Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023, pp.912 - 918
Type
Conference Paper
ISBN
9781665475396
ISSN
2470-6647
Abstract
This paper presents a Gallium Nitride (GaN) based Point of Load (POL) DC-DC converter with a reconfigurable series-parallel (SP) hybrid topology and a programmable control chip. Depending on the input voltage (VIN) and the output current (IOUT), the converter can be reconfigured to the series capacitor buck topology for improved efficiency. The control chip integrates a digital pulse-width-modulator (PWM), a switched-mode regulation loop, a dead-time (tDEAD) controller, high voltage floating level shifters, and gate drivers. In order to achieve wide range of operation, the switching frqeuency (fSW) and on-time ratio (tONR) can be manually programmed for optimizing zero-voltage-switching (ZVS) at different IOUT. The IC prototype is fabricated in TSMC 0.18 mu m high voltage process. The converter achieves 83.7% peak efficiency and >80% efficiency over 26X load range (0.3 - 8 A) at 48-to-1 V conversion.