Description

This reference design is a 300-W power output interleaving combination of two boost converters using LM5155 controller. Each converter outputs continuous 150-W and 200-W peak. A LMC555 circuit generates 150k-Hz square wave signal and its anti-phase signal for synchronous clock for the two LM5155: making two converters working with 180 ° phase shift: which helps reduce the output voltage ripple. An amplifier samples input current of the two converters: outputs error signal VC to control slave phase to share current with master phase. There is only 4.6 °C temperature difference between two phases in the thermal result: good current sharing is achieved. Efficiency of the design is higher than 91% at 400-W peak output. Peak to peak ripple is within 250-mV during 200-W to 400-W transient. The design shows a valid way to expand the output power by paralleling two boost converters.