Design on PFM Generator IP Core for LLC Resonant Topology
This paper describes the structure and frequency characteristics of the LLC resonant topology,and a PFM generator IP core with dead-time and complementary outputs is proposed based on the domestic Seal 5000 series SA5Z-30-D1 platform to meet the demand of the LLC resonant converter for a fixed duty cycle of 50%and adjustable frequency.The proposed IP core has an up-down counting mode counter and a dead-time and complementary generation module.The maximum value and increment of the counter are set through registers,and the direction signal of the counter is fed into the dead-time and complementary generation module as the PFM output,and the inverse signals are generated and inserted into the dead-time in the dead-time and complementary generation module.Observation of the actual output signals through an oscilloscope shows that the IP core outputs good results and can flexibly output configurable PFM waveforms with dead-time and complementary outputs.
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