Conclusion

AN3111

22/23

Doc ID 16815 Rev 2

4

Conclusion

Running at transition mode provides the benefit of lower switching losses and spread of the

EMI spectrum. This buck-boost converter achieves constant power by operating at constant

peak current, and high power factor is achieved by reshaping the current waveform near the

zero crossing of the line voltage. This single-stage buck-boost converter provides a cost-

effective solution for offline non-isolated LED applications. This single-stage LED driver has

open load and short-circuit protection.

5

Reference

1.

2.

AN966 application note

3.

L6562A datasheet

6

Revision history

Table 3.

Document revision history

Date

Revision

Changes

10-Feb-2010

1

Initial release.

08-Feb-2011

2

Corrected Figure 4, section “2.2 18 W single-stage offline LED driver

for EU voltage range” to section “2.5 STEVAL-ILL027V1

modifications for EU voltage range” replaced by Section 3: STEVAL-

ILL027V2 demonstration board, corrected typo in Section 1: Circuit

design and Section 2: STEVAL-ILL027V1 demonstration board.