TRINAMIC Motion Control has launched a line of discrete MOSFET integrated circuits specifically designed to complement the company's motor drive pre-driver ICs. The new full- and half-bridge MOSFET packages are designed for driving stepper motors that require peak coil currents between 2.5A and 5A at voltages between 30V and 60V. Matched with TRINAMICs TMC262 stepper driver, the new MOSFETs are suited for motors sized between NEMA 24 and 34, which typically deliver from 1.1 to 4.4 ft.-lbs. of torque. TRINAMICs MOSFETs and pre-driver IC have been designed and matched to deliver minimal power and heat dissipation, enabling designers to achieve highly concise PCB designs.
TRINAMICs discrete MOSFETs use CMOS technology, with RDS (on) figures between 40 and 70 milliohms. This compares with integrated driver IC MOSFETs that require the use of BCDMOS technology, which results in typical RDS (on) figures between 200 and 600 milliohms. Consequently, integrated driver/MOSFET combinations are only suitable for relatively low current ranges, while discrete MOSFET motor drives can support much higher voltage/current combinations.
The RDS (on) performance of discrete MOSFETs delivers considerably better power efficiency and lower heat dissipation. By partitioning the motor pre-driver and power MOSFET bridges into discrete components, designers enjoy greater flexibility in board layout to satisfy both space constraints and power dissipation requirements. TRINAMIC offers several proven layouts that minimize board space and heat dissipation.
TRINAMICs MOSFET products are sold as a comprehensive motor drive bundle, complete with a TMC262 pre-driver IC and 2 full- or 4 half-bridge MOSFETs.