UC3843BD1R2

DC DC Switching Controllers Overview

The UC3843BD1R2 is a high-performance fixed-frequency current mode PWM controller manufactured by onsemi. Designed for offline and DC-DC converter applications, it supports Boost, Flyback, and Forward topologies. The device features a precision oscillator with temperature compensation, ensuring stable operation up to 500 kHz switching frequencies. It integrates a high-current totem-pole output capable of driving power MOSFETs directly, along with built-in protection mechanisms including undervoltage lockout (UVLO) with hysteresis and latch-based cycle-by-cycle current limiting. The component operates within a supply voltage range of 7.6 V to 30 V and is available in an SOIC-8 surface-mount package.

DC DC Switching Controllers Feature Summary

• Precision internal oscillator with temperature compensation for accurate frequency control
• High-current totem-pole output stage designed for direct MOSFET drive
• Integrated cycle-by-cycle current limiting with latch protection
• Undervoltage lockout with hysteresis for reliable startup and shutdown

DC DC Switching Controllers Applications

• Offline power supply converters
• DC-DC step-up (Boost) converters
• Flyback transformer-based power supplies
• Forward converter designs

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'D1R2' against official datasheets to confirm packaging type and tape-and-reel specifications. Ensure compatibility with required operating temperature ranges and pinout configurations before integration. Cross-reference manufacturer part numbers to avoid confusion with similar variants in the UC384x family.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring precise current-mode control with minimal external components. It is suitable for designs needing robust protection features like cycle-by-cycle limiting and UVLO. Consider the maximum switching frequency and duty cycle limits when designing the timing network and feedback loop for optimal performance.

DC DC Switching Controllers Part Context

This component belongs to the UC384x series of current-mode PWM controllers from onsemi. These devices are widely used in power management systems due to their integrated features and cost-effectiveness. The UC3843 variant specifically targets low-voltage applications with its distinct UVLO thresholds compared to other models in the series.

DC DC Switching Controllers Replacement Considerations

Compatible substitutes include UC3843BVD1R2G and UC3843BNG. Verify pin compatibility and electrical parameters such as UVLO thresholds and output drive capability before substitution.