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.
- Interleave solutions with two converters for low output ripple
- Good current sharing performance between two phases
- High to 91% efficiency at 400-W output
- Only 250mV peak to peak ripple at 200-400-W transient