UC3845BDR2

DC DC Switching Controllers Overview

The UC3845BDR2 is a high-performance current mode PWM controller manufactured by onsemi, designed for isolated and non-isolated DC-DC converter applications. It operates within a supply voltage range of 10V to 36V and supports switching frequencies up to 500 kHz. The device features a fixed maximum duty cycle of 48% and includes an integrated oscillator with programmable timing. Key electrical parameters include a 1A peak output drive current, a shutdown pin for power management, and low startup current consumption. It is housed in a 14-SOIC package.

DC DC Switching Controllers Feature Summary

• Current mode control architecture for rapid line transient response
• Integrated oscillator with frequency synchronization capability
• Built-in hysteresis comparator for precise overvoltage protection
• Dedicated shutdown pin for system power management

DC DC Switching Controllers Applications

• Flyback converters with isolated outputs
• Boost regulators for battery charging
• Forward converters requiring high efficiency
• Universal AC-DC power supplies

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'R2' indicates tape and reel packaging when sourcing components. Confirm that the 14-SOIC footprint matches the target PCB design. Ensure the operating temperature range aligns with the intended industrial or commercial environment requirements before finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this component for designs requiring robust current-mode control and high-frequency operation. It is suitable for applications needing precise overvoltage protection via the built-in comparator. Consider the 14-pin package size constraints and thermal dissipation capabilities relative to the expected load conditions during the selection process.

DC DC Switching Controllers Part Context

This part belongs to the UCx84x family of current-mode controllers, widely used in switch-mode power supplies. It shares functional similarities with other members like the UC3844 series but offers specific enhancements in protection features and operating frequency ranges. The UC3845 variant is optimized for applications demanding reliable performance under varying load conditions.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include the UC3845BD1R2G and UC3845BNG, which offer similar electrical characteristics but may differ in package type or manufacturing lot specifications. Verify pin compatibility and parameter tolerances before implementing any cross-replacement in existing designs.