AN2435 Datasheet, PDF (18/25 Pages) STMicroelectronics – TM sepic converter in PFC pre-regulator

Conclusion
3
Conclusion
AN2435
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
4.1
18/25
Board description and bench evaluation results
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
C1
470 nF
C2
68 µF
C3
10 nF
C4
47 µF
C5
56 nF
C6
47 nF
C7
10 nF
C8
1.5 µF
D1
STTH208
D2
BRIDGE
D3
1N4148
D4
15 Vz
F1
1A
Description
630 V capacitor
250 V electrolitic capacitor
X2 type capacitor
25V electrolitic capacitor
100 V capacitor
Samll signal capacitor
Small signal capacitor
Small signal capacitor
STMicroelectronics
high voltage ultrafast rectifier
600 V, 1 A standard bridge diode
Standard diode
15 V zener diode
1 A fuse