UC3845BVD

DC DC Switching Controllers Overview

The UC3845BVD is a high-performance fixed-frequency current mode controller from the UC3845B series, designed for offline and DC-DC converter applications. It operates with a guaranteed oscillator frequency of 250 kHz and supports switching frequencies up to 500 kHz. The device features an internally trimmed reference with undervoltage lockout, a high-gain error amplifier, and a high-current totem pole output suitable for driving power MOSFETs. It offers automatic feed-forward compensation and latching PWM for cycle-by-cycle current limiting. The component is housed in an SOIC-8 package.

DC DC Switching Controllers Feature Summary

• High-performance fixed-frequency current mode control architecture
• Integrated high-current totem pole output for direct MOSFET drive
• Automatic feed-forward compensation for improved line regulation
• Latching PWM protection with cycle-by-cycle current limiting

DC DC Switching Controllers Applications

• Offline flyback converters
• Forward converters
• DC-DC step-up (Boost) converters
• DC-DC step-down (Buck) converters

DC DC Switching Controllers Procurement Notes

Verify the specific suffix against the manufacturer's datasheet to confirm pinout compatibility and electrical tolerances. Ensure the ordering code matches the required package style and tape-and-reel specifications. Cross-reference the RoHS status and environmental compliance data provided in the official documentation before finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this controller for designs requiring precise frequency control and robust current-mode regulation. It is suitable for applications needing minimal external components while maintaining high efficiency. Consider the operating temperature range and voltage limits relative to the target power supply topology. Evaluate the need for its specific protection features against alternative standard controllers.

DC DC Switching Controllers Part Context

This component belongs to the UC3845B series of high-performance current mode controllers manufactured by onsemi. The series is engineered to provide cost-effective solutions for power conversion systems with reduced external component counts. It shares architectural similarities with other members of the UC384x family but is optimized for specific frequency and performance characteristics.

DC DC Switching Controllers Replacement Considerations

UC3845BD1R2G

DC DC Switching Controllers FAQ

What is the maximum switching frequency supported by the UC3845BVD?

The oscillator frequency is guaranteed at 250 kHz, but the device supports current mode operation up to 500 kHz.

Does the UC3845BVD include overcurrent protection?

Yes, it features latching PWM for cycle-by-cycle current limiting via the internal current sensing comparator.