Rohm
Gate Drivers: Reduce FET Heat and Suppress EMI
Rohm has developed the »BD67871MWV-Z« three-phase brushless DC motor gate driver for 12 to 48V systems. By incorporating Rohm’s proprietary gate drive technology TriC3, it greatly reduces FET’s switching loss while maintaining low EMI – traditionally a trade-off in motor driver ICs.
Motors account for approximately 60% of global electricity consumption – making control technology which affects energy efficiency increasingly critical. In 12V to 48V motor drive applications, a simple configuration where an MCU controls three gate drivers has been the mainstream. However, in recent years, demands for high efficiency and precise control have grown, accelerating the adoption of solutions combining an MCU with an integrated three-phase motor driver. Further, a technical challenge in three-phase motor drivers has been the trade-off between »power consumption reduction” and “noise / EMI (electro-magnetic interference) reduction«.
BD67871MWV-Z features Rohm's proprietary Active Gate Drive technology »TriC3«, which rapidly senses voltage information from the external power FETs and adjust gate drive current accordingly in real-time. This greatly reduces FETs’ switching loss (and hence heat generation) FET power consumption during switching while simultaneously suppressing ringing to achieve low EMI.
Compared to Rohm's conventional constant-current drive products, TriC3 gate drive has been demonstrated in actual motors that FET heat generation by approximately 35% while maintaining equivalent EMI levels. Furthermore, BD67871MWV-Z adopts UQFN28 package and pin layout which are commonly used in motor driver ICs for medium-voltage industrial equipment applications, contributing to reduced engineering effort required in circuit modifications and new designs.
Rohm supports the application development with its evaluation board (BD67871MWV-EVK-003).
TriC3
A multi-step constant current drive technology developed by Rohm. By controlling gate current in three steps, it achieves high-speed, high-efficiency operation while minimizing EMI by suppressing ringing.
