Conclusion

AN2435

18/25

3

Conclusion

This document presented the sepic converter operating in transition mode for power factor

correction applications. The ripple steering technique was also presented. The basic theory

behind the sepic converter and the ripple steering technique was discussed and design

equations were outlined. An example of a design was proposed.

3.1

References

1.

Analysis and design of SEPIC converter in boundary conduction mode for universal-

line power factor correction applications. From Power Electronics Specialists

Conference, 2001. PESC. 2001 IEEE 32nd Annual.

2.

L6561, enhanced transition mode power factor corrector (AN966).

3.

Minimize filtering with ripple steering. Published in Analog Zone.

4.

Control loop modeling of L6561-based TM PFC (AN1089)

5.

Transition-mode PFC controller (L6562 datasheet)

4

Board description and bench evaluation results

4.1

Board description

This section gives the bill of material and the schematic of the board according to the

electrical specifications given in Section 2.

Table 2.

Bill of material

Part

Value

Description

C1

470 nF

630 V capacitor

C2

68 µF

250 V electrolitic capacitor

C3

10 nF

X2 type capacitor

C4

47 µF

25V electrolitic capacitor

C5

56 nF

100 V capacitor

C6

47 nF

Samll signal capacitor

C7

10 nF

Small signal capacitor

C8

1.5 µF

Small signal capacitor

D1

STTH208

STMicroelectronics

high voltage ultrafast rectifier

D2

BRIDGE

600 V, 1 A standard bridge diode

D3

1N4148

Standard diode

D4

15 Vz

15 V zener diode

F1

1 A

1 A fuse