The BD9851EFV is a DC/DC converter controller manufactured by Rohm Semiconductor. It is designed for use in applications requiring a highly efficient step-down (buck) conversion from a higher input voltage to a lower, regulated output voltage. This controller utilizes a PWM (Pulse Width Modulation) control scheme to achieve high efficiency and stable voltage regulation. It is typically used in power supplies for LCD TVs, monitors, and other similar applications.

Applications

• Power supplies for LCD TVs
• Power supplies for LCD Monitors
• Power supplies for Set-Top Boxes
• Power supplies for DVD Players
• General-purpose DC/DC Conversion

Features

• PWM Control: Uses Pulse Width Modulation for efficient power conversion.
• Overcurrent Protection (OCP): Protects the controller and the load from excessive current.
• Overvoltage Protection (OVP): Protects the load from excessive output voltage.
• Short Circuit Protection (SCP): Shuts down the controller in the event of a short circuit.
• Under Voltage Lockout (UVLO): Prevents operation when the input voltage is too low.
• Adjustable Output Voltage: Allows for customization of the output voltage to suit different application requirements.

Benefits

• High Efficiency: PWM control ensures efficient power conversion, reducing heat generation and extending battery life in portable devices.
• Reliable Operation: Comprehensive protection features safeguard the controller and load from damage.
• Stable Output Voltage: Provides a consistent and regulated output voltage, improving the performance of connected devices.
• Versatile Application: Adjustable output voltage allows for use in a wide range of applications.
• Safety Features: Overvoltage and undervoltage lockout enhances the overall safety and stability of power supply.

The BD9851EFV is ideally suited for applications requiring high efficiency, robust protection features, and stable voltage regulation. Its adjustable output voltage provides flexibility in design, making it suitable for various applications. The internal protection features ensure reliable operation even under fault conditions. The device typically operates at a high switching frequency, allowing for the use of smaller external components, reducing overall system size. Furthermore, soft-start functionality is often incorporated to limit inrush current during startup, further enhancing the robustness of the design.