TI recommends a 4-layer PCB with a solid ground plane, and placing the IC close to the input capacitors and output inductors. Additionally, keep the high-current paths short and use a common ground point for the input and output returns.
To ensure stability, ensure the compensation components (R1, R2, C1, and C2) are correctly selected and placed close to the IC. Also, make sure the output voltage is within the recommended range, and the input voltage is above the minimum specified value.
The maximum allowable voltage drop across the sense resistor (Rs) is typically around 100-200 mV. Exceeding this value may cause inaccurate current sensing and affect the converter's performance.
Yes, the UC3855BDW can be used in a synchronous rectification configuration. However, this requires additional components and careful design to ensure proper operation and minimize losses.
The inductor value depends on the output voltage, output current, and switching frequency. A good starting point is to use the inductor value calculation formula provided in the datasheet, and then adjust based on the specific application requirements.
Trust Checks
This model has been provided by community users.
Community Provided
This model has been verified by system checks.
System Verified
This model has been reviewed by community users.
Community Approved
Sponsored
UC3855BDW Overview
Use the download button to access the UC3855BDW schematic symbol, PCB footprint, and 3D model.
To find more CAD model downloads similar to this part, try a partial part number search, like UC385,
or try a keyword search, such as Switching Regulator or Controllers
About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
