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Introduction, characteristics, and applications of Texas Instruments DRV8334 integrated smart gate driver

2/23/2024 9:30:00 AM

Summary: These drives are designed for three-phase brushless DC motor (BLDC) applications.


Texas Instruments DRV8334 integrated smart gate driver is designed for three-phase brushless DC applications. The device provides three half-bridge gate drivers, each capable of driving high-side and low-side n-channel power MOSFETs. The DRV8334 uses an integrated bootstrap diode and GVDD charge pump to generate the correct gate drive voltage. The smart gate drive architecture supports configurable peak gate drive current from 0.7mA to 1A source and 2A sink. The DRV8334 can operate from a single supply and has a wide input range of 4.5V to 60V. The trickle charge pump allows the gate driver to support 100% PWM duty cycle control and provides overspeed gate drive voltage to external switches.

Texas Instruments DRV8334 provides a low-side current sense amplifier that supports resistor-based low-side current sensing. The amplifier's low offset enables the system to obtain accurate motor current measurements. The DRV8334 integrates extensive diagnostic and protection features, enabling robust motor drive system designs and helping to eliminate the need for external components. Highly configurable device response allows the device to be seamlessly integrated into a variety of system designs.


characteristic

  • Three-phase half-bridge gate driver

    • Drives 6 n-channel mosfets (NMOS)

    • 4.5V to 60V wide operating voltage range

    • Bootstrap architecture for high-side gate drivers

    • Powerful GVDD charge pump supports up to 50mA average gate switching current, enabling driving 400nC mosfets at 20kHz

    • Trickle charge pump supports 100% PWM duty cycle and generates overspeed supply to drive external cutoff or reverse polarity protection circuitry

  • Smart gate drive architecture

    • 45 levels of configurable peak gate drive current up to 1000mA/2000mA (source/sink)

    • Three-step drive current configuration optimizes charge and discharge cycles and reduces dead time

    • Closed-loop automatic dead zone insertion based on gate-source voltage monitoring

    • Configurable soft shutdown to minimize induced voltage spikes during overcurrent shutdown

  • Low-Side Current Sense Amplifier

    • Low input bias below 1mv across temperature

    • 9 levels of adjustable gain

  • Detailed configuration and diagnostics based on spi

  • DRVOFF pin individually disables driver

  • High voltage wake-up pin (nSLEEP)

  • 6x, 3x, 1x and independent PWM modes

  • Supports 3.3V and 5V logic input

  • Comprehensive protection functions

    • Battery and mains voltage monitor

    • Phase feedback comparator

    • MOSFET V(DS) and R(Sense) Overcurrent Monitor

    • MOSFET V(GS) Gate Fault Monitor

    • Equipment thermal alarm and shutdown

    • Fault status indicator pin


app

  • Home appliances, cordless garden and power tools, lawn mowers

  • Brushless DC (BLDC) Motor Modules and PMSMs

  • Fans, pumps and servo drives

  • E-bikes, e-scooters and e-mobility

  • cordless vacuum cleaner

  • Drones, industrial and logistics robots, remote control toys


Simplified schematic


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