AN3303 Datasheet, PDF (1/27 Pages) STMicroelectronics – Secondary-side rectification for an LLC resonant converter

AN3303
Application note
Secondary-side rectification for an LLC resonant converter
featuring the SRK2000
Introduction
The EVLSRK2000 is a family of demonstration boards designed for the evaluation of the
SRK2000 in LLC resonant converters with synchronous rectification (SR).
The first part of this application note is a brief description of the IC features while the second
is dedicated to the board description. Finally, some considerations regarding circuit
optimization and performance are given.
This board was realized in four different configurations depending on the mounted SR
MOSFETs. Different board codes are shown in Table 1:
Table 1. Demonstration board ordering codes
Ordering code SR MOSFET P/N
MOSFET
package
EVLSRK2000-L-40 STL140N4LLF5
PowerFLAT™
EVLSRK2000-L-60
STL85N6F3
PowerFLAT™
EVLSRK2000-D-40
EVLSRK2000-S-40
STD95N4F3
STS15N4LLF3
DPAK
SO-8
MOSFET R_DS(on) MOSFET BV_DSS
2.75 mΩ
5.70 mΩ
5.80 mΩ
5.00 mΩ
40 V
60 V
40 V
40 V
Figure 1. EVLSRK2000: smart driving control for an LLC resonant converter
September 2011
Doc ID 18164 Rev 2
1/27
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