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NCP1012

Self−Supplied Monolithic Switcher for Low Standby−Power Offline SMPS

ON Semiconductor 

NCP1010, NCP1011, NCP1012, NCP1013, NCP1014

A 7.0 W NCP1013−based Flyback Converter

Featuring Low Standby Power

Figure 30 depicts another typical application showing a

NCP1013−65 kHz operating in a 7.0 W converter up to

70°C of ambient temperature. We can increase the output

power since an auxiliary winding is used, the DSS is

disabled, and 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.

Vbulk

C2 +

47 mF/

450 V

1N4148

D4

R4 22

T1

+ C10

Aux

33 mF/25 V

C8

10 nF

400 V

R7

100 k/

1W

R2

3.3 k

D3

MUR160

NCP1013P06

1 VCC GND 8

2 NC NC 7

3 NC

4 FB

D5

D2

MBRS360T3

L2

22 mH

++

T1

C6 C8

470 mF/16 V

12 V @

0.6 A

+ 100 mF/16 V

C7

GND

R3

1k

R5

39 k

+ 100 mF/10 V

C3

C9

1 nF

IC1

SFH6156−2

C5

C4

100 nF

IC2

TLV431

R6

4.3 k

2.2 nF

Y1 Type

Figure 30. A Typical Converter Delivering 7.0 W from a Universal Mains

Measurements have been taken from a demonstration

board implementing the diagram in Figure 30 and the

following results were achieved, with either the auxiliary

winding in place or through the Dynamic Self−Supply:

Vin = 230 Vac, auxiliary winding, Pout = 0, Pin = 60 mW

Vin = 100 Vac, auxiliary winding, Pout = 0, Pin = 42 mW

Vin = 230 Vac, Dynamic Self−Supply, Pout = 0,

Pin = 300 mW

Vin = 100 Vac, Dynamic Self−Supply, Pout = 0,

Pin = 130 mW

Pout = 7.0 W, h = 81% @ 230 Vac, with auxiliary winding

Pout = 7.0 W, h = 81.3 @ 100 Vac, with auxiliary winding

For a quick evaluation of Figure 30 application example,

the following transformers are available from Coilcraft:

A9619−C, Lp = 3.0 mH, Np:Ns = 1:0.1, 7.0 W

application on universal mains, including auxiliary winding,

NCP1013−65kHz.

A0032−A, Lp = 6.0 mH, Np:Ns = 1:0.055, 10 W

application on European mains, DSS operation only,

NCP1013−65 kHz.

Coilcraft

1102 Silver Lake Road

CARY IL 60013

Email: info@coilcraft.com

Tel.: 847−639−6400

Fax.: 847−639−1469

http://onsemi.com

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