

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

C12

0.15 uF

T1

D1 − D4

C11 1nF/ 1000V

R8

Fuse 2A

Figure 42 shows a typical application circuit using the

NCP1271. The standby power consumption of the circuit

is 83 mW with 230 Vac input. The details of the application

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.

Figure 43. Efficiency of the NCP1271 Demo

Board at Nominal Line Voltages

Pout (W)

60

50

40

30

20

0

60

65

70

75

80

85

90

10

95

230 Vac

120 Vac

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NCP1271 Datasheet(PDF) 18 Page - ON Semiconductor

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