UC1845J

Power Supply Controllers, Monitors Overview

The UC1845J is a current-mode PWM controller manufactured by Texas Instruments. It operates within an input voltage range of 8 V to 30 V and supports switching frequencies up to 500 kHz. The device features a maximum duty cycle of 50% and includes a precision 5 V reference output. Designed for robust performance, it functions reliably across a temperature range of -55°C to +125°C. The component is housed in an 8-pin SOIC package.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture for improved transient response
• Integrated oscillator with external timing resistor capability
• High-speed current comparator for precise pulse width modulation

Power Supply Controllers, Monitors Applications

• Off-line power supplies
• DC-to-DC converters
• Battery chargers

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'J' indicates the ceramic DIP or equivalent legacy package variant when sourcing. Confirm RoHS compliance status as older variants may differ from modern equivalents. Ensure the supplier provides official datasheets matching the Texas Instruments part number to avoid counterfeit components.

Power Supply Controllers, Monitors Selection Notes

Select this component for applications requiring wide operating temperature ranges and high reliability. The current-mode control offers better line regulation compared to voltage-mode controllers. Consider thermal management requirements due to the specified operating temperature limits and package type.

Power Supply Controllers, Monitors Part Context

This part belongs to the UC184x/UC284x/UC384x family of current-mode PWM controllers. These devices are widely used in industrial and commercial power supply designs. The UC1845J specifically denotes the military-grade or extended temperature version of the standard UC2845.

Power Supply Controllers, Monitors Replacement Considerations

Direct substitutes include UC2845J and UC3845J. Verify pin compatibility and electrical specifications before substitution. Other manufacturers offer pin-compatible alternatives, but parameter matching is essential.