STMicroelectronics STDRIVE102H
STDRIVE102H - Triple half-bridge gate driver with programmable currents
The STDRIVE102BH and the STDRIVE102H are triple half-bridge gate drivers suitable for 3-phase brushless motor driving.
The STDRIVE102BH/H is the optimal solution for battery supplied motor driver applications such as power tools, vacuum cleaner and small appliances thanks to its very efficient stand-by mode, that strongly reduce 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 of external gate resistors. The different configurations of the drivers can be selected through two analog pins (IGATE and TCC).
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 STDRIVE102BH integrates three operational amplifiers and three comparators, the STDRIVE102H integrates one operational amplifier and two comparators. In a typical application, the operational amplifiers can be used to monitor the voltage across the shunt resistor(s) sensing the current flowing in the motor phases. 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 a VDS monitoring on both high-side and low-side MOSFETs. In case a protection is triggered, the nFAULT open-drain pin signals the event. The STDRIVE102BH has another dedicated open-drain pin (FLAG) which indicates whether the gate driver supply VCC falls below the guard limit. The device integrates a smart shutdown function which allows immediate turn-off of the outputs of the gate driver in the case of fault, by minimizing the propagation delay between the fault detection event and the actual output switch-off.
In addition to the main supply pin (VS), the STDRIVE102BH/H has dedicated pin VM, which should be connected to the motor supply voltage, in correspondence of 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 device’s flexibility, the VS and VM pin can operate at different voltages.
Features
- Operating voltage from 6 to 50 V
- Gate drivers with programmable current capability up to:
- 1 A source current
- 2 A sink current
- High robustness against below-ground and overshoot
- Charge pump for 100 % duty cycle operation with dedicated undervoltage lockout protection
- Flexible power management:
- 12 V LDO linear regulator with dedicated undervoltage lockout protection
- 3.3 V LDO linear regulator with dedicated undervoltage lockout protection
- Standby mode for low consumption less than 50 nA
- Thermal shutdown protection
- VDS monitoring for safe driving operation of the power MOSFETs
- Flexible analog front-end:
- Up to three wide-bandwidth operational amplifiers
- Up to three high-speed comparators
- Dual control modes:
- ENx/INx
- INHx/INLX with interlocking
- Matched propagation delay for all channels
- Logic inputs up to 5 V, TTL compatible
Applications
- Battery supplied power tools
- Portable vacuum cleaners
- E-bikes
- Industrial automation
- Robotics
- Pumps and fans
EVLDRIVE102H - STDRIVE102H evaluation board for three-phase brushless motors
The EVLDRIVE102H evaluation board is a three-phase inverter based on the STL220N6F7 power MOSFETs. This evaluation board allows a full evaluation of the features of the STDRIVE102H, a triple half-bridge gate driver.
The power stage uses a single shunt topology: the current sensing and the overcurrent protections are implemented using one operational amplifier and one comparator embedded in the STDRIVE102H.
The embedded protections of the STDRIVE102H, such as the UVLO on the driving voltage and the VDS monitoring for each power MOSFET, ensure a safe driving operation of the power stage.
The EVLDRIVE102H evaluation board is thermally protected by exploiting both the hardware thermal shutdown protection embedded in the STDRIVE102H and also an onboard NTC sensor placed close to the power stage. The NTC is connected to the second comparator embedded in the STDRIVE102H, thus implementing a second hardware protection according to the power stage temperature.
The nFAULT diagnostic pin of the STDRIVE102H, is connected to the control board and to an LED indicator, which lights on whenever a protection is triggered.
The EVLDRIVE102H evaluation board can support FOC and six-step motion control algorithms. In case the motor is equipped with positioning sensors, they can be connected to the connector for Hall-effect based sensors and for the encoder, in order to increase the precision of the control algorithms. Nevertheless, sensorless control algorithms can be implemented as well: each output phase of the inverter has a read-out network, which allows the sensing of the phase voltage/BEMF of the motor. In addition, the bus voltage sensing present on the board ensures that the control algorithms are properly implemented.
The EVLDRIVE102H evaluation board is compatible with a wide range of Nucleo control boards, thus allowing the evaluation of the STDRIVE102H together with different STM32 microcontrollers.
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