UC2844BN

DC DC Switching Controllers Overview

The UC2844BN is a high-performance current mode PWM controller manufactured by onsemi, designed for off-line and DC-DC converter applications. It operates within an input voltage range of 10V to 36V and supports switching frequencies up to 500 kHz. The device features a temperature-compensated reference, a high-gain error amplifier, and a high-current totem-pole output capable of driving power MOSFETs. Key electrical parameters include a maximum duty cycle of 48%, an output current of 1A, and rise/fall times of 50 ns. It functions reliably across a temperature range of -25°C to +85°C.

DC DC Switching Controllers Feature Summary

• Integrated cycle-by-cycle current limiting and undervoltage lockout with hysteresis for enhanced protection
• High-current totem-pole output stage optimized for direct drive of power MOSFETs
• Built-in oscillator and temperature-compensated reference ensuring stable fixed-frequency operation

DC DC Switching Controllers Applications

• Off-line converters
• DC-DC step-down converters
• Flyback topology designs
• Boost topology designs

DC DC Switching Controllers Procurement Notes

Verify the package type matches the required PCB footprint, as this component is available in both through-hole and surface-mount variants. Confirm the suffix indicates the correct pin configuration and operating temperature range. Cross-reference the manufacturer part number with official datasheets to ensure compatibility with existing circuit designs and regulatory compliance standards.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring precise current-mode control with minimal external components. It is suitable for designs needing robust protection features like latch protection and single pulse metering. Consider the specific UVLO thresholds and maximum duty cycle limitations when designing for varying input voltage ranges and transformer reset requirements.

DC DC Switching Controllers Part Context

This component belongs to the UCx844B series of current mode controllers from onsemi. It shares functional similarities with other members of the family but is distinguished by its specific UVLO thresholds and package options. The series is widely recognized for providing cost-effective solutions for power management in various industrial and consumer electronic power supplies.

DC DC Switching Controllers Replacement Considerations

UC2844BD1G (SOIC-8 variant)

DC DC Switching Controllers FAQ

What are the undervoltage lockout thresholds for the UC2844BN?

The UC2844BN features undervoltage lockout thresholds of 16V for turn-on and 10V for turn-off, making it suitable for off-line converter applications.

Does the UC2844BN support peak current mode control?

Yes, the UC2844BN utilizes a high-performance current mode control architecture, featuring a current sensing comparator for cycle-by-cycle current limiting.