STDRIVE102BP

The STDRIVE102BP and the STDRIVE102P are triple half-bridge gate drivers suitable for 3-phase brushless motor driving.

The STDRIVE102BP/P is the optimal solution for battery-supplied motor driver applications such as power tools, vacuum cleaners and small appliances thanks to its very efficient standby mode, which strongly reduces the current consumption when the device is not active.

The gate drivers are designed to drive, with a programmable gate current, six external N-channel power MOSFETs, allowing a superior performance of the power stage and regulating the slew rate of power outputs without the need for external gate resistors. The gate current and the other configurations of the drivers are set through the SPI interface.

An integrated charge pump supplies the three high-side drivers, enabling unlimited on-time of the high-side MOSFETs.

An embedded 12 V LDO linear regulator provides the supply of the three low-side drivers and its output is available on the VCC pin, to also supply external loads.

Another LDO linear regulator provides a 3.3 V on the VDD pin to supply external low-voltage components and the embedded analog front end (AFE), which has a different configuration, depending on the device part number. The STDRIVE102BP integrates three programmable-gain amplifiers (PGAs) and three comparators, while the STDRIVE102P integrates one programmable-gain amplifier and one comparator. In a typical application, the PGAs can be used to amplify the current in each phase of the motor by monitoring the voltage across the shunt resistors on each low-side MOSFET. Concurrently, the comparators can be used to detect dangerous overcurrent conditions.

A full set of embedded protections is present to increase the overall application robustness: undervoltage lockout (UVLO) on each supply (VCC, VDD, and charge pump voltage), thermal shutdown, and the VDS monitoring on both high-side and low-side MOSFETs.

In case a protection is triggered, the nFAULT and FLAG (STDRIVE102PB only) open-drain pins can be configured to signal which specific protection event has been triggered. Both the nFAULT and FLAG pins can be used in combination with the EN pin to implement an automatic rearm after a protection event.

In addition to the main supply pin (VS), the STDRIVE102BP/P has a dedicated pin VM, which should be connected to the motor supply voltage, in correspondence with the drains of the high side N-channel MOSFETs. The VM pin is used for the integrated VDS monitoring as well as a reference voltage for the charge pump. To increase the device’s flexibility, the VS and VM pin can operate at different voltages.

Both STDRIVE102BP and STDRIVE102P provide full configuration and diagnostics through a set of internal registers (accessible via the SPI interface).