SPRADQ1 February 2025 TMS320F2800133 , TMS320F2800135 , TMS320F2800137 , TMS320F2800155 , TMS320F2800157 , TMS320F280025C , TMS320F280037C-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280045 , TMS320F280049 , TMS320F280049C , TMS320F28P559SJ-Q1
To maximize efficiency and power density, there is a trend with using triangular current mode (TCM) totem pole PFCs with GaN to push for high switching frequency in power design. However, there are also challenges in the software control logic and the hardware circuit design. This application note discusses how to design robust PWM control logic with C2000™ microcontrollers and simplify the hardware circuits with the intelligent features of TI GaN.
C2000™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
Requirements for PFCs have undergone considerable changes over the last few years due to increasing demands for smaller size and higher efficiency. The challenge to meet premium levels of 80 plus standards requires very high efficiency over wide operating input and output ranges. This requirement for high efficiency has generated considerable interest in bridgeless topologies for the PFC stage (including totem pole PFC) that can push efficiency above 99%. Compared with hard switching control, a TCM totem pole PFC is increasingly popular due to the merits of zero-voltage switching (ZVS). With the addition of a gallium nitride (GaN) high electron mobility transistor (HEMT), the switching frequency of the TCM totem pole PFC can be pushed to MHz. To optimize system performance, TI also released intelligent GaN with integrated zero crossing detection (ZCD) functions to help reduce BOM cost and simplify software control.
This paper discusses how to leverage advanced features of the C2000 microcontroller (MCU) and the ZCD features of TI GaN to achieve robust and simple software control and system design, including techniques on how to implement interleaving control.
