1 Introduction

Typical PDLC applications require an AC voltage in the range of 15-100V at 50-60Hz although the exact voltage and switching frequencies heavily depend on material thickness and desired switching speeds. There are many ways to power a PDLC application. The most common way adopts a discrete approach where a microcontroller, high voltage MOSFET drivers and external power stage realize the AC output voltage at the desired frequency. PDLC power stage circuits today are bulky and have high BOM costs. The PDLC dual-buck configuration presented here can replace the old application circuit using fewer, less expensive components. Additionally in the dual-buck configuration, the LM6565X5 is designed to minimize the number of external components by including output capacitors and integrating loop compensation into the power stage buck regulators.