The **EVALSTDRIVE101** is a demonstration board designed by STMicroelectronics to evaluate the **STDRIVE101**, a triple half-bridge gate driver. It is primarily used for driving three-phase brushless DC (BLDC) motors in applications like power tools, drones, and industrial automation. --- ### 1. Key Electronic Components The board is divided into power stages, control logic, and protection circuits. Below is a breakdown of the primary parts: | Component Category | Part Name / Type | Function | |:---|:---|:---| | **Gate Driver IC** | **STDRIVE101** | The "brain" that controls the high-side and low-side MOSFETs. It handles 600mA source/sink current. | | **Power MOSFETs** | **STL110N10F7** | 100V, 110A N-channel MOSFETs in PowerFLAT 5x6 package (6 total for the 3-phase bridge). | | **Microcontroller (MCU)** | (External Interface) | Designed to connect to an external STM32 MCU via the ST Morpho or specialized headers. | | **Voltage Regulator** | **L78L05** | Linear regulator to provide 5V for internal logic and pull-up resistors. | | **Shunt Resistors** | Low-Ohmic Surface Mount | Used for phase current sensing (usually 3-shunt or 1-shunt configuration). | --- ### 2. Functional Sections ### A. The STDRIVE101 Gate Driver The core of the board is the STDRIVE101 IC. Its primary characteristics include: * **Three-Phase Topology:** Controls three half-bridges. * **Operating Voltage:** Supports up to 75V (60V recommended for safety margin). * **Integrated Bootstrap Diodes:** Reduces external component count. * **Protection:** Includes Under-Voltage Lockout (UVLO), Over-Temperature Protection, and Interlocking (prevents cross-conduction). ### B. Power Stage (MOSFETs) The board uses ST's **STripFET VII** technology. These MOSFETs are optimized for: * **Low RDS(on):** Minimizes heat generation during high-current operation. * **High Switching Speed:** Allows for high-frequency PWM (Pulse Width Modulation). ### C. Current Sensing The board includes a sensing network for motor control algorithms (like FOC - Field Oriented Control): * **Three Shunt Configuration:** Allows the system to measure current in each motor phase independently. * **Op-Amps:** Integrated or external operational amplifiers condition these small voltage signals before sending them to the MCU's Analog-to-Digital Converter (ADC). --- ### 3. Connection and Logic The board is equipped with several connectors to facilitate testing: ```markdown * **Power Input:** Terminals for the DC bus (VCC and Ground). * **Motor Outputs:** Three terminals (U, V, W) to connect the BLDC motor. * **Logic Header:** 2x17 pin header compatible with STM32 Nucleo boards. * **Hall Sensor Input:** A dedicated connector for motor position feedback. ``` --- ### 4. Technical Specifications Summary | Parameter | Value | |:---|:---| | Max DC Voltage | 75V | | Max Output Current | 15 Arms | | Logic Voltage | 3.3V or 5V | | PWM Frequency | Up to 100 kHz | ---