UC1842W

Power Supply Controllers, Monitors Overview

The UC1842W is a current-mode PWM controller manufactured by Texas Instruments, designed for offline and DC-to-DC converter applications. It features a high-current totem-pole output capable of driving external power MOSFETs directly. The device integrates an internally trimmed bandgap reference, an error amplifier, and a precision oscillator with clocked discharge. Key protection mechanisms include pulse-by-pulse current limiting, undervoltage lockout with hysteresis, and double-pulse suppression. It operates within a supply voltage range of 6.95V to 30V and supports switching frequencies up to 500 kHz.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture with integrated precision oscillator
• High-current totem-pole output stage for direct MOSFET drive
• Built-in pulse-by-pulse current limiting and undervoltage lockout
• Internally trimmed bandgap reference and error amplifier

Power Supply Controllers, Monitors Applications

• Offline flyback converters
• Forward converters
• Half-bridge and full-bridge topologies
• Push-pull DC-to-DC converters

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm temperature grade and package type. Ensure compatibility with system requirements regarding operating temperature range and pin configuration. Cross-reference datasheet revisions to validate electrical characteristics and mechanical dimensions before finalizing procurement specifications.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring robust current-mode control in isolated power supplies. Evaluate thermal management needs based on the SOIC-16 package constraints. Confirm that the input voltage range aligns with the application's supply rails. Consider the internal oscillator accuracy and external timing resistor/capacitor selection for precise frequency setting.

Power Supply Controllers, Monitors Part Context

The UC1842W belongs to the UC184x/UC284x/UC384x family of current-mode PWM controllers from Texas Instruments. This series provides a scalable solution for various power conversion topologies, differing primarily in temperature grades and initial qualification standards. The UC184x variant typically denotes commercial temperature range operation.

Power Supply Controllers, Monitors Replacement Considerations

• UC2842DW
• UC3842DW

Power Supply Controllers, Monitors FAQ

What is the maximum switching frequency supported by the UC1842W?

The UC1842W supports switching frequencies up to 500 kHz, determined by external timing components.

Does the UC1842W include built-in protection features?

Yes, it includes pulse-by-pulse current limiting, undervoltage lockout with hysteresis, and double-pulse suppression.