Toshiba Announces Sample Availability of Gate Driver for Bridge Circuits Driving High-Current ......
Toshiba Electronic Devices & Storage Corporation
("Toshiba") has started providing engineering samples of “TB9104FTG,”
a gate driver[1] for bridge circuits used in high-current automotive brushed DC
motors, suitable for body system applications such as power back doors, power
sliding doors, and power seats.
The accelerating electrification of movable components in vehicles
has increased the number of motors installed in vehicles, particularly motors
for body system applications. This trend has also increased the number of
drivers required for motor operation, and is creating demand for more compact
systems. Wire harnesses must be reduced to meet requirements for lighter
vehicles
TB9104FTG adopts a small VQFN32 package with typical dimensions of
5.0mm×5.0mm. An exposed thermal pad on the underside of the package enhances
thermal performance, and when combined with external MOSFETs, this enables a
compact drive circuit for high-current brushed DC motors in body system
applications.
The new product has a serial peripheral interface (SPI) for interfacing
with microcontrollers, providing numerous configuration options and status
information. Notably, rotation commands for the motor can be issued not only
through dedicated pins but also via SPI. By connecting multiple gate drivers to
the SPI bus, wiring can be shared, contributing to wire harness reduction.
TB9104FTG also features a built-in PWM drive circuit. Designed for
environments with multiple devices connected via SPI, it enables continuous
motor operation based on a preset PWM drive cycle with just a single rotation
command from the microcontroller. This helps reduce the load on the
microcontroller and alleviates congestion on the SPI bus.
As a device handling high current, TB9104FTG ensures safety by
integrating a high-precision current sense amplifier that monitors motor drive
current. By feeding the amplifier’s output back to the microcontroller, precise
drive-stop control can be executed when abnormal current occurs. The product
also features other abnormality detection and drive-stop functions.
Toshiba will expand the lineup of driver ICs for automotive
motors, contributing to the electrification and enhanced safety of automotive
equipment.
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