150 W Power Factor Corrected LLC Power Supply Using HiperPLC (PLC810PG)

This engineering report describes a 150 W reference design power supply for 230 VAC
input LED street lights and also serves as a general purpose evaluation board for the
PLC810PG
The design is based on the PLC810PG controller IC which integrates both continuous
current mode (CCM) boost PFC and resonant half-bridge (LLC) control functions together
with high-side and low side drivers for the LLC stage MOSFETs. To allow optimum
design of the LLC transformer (T1) for high efficiency (high k factor – the ratio of parallel
to series inductance) the design operates in burst mode at zero load. The supply is thus
protected against output overvoltage at low/zero load, but it will not deliver a steady
output voltage at zero load. A practical LED street light power supply design that includes
an auxiliary output winding to power the LED driver circuitry may not have this limitation.
DER-212 demonstrates a design using the commonly employed single transformer and
resonant inductor magnetic component (integrated magnetics) for the LLC stage
(common in display applications). However, the PLC810 may as easily be used with
separated transformer and resonating inductor. PI design materials support both
approaches.