The **MP191** is a high-frequency, half-bridge N-channel power MOSFET driver. It is specifically designed to drive two N-Channel MOSFETs in a high-side/low-side configuration, commonly found in motor control and power conversion applications. --- ## 1. Key Specifications and Features | Feature | Specification / Detail | | :--- | :--- | | **Input Voltage Range** | Up to 100V (High-side bootstrap voltage) | | **Gate Drive Voltage** | 4V to 14V | | **Peak Output Current** | ~2.5A Pull-up / ~3.0A Pull-down | | **Switching Frequency** | Support for high-speed switching (up to 1MHz) | | **Quiescent Current** | Low power consumption (μA range when disabled) | | **Dead Time Control** | Integrated cross-conduction protection | | **Package Types** | Often available in SOIC-8 or WLCSP | --- ## 2. Pinout Configuration The MP191 typically utilizes an 8-pin layout. Below is a standard functional description: 1. **VDD**: Power supply for the low-side gate driver and internal logic. 2. **BST (Bootstrap)**: High-side floating supply. A capacitor is connected between BST and HS. 3. **HI (High Input)**: Logic input for the high-side gate driver. 4. **LI (Low Input)**: Logic input for the low-side gate driver. 5. **HO (High Output)**: Gate drive output for the high-side N-channel MOSFET. 6. **HS (High Source)**: Return path for the high-side gate driver (connected to the MOSFET source). 7. **LO (Low Output)**: Gate drive output for the low-side N-channel MOSFET. 8. **VSS / GND**: Ground reference. --- ## 3. Internal Block Diagram Logic The MP191 operates based on these primary internal sections: ### High-Side Driver Uses a **Bootstrap Circuit**. Because the high-side MOSFET's source voltage "floats" to the rail voltage when turned on, the gate must be driven higher than the rail. The MP191 uses an external diode and capacitor to "lift" the voltage for the high-side gate. ### Level Shifter Translates the low-voltage logic signals (from a Microcontroller) to the high-voltage floating rail required by the high-side driver. ### Shoot-Through Protection Includes internal logic to ensure the high-side and low-side MOSFETs are never turned on simultaneously, which would cause a short circuit (shoot-through) across the power rails. --- ## 4. Typical Application Circuit ```mermaid graph LR PWM_Signal -->|HI/LI| MP191 VDD -->|Supply| MP191 MP191 -->|HO| MOSFET_High MP191 -->|LO| MOSFET_Low MOSFET_High --> Phase_Node MOSFET_Low --> Phase_Node Phase_Node --> Motor/Inductor ``` --- ## 5. Applications * **Half-Bridge Class-D Audio Amplifiers**: For driving output stages. * **Motor Drivers**: Specifically BLDC (Brushless DC) motor control. * **DC-DC Converters**: Synchronous Buck or Boost converters. * **Telecom Power Supplies**: High-density power modules.