## Overview of the L6393D The **L6393D** is a high-voltage device manufactured by STMicroelectronics. It is specifically designed as a **high-voltage half-bridge gate driver**, fabricated with the BCD™ "offline" technology. This chip is primarily used to drive N-channel power MOSFETs or IGBTs. --- ### Key Technical Specifications | Feature | Description | | :--- | :--- | | **High-side Voltage** | Up to 600 V | | **Output Current** | 270 mA source / 430 mA sink (typical) | | **Supply Voltage (Vcc)** | 10 V to 20 V | | **Logic Inputs** | 3.3 V and 5 V compatible | | **Package Type** | SO-8 or DIP-8 | | **Integrated Function** | Smart shutdown, Internal Deadtime, Bootstrap diode | --- ### Major Functional Components The L6393D consists of several internal blocks that handle signal processing and power delivery: 1. **Dual Input Pins (HIN and LIN):** The device features two independent input pins to control the high-side and low-side outputs. It includes an **interlocking function** to prevent both outputs from being high simultaneously (preventing short circuits). 2. **Integrated Bootstrap Diode:** Unlike older gate drivers, the L6393D includes an internal high-voltage bootstrap diode. This reduces component count and PCB space when creating the floating supply for the high-side driver. 3. **Smart SD (Shutdown) Function:** This pin acts as a multi-function input/output. It provides an ultra-fast fault protection mechanism. When a fault is detected (like overcurrent via an external comparator), the device shuts down the gate outputs instantly. 4. **Deadtime Generator:** To prevent "shoot-through" (where both transistors in a half-bridge are on at once), the chip automatically inserts a **deadtime** of approximately 310 ns. --- ### Pin Configuration | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **VCC** | Low-side and logic supply voltage | | 2 | **HIN** | High-side driver logic input | | 3 | **LIN** | Low-side driver logic input | | 4 | **DT/SD** | Deadtime setting or Shutdown input | | 5 | **GND** | Logic and power ground | | 6 | **LVG** | Low-side gate driver output | | 7 | **OUT** | High-side floating reference (Bridge) | | 8 | **HVG** | High-side gate driver output | | 9 | **VBOOT** | Floating supply voltage | --- ### Typical Applications * **Motor Control:** Driving 3-phase brushless DC (BLDC) motors or induction motors. * **Inverters:** Pure sine wave or modified sine wave power inverters. * **SMPS:** High-frequency switch-mode power supplies. * **Lighting:** Electronic ballasts for HID or fluorescent lamps.