DATASHEET
ISL78226 FN8887
Rev.2.00
Oct 19, 2017 6-Phase 12V/48V Bidirectional Synchronous PWM Controller
The ISL78226 is a 6-phase, bidirectional, synchronous PWM
controller designed to perform power conversion between 12V
and 48V buses up to 3.75kW at >95% conversion efficiency.
One ISL78226 supports both Buck and Boost power
conversion enabling a compact and robust design with
minimum components.
ISL78226 regulates both voltage and current to control power
transfer from bus to bus. The multiphase architecture uses
interleaved timing to support up to six parallel power stages
per ISL78226. By interleaving the power stages, the ripple
frequency is multiplied, reducing input and output ripple
voltage and current. Lower ripple results in fewer input/output
capacitors and therefore, lower component cost and smaller
circuit implementation. Features 6-phase bidirectional synchronous 12V to 48V controller Master/slave architecture supports up to 4 ICs in parallel Voltage and current regulation Phase dropping facilitated with companion FET driver Average phase-to-phase current balancing 2% current monitor gain accuracy from 0 to full load Supply and clock redundancy for functional safety Cycle-by-cycle peak current limiting Cycle-by-cycle negative current limiting Digitally programmable average current limit The IC is designed to be interleaved in a master/slave
architecture to be scaleable for higher power. Also integrated
within the device is a dual-output Flyback controller that
generates both a 12V supply for the power stage FET drivers as
well as a 6V supply for the ISL78226 from either of the two
buses. A 200mA auxiliary linear regulator is provided to supply …