The UC3845BVDG is an integrated circuit (IC) component that belongs to the UCx84x family of pulse width modulation (PWM) controllers. It is specifically designed for controlling power supplies using a fixed frequency PWM voltage mode control scheme. Below is a concise overview of the key features and functionalities of the UC3845BVDG IC component.
1. Voltage Mode PWM Controller: The UC3845BVDG is a versatile PWM controller that generates a stable and regulated output voltage by controlling the duty cycle of the power switch in a power supply circuit.
2. Fixed Frequency Operation: This IC operates at a fixed frequency, eliminating the need for external frequency synchronization. The operating frequency range typically lies between 50 kHz and 500 kHz.
3. Error Amplifier: The UC3845BVDG integrates a high-gain voltage error amplifier that compares the feedback voltage (representing the output voltage) with a reference voltage to generate an error signal. This error signal is then used to adjust the duty cycle of the power switch.
4. Soft-start Capability: The IC includes a soft-start function that gradually increases the duty cycle during startup, preventing excessive inrush currents and reducing stress on the power components.
5. Adjustable Duty Cycle: The duty cycle of the power switch can be adjusted using an external resistor and capacitor. This flexibility allows customization of the power supply's output voltage and current limits
