UC1875L

Power Supply Controllers, Monitors Overview

The UC1875L is a high-performance current mode PWM controller designed for half-bridge and full-bridge DC-to-DC converter applications. It integrates a precision oscillator, error amplifier, and output stage capable of driving high-side and low-side MOSFETs or IGBTs with up to 2A peak sink/source current. The device features adjustable dead-time control, under-voltage lockout, and cycle-by-cycle current limiting to ensure reliable operation in isolated power supply topologies.

Power Supply Controllers, Monitors Feature Summary

• Integrated high-current push-pull output driver for direct gate drive
• Adjustable dead-time control to prevent cross-conduction
• Precision current-mode architecture with cycle-by-cycle limiting

Power Supply Controllers, Monitors Applications

• Isolated flyback converters
• Half-bridge resonant converters
• Full-bridge DC-to-DC converters

Power Supply Controllers, Monitors Procurement Notes

Verify the suffix 'L' indicates the military temperature range variant (-55°C to 125°C) compared to the commercial 'N' variant. Confirm package type matches design requirements, typically SOIC-16 or DIP-16. Ensure sourcing from authorized distributors to guarantee authenticity and traceability for aerospace or defense specifications.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing isolated power supplies requiring precise timing control and robust gate driving capabilities. The current-mode control simplifies compensation and provides inherent line feed-forward. Consider thermal management requirements for the selected package and verify input voltage ranges align with the specific application's bus voltage.

Power Supply Controllers, Monitors Part Context

Part of Texas Instruments' legacy UC187x series of PWM controllers. The UC1875 specifically targets bridge configurations, distinguishing itself from single-ended counterparts like the UC1842. It serves as a critical control element in high-efficiency industrial and military power conversion systems requiring strict duty cycle regulation.

Power Supply Controllers, Monitors Replacement Considerations

UC1875N (commercial grade equivalent), UC2875L (military grade equivalent). Verify pin compatibility and electrical parameter tolerances before substitution.