UC3845G-S08-R

The UC3845G-S08-R is a high-performance integrated circuit (IC) designed for use in power management applications, particularly in switch-mode power supplies (SMPS). Manufactured by Unisonic Technologies, this IC is part of the UC384x family, which is known for its efficiency and reliability in controlling power conversion processes.

Key Features:

1. Functionality: The UC3845G-S08-R is primarily a current-mode PWM (Pulse Width Modulation) controller. It is designed to regulate output voltage and current in power supply circuits, making it suitable for various applications, including DC-DC converters and off-line power supplies.

2. Operating Voltage: The IC operates over a wide input voltage range, typically from 8V to 30V, allowing it to be used in various power supply designs.

3. Frequency: It features a fixed oscillator frequency, which can be set to a specific value, typically around 100 kHz. This frequency is crucial for determining the size of passive components in the power supply design.

4. Current Sensing: The UC3845G-S08-R includes a built-in current sensing feature that allows for accurate control of the output current, enhancing the overall performance and safety of the power supply.

5. Soft Start: The IC incorporates a soft-start function, which gradually ramps up the output voltage to prevent inrush current during startup, protecting both the power supply and the connected load.

6. Protection Features: It includes several protection mechanisms, such as over-voltage protection (OVP), under-voltage lockout (UVLO), and thermal shutdown, ensuring safe operation under various conditions.

7. Package Type: The UC3845G-S08-R is typically available in an 8-pin DIP (Dual In-line Package) or SOIC (Small Outline Integrated Circuit) package, making it easy to integrate into various circuit designs.

8. Temperature Range: The IC is designed to operate over a wide temperature range, typically from -40°C to +85°C, making it suitable for industrial and consumer applications.

Applications:

The UC3845G-S08-R is widely used in applications such as:

• AC-DC power supplies
• DC-DC converters
• Battery chargers
• LED drivers
• Telecom power supplies

Conclusion:

Overall, the UC3845G-S08-R from Unisonic is a versatile and efficient PWM controller that provides essential features for modern power supply designs. Its combination of performance, protection features, and ease of use makes it a popular choice among engineers and designers in the field of power electronics.