UC2843ANG4

Power Supply Controllers, Monitors Overview

The UC2843ANG4 is a current-mode PWM controller from the UCx84x series, designed for offline and DC-DC switching power supplies. It operates within an input voltage range of 10 V to 30 V and supports switching frequencies up to 500 kHz. The device features a maximum duty cycle of 100% and provides a peak output drive current of 1 A. It functions reliably across an operating temperature range of -40°C to +85°C and is housed in an 8-pin PDIP package.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture with automatic feed-forward compensation for improved transient response
• Integrated high-precision 5 V reference voltage source with ±1% accuracy
• Dedicated UVLO circuit with distinct start and stop thresholds to prevent erratic cycling during power transitions
• Built-in soft-start capability and latchable PWM logic to ensure stable operation

Power Supply Controllers, Monitors Applications

• Flyback converter designs for off-line power supplies
• Forward converter topologies requiring precise current regulation
• Boost converter applications with wide input voltage ranges
• General-purpose DC-to-DC switching regulator circuits

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'G4' indicates lead-free compliance and RoHS status as per Texas Instruments documentation. Confirm the PDIP-8 package dimensions match your PCB footprint requirements. Check for any recent PCN updates regarding manufacturing site changes or material substitutions that may affect long-term availability.

Power Supply Controllers, Monitors Selection Notes

Select this component when a 100% maximum duty cycle is required, distinguishing it from fixed-frequency variants like the UC2842. Ensure the application benefits from the adjustable oscillator frequency range up to 500 kHz. Verify that the 1 A peak output current is sufficient for driving the intended MOSFET gate capacitance at the target switching frequency.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx84x family of current-mode PWM controllers manufactured by Texas Instruments. The 'A' designation typically denotes automotive qualification standards, while 'NG4' specifies the lead-free PDIP-8 package variant. This series is widely recognized for its robust performance in industrial and consumer power management applications.

Power Supply Controllers, Monitors Replacement Considerations

Direct pin-compatible alternatives include the UC2843AN (standard commercial grade) and UC2843AD (SOIC package). For automotive-grade equivalents, consider the UC2843AQD or UC2843AQDR depending on the required package type. Always verify thermal and electrical specifications before substitution.