Renesas Electronics Corporation PMIC - PMIC - Voltage Regulators - DCDC Switching Controllers - ISL6551ABZ ISL6551ABZ

The ISL6551ABZ is a zero voltage switching (ZVS) full-bridge PWM controller designed for isolated power systems, capable of operating at frequencies up to 1MHz. It features a current mode control that enhances efficiency while minimizing electromagnetic interference (EMI). The controller includes high current high-side and low-side totem-pole drivers, which eliminate the need for additional external drivers for moderate gate capacitance applications. Key functionalities include programmable soft-start, adjustable resonant delay for ZVS, leading edge blanking, and dead time control. It also supports cycle-by-cycle peak current limiting and fast short-circuit protection in hiccup mode. The device is equipped with a precision bandgap reference and an error amplifier with a bandwidth of 10MHz for feedback loop compensation. The ISL6551ABZ is suitable for applications such as full-bridge and push-pull converters, as well as power supplies for high-end microprocessors and telecom/datacom systems. It is housed in a 28-lead SOIC package and is RoHS compliant. The part number ISL6551ABZ is no longer available, with the recommended replacements being ISL6551IBZ and ISL6551IBZ-T.