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Tool/software:
hi expert
i saw 5156 has random spread spectrum function and support Boost/SEPIC/Flyback topology.
Q1:i want to check with you whether random spread spectrum can be used in Boost/SEPIC/Flyback?
Q2: it seems like Flyback device seldom support random spread spectrum, what is reason?
thanks
Hi Jay,
Thanks for reaching out.
Q1: Yes LM5156 has the possibility to enable DRSS. This is then independend on the used topology.
Q2: Devices that are made especially for flyback and operate quasi resonant for example, cannot use DRSS because they have to switch at a certain time. LM5156 however, is not a dedicated flyback device, but a boost controller, that can be used for flyback and SEPIC as well.
Best regards
Moritz
hi Moritz
so if 5156 is used for SEPIC or BOOST topology, DRSS can be used?
if 5156 is used for flyback, DRSS cannot be used?
am i right?
Hi Jay,
If DRSS is activated, it is always used, independend on the topology.
Best regards
Moritz