STMicroelectronics STNRG328S | Demoboard AN5810

Description

his application note describes the 54 V input, 13.5 V unregulated output (54 V divided by 4), 500 W, 98% efficient, switchedtank converter based on the STNRG328S digital controller and four STPRDC02A full bridge MOSFET drivers tailored to atypical 12 V bus generation in computer and server applications.The STC is an open loop resonant converter that performs a power conversion from an input voltage to an output voltage witha fixed duty cycle. The zero current detection feature allows synchronization with the real resonant LC frequently in case of fullX7R capacitors used.The power section scheme is composed of an LC resonant network, flying MOSFETs and rectification MOSFETs driven by fourSTPRDC02A full bridge MOSFET drivers with ZCD.The STNRG328S is a “State Machine Event Driven” (SMED) digital controller and it implements the STC control strategy andthe necessary functions. Various control actions are required to ensure the proper architecture behavior and best performanceswith ZCD (Zero Current Detection).Additional components have been used to implement the functions controlled by the SMED digital engine (drivers, hot swap,charge pump, etc.). Populating passive power components only on the top side for 500 W, instead of both sides for 1 KW.

Typical applications

• Computer and server applications

More information

• Datasheet
• IC product information