–V

†

†

-V

-5

3255

VIN

2.7V TO 16V

1

3

8

5

4

6, 7

GND

NFB

S/S

D2

P6KE-15A

D3

1N4148

D1

MBRS130LT3

C1

22 µF

C2

0.047 µF

C3

0.0047 µF

R1

2k

R3

2.49k

1%

R2

2.49k

1%

C4

47 µF

ON

OFF

2

1

4

T1

3

•

•

•

•

+

+

Figure 24. Positive to Negative Converter with Direct Feedback

Figure 23. Additional Application Diagram, 5.0 V Input, ±12 V Output Dual

Boost Converter

VCC

VSW

+

+

VC

FB

GND

GND

0.01 µF

200 pF

22 µF

15 µH

22 µF

1.28 k

5.0 k

SS

Test

1

2

3

4

5

6

7

8

+5.0 V

SS

C6 C1

R1

R2

R3

10.72 k

C5

22 µF

C3

D3

D2

L1

D1

-12 V

+12 V

C4

0.1 µF

AGND

PGND

3255

VIN

FB

VC

VIN

2.7V TO 13V

1

3

8

5

2

4

6, 7

GND

NFB

VSW

S/S

P6KE-20A

1N4148

MBRS140T3

MBRS140T3

C1

22 µF

R2

1.21k

1%

R1

13k

1%

C2

0.047 µF

C3

0.0047 µF

R3

2k

R5

2.49k

1%

R4

12.1k

1%

15V

C4

47 µF

C5

47 µF

ON

OFF

2, 3

6, 7

5

T1

4

8

8

1

•

•

•

•

•

•

+

+

+

+

-15V

Figure 25. Dual Output Flyback Converter with Over Voltage Protetion

FC3255 1.5A PWM Switching Regulators