The UC3845BDG is an integrated circuit (IC) component that belongs to the UC384x family of pulse width modulation (PWM) controllers. It is specifically designed for controlling switch-mode power supplies (SMPS) and provides a cost-effective solution for low-power applications. Here is an overview of the key features of the UC3845BDG:
1. PWM Controller: The UC3845BDG is a versatile PWM controller that regulates the switching frequency of the power supply. It operates in a voltage mode control scheme and maintains a constant output voltage by adjusting the duty cycle of the output waveform.
2. Wide Input Voltage Range: This IC can operate within a wide input voltage range, typically from 8V to 35V. It is suitable for a variety of applications requiring different input voltage levels, including automotive, industrial, and consumer electronics.
3. Error Amplifier: The UC3845BDG features an error amplifier that compares the feedback voltage from the output with a reference voltage. It generates an error signal that is fed to the PWM comparator to adjust the duty cycle accordingly, ensuring stable voltage regulation.
4. Soft-Start Function: To prevent inrush currents during startup, the UC3845BDG implements a soft-start feature. It gradually ramps up the duty cycle after power-on, preventing excessive current draw and ensuring a smooth startup sequence
