UC2843N

Power Supply Controllers, Monitors Overview

The UC2843N is a current-mode PWM controller from the UCx84x series, designed for offline and DC-to-DC switching power supplies. It operates within a supply voltage range of 12 V to 28 V, with a typical startup threshold of 16 V and turn-off threshold of 10 V. The device supports a maximum switching frequency of 500 kHz and delivers up to 200 mA output current. It features an adjustable oscillator, internal error amplifier, and peak current limit. The component is housed in an 8-PDIP package and functions across a temperature range of -40°C to 85°C.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture with automatic feed-forward compensation
• Hysteresis UVLO circuit for stable start-up and shut-down
• Integrated high-precision 5V reference source
• Totem-pole output stage for direct MOSFET driving

Power Supply Controllers, Monitors Applications

• Offline flyback converters
• Forward converters
• Boost DC-to-DC regulators
• Battery chargers

Power Supply Controllers, Monitors Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and package dimensions. Ensure that any alternative part numbers selected maintain identical electrical characteristics and thermal ratings. Cross-reference the RoHS status and lead-free compliance requirements with project specifications before finalizing procurement orders.

Power Supply Controllers, Monitors Selection Notes

Select this component for applications requiring robust current-mode control with inherent input voltage feed-forward. The wide operating voltage range and distinct UVLO thresholds make it suitable for designs needing reliable start-up behavior. Consider the through-hole packaging constraints when designing PCB layouts for industrial or legacy equipment integration.

Power Supply Controllers, Monitors Part Context

The UC2843N belongs to the UCx84x family of current-mode PWM controllers produced by Texas Instruments. This series provides essential functions for fixed-frequency operation with minimal external components. The N suffix denotes the standard PDIP package variant, distinguishing it from surface-mount options like the D or DR suffixes found in other family members.

Power Supply Controllers, Monitors Replacement Considerations

UC2843NG4