The UC3845BD1G is an IC (Integrated Circuit) component primarily used as a current-mode PWM (Pulse-Width Modulation) controller. Manufactured by ON Semiconductor Corporation, this device is frequently employed in power supply applications for regulating voltage levels efficiently. Here are the key features and an overview of the UC3845BD1G:
1. Control and Regulation: The UC3845BD1G acts as a versatile control circuit for designing power converters with various outputs, such as Flyback, Boost, or Buck-Boost configurations. With its current-mode control, it maintains stable regulation and provides excellent dynamic response.
2. PWM Generation: This IC generates a PWM signal based on the feedback received from the power supply's output voltage. By comparing this feedback signal with an internal reference voltage, it adjusts the duty cycle of the PWM signal, resulting in precise control of the power delivered to the load.
3. Oscillator: It incorporates an oscillator circuit that generates a precise frequency for the PWM operation. The frequency can be externally programmed using an RC (Resistor-Capacitor) circuit, offering flexibility in selecting the frequency based on the application requirements.
4. Undervoltage Lockout (UVLO): The UC3845BD1G features a built-in UVLO circuitry that prevents the IC from operating when the supply voltage falls below a specified threshold. This protection ensures proper operation and prevents potential damage during brownout or sudden supply voltage drops
