NCP1015 データシートの表示（PDF） - ON Semiconductor

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NCP1015

Self-Supplied Monolithic Switcher for Low Standby Power Offline SMPS

ON Semiconductor 

NCP1015

Typical Application Examples

A 6.5 W NCP1015−based Flyback converter. (For

evaluation a universal NCP1012 demo−board can be used)

Figure 27 shows a converter originally built with a

NCP1012 which can be easily used for evaluation of

NCP1015 device delivering 6.5 W from a universal volts

input range. The board uses the Dynamic Self−Supply and

a simplified zener−type feedback. This configuration was

selected for cost reasons and a more precise circuitry can be

used, e.g. based on a TL431:

R1

47 R

1

2

J1

CEE7.5/2

D1

1N4007

D2

1N4007

E1

10 m/400 V

D3

1N4007

D4

1N4007

E2

10 m/63 V

R2

150 k

C1

2n2/Y

D5

U160

IC1

NCP1012

1

5

VCC DRAIN

2

3

7

GND

GND

GND

FB 4

8

GND

1 TR1 8

7

4

6

5

D6

B150

E3

470 m/25 V

IC2

PC817

ZD1

11 V

R3

100 R

2

1

J2

CZM5/2

R4

180 R

C2

2n2/Y

Figure 27. A NCP1012−based Flyback Converter Delivering 6.5 W

The converter built according to Figure 28 layouts, gave

the following results:

• Efficiency at Vin = 100 Vac and Pout = 6.5 W = 75.7%

• Efficiency at Vin = 230 Vac and Pout = 6.5 W = 76.5%

Figure 28. The NCP1012−based PCB Layout and its Associated Component Placement

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