Product Overview
The STMicroelectronics L6230QTR is a highly integrated DMOS (Double-diffused MOSFET) full triple half-bridge driver designed primarily for three-phase brushless DC (BLDC) motor and permanent magnet synchronous motor (PMSM) applications. Housed in a compact 32-lead VFQFPN (Very Thin Quad Flat Package No Lead), this device delivers efficient control and high current handling in a compact form factor. It is particularly well-suited for applications requiring efficient, reliable, and compact motor driving, such as robotics, industrial automation, precision instrumentation, and home appliances.

Architecture and Functional Description
The L6230QTR integrates three full half-bridge drivers, providing the complete power stage necessary to drive three-phase motors. It uses DMOS transistors for both high-side and low-side switches, offering low RDS(on) and high efficiency. The integrated bootstrap diodes and circuitry allow high-side driving without external components, minimizing BOM count. An internal logic section interfaces with an external microcontroller or DSP via standard logic inputs to control the commutation.

Additionally, it features integrated protection mechanisms such as overcurrent protection (OCP), thermal shutdown (TSD), undervoltage lockout (UVLO), and cross-conduction prevention.

Key Features

* Triple half-bridge architecture for three-phase motor control
* 2.8 A RMS output current capability per phase
* Integrated bootstrap diodes for high-side gate driving
* Low RDS(on) DMOS power stage for high efficiency
* Overcurrent, thermal, and undervoltage protections
* Cross-conduction prevention logic
* Current sensing via external low-side shunt resistors
* Direction and PWM input control scheme
* Integrated fast diode for inductive load recirculation
* Operating voltage up to 52 V

Electrical Specifications

* Supply Voltage Range (V\_s): 7 V to 52 V
* Logic Supply Voltage (V\_LS): 3.3 V to 5 V
* Output Current (RMS): 2.8 A (typical) continuous per phase
* Peak Output Current: Up to 5.6 A for short duration (thermal limited)
* On-resistance (RDS(on)):

* High-side: ~0.73 Ω (typ)
* Low-side: ~0.55 Ω (typ)
* Quiescent Supply Current: ~5 mA (typ)
* PWM Frequency Range: Up to 100 kHz (typical supported operation range)
* Logic Input Thresholds:

* VIH: ≥2.4 V
* VIL: ≤0.8 V

Thermal and Mechanical Characteristics

* Package: VFQFPN-32L (5 mm x 5 mm)
* Thermal Resistance (Junction-to-Ambient): ~40 °C/W (typ with PCB heatsinking)
* Maximum Junction Temperature: 150 °C
* Operating Ambient Temperature Range: -40 °C to +150 °C
* ESD Protection: > 2 kV (HBM) on all pins

Protection Features

* Overcurrent Protection (OCP):

* Monitors the voltage drop across external shunt resistors
* Activates when current exceeds set thresholds
* Thermal Shutdown (TSD):

* Automatically disables outputs if junction temperature exceeds 150 °C
* Undervoltage Lockout (UVLO):

* Disables outputs when the supply voltage drops below 6 V
* Cross-conduction Protection:

* Ensures that both high-side and low-side transistors are not on simultaneously
* Fast Diode Clamp:

* For energy recirculation during phase switching or braking events

Control Interface and Operation

* Input Logic: TTL/CMOS compatible
* Input Pins:

* Six logic inputs (IN1-IN3, EN1-EN3) to control each half-bridge
* DIAG pin for fault reporting
* VREF pin for controlling current regulation
* SENSE A/B/C for current sensing
* Current Sensing:

* External low-value resistors used at SENSE pins
* Useful for current control loops and implementing protections
* Control Modes Supported:

* Commutation with Hall sensors
* Sensorless control (via microcontroller implementation)
* PWM/direction control with integrated dead-time handling

Applications

* Three-Phase BLDC Motor Drivers:

* Robotics, industrial fans, gimbals, drones
* Permanent Magnet Synchronous Motors (PMSM):

* HVAC, white goods, washing machines
* Servo Drives and Positioning Systems:

* Printers, automation machinery
* Battery-Operated Motor Control:

* Electric scooters, power tools
* Appliance and Consumer Products:

* High-efficiency compressors, air conditioners

Design Considerations

* A proper PCB layout is critical to ensure thermal performance and current handling; use of wide copper traces and ground planes is recommended.
* The SENSE pins should be connected to precision low-ohm resistors to enable accurate current measurements.
* Bootstrap capacitor values typically range from 100 nF to 220 nF, located close to the IC for fast switching and high-side drive performance.
* External logic signals must be synchronized to prevent shoot-through conditions, although the chip includes internal dead-time logic.

Summary of Key Specifications

* Device Type: Triple Half-Bridge DMOS Driver
* Operating Voltage Range: 7 V – 52 V
* Output Current: 2.8 A RMS per phase
* Peak Current: 5.6 A
* RDS(on): High-side: 0.73 Ω; Low-side: 0.55 Ω
* Control Inputs: Logic-level, TTL/CMOS compatible
* Protection: OCP, TSD, UVLO, cross-conduction
* Package: VFQFPN-32 (5x5 mm)
* Applications: BLDC/PMSM motors, servo drives, robotics, white goods

Conclusion
The STMicroelectronics L6230QTR is a robust and feature-rich motor driver IC ideal for precision three-phase motor control in space-constrained and power-efficient systems. It integrates key functionalities such as power stage switching, current sensing, protection, and bootstrap management, reducing external component count and design complexity. Its capability to handle up to 2.8 A continuous current per phase and operate across a wide voltage and temperature range makes it suitable for high-performance applications in industrial, consumer, and automotive segments.