ISL78225EVAL1Z 4-Phase Interleaved Synchronous Boost Converter
The ISL78225EVAL1Z evaluation board features the ISL78225 4-phase interleaved boost controller and four ISL78420 100V MOSFET drivers. The ISL78225 and ISL78420s are configured as a 4-phase synchronous boost converter for 10V to 16V input into 36V output at 10A. The interleaved timing reduces input and output ripple current, thereby reducing the required number of input and output capacitors.
The ISL78225 enhances light load efficiency by dropping phases with decreasing load, by emulating a diode while stopping reverse current in the synchronous output switch, and by skipping switch pulses at very light loads. The ISL78420 facilitates diode emulation by translating the midrange of the tri-level PWM out from the ISL78225 to turn both output switches off.
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