72V Motor Driver with Integrated Voltage Feed
Elmos Semiconductor introduces component E523.50, a threefold 72V half-bridge driver for brushless dc (BLDC) motors. Feasible are automotive applications with 24- and 48-V onboard power supply and industrial applications with 24- to 60-V power supplies. The device complies with AEC-Q100, Grade 0 requirements.
The high-voltage input, a digital RUN pin and six digital inputs control the three half-bridge gate drivers (three high side and three low side gate drivers). The IC is configurable for six direct control inputs or three enable and three pwm inputs. In the latter case, the dead time is generated automatically and can be adjusted using an external resistor.
The component has an integrated dc-dc step-down (buck) converter, which provides the drivers with a gate voltage of 11V/100mA. The internal 3.3V control unit is able to supply the microcontroller with 20mA. Users may connect an external transistor for higher loads.
Among the component characteristics are comprehensive diagnostics and protective features. Two error outputs show any over-current, low voltage and excessive temperature rise. The excellent heat transfer properties of the exposed-pad QFN36L7 housing make it possible to operate the IC close to its maximum permissible temperature of 150 degrees C.
