UC3843BVD1R2

DC DC Switching Controllers Overview

The UC3843BVD1R2G is a high-performance fixed-frequency current mode PWM controller designed for offline and DC-DC converter applications. It features a trimmer oscillator for precise frequency control, temperature-compensated reference, and high-gain error amplifier. The device supports switching frequencies up to 500 kHz with a maximum duty cycle of 96%. It includes automatic feedforward compensation, latch-based PWM for cycle-by-cycle current limiting, and a high-current图腾柱 output for driving power MOSFETs. Operating voltage ranges from 7.6V to 30V, with an operating temperature range of -40°C to +105°C in an SOIC-8 package.

DC DC Switching Controllers Feature Summary

• High-current图腾柱 output stage suitable for driving power MOSFETs
• Cycle-by-cycle current limiting with latch-based PWM protection
• Temperature-compensated internal reference with under-voltage lockout

DC DC Switching Controllers Applications

• Offline power converters
• DC-DC converters
• Battery chargers

DC DC Switching Controllers Procurement Notes

Verify the complete part number suffix, as 'UC3843BVD1R2' appears truncated compared to standard listings like 'UC3843BVD1R2G'. Confirm the specific tape-and-reel quantity and packaging variant required for your assembly line. Ensure the manufacturer is onsemi and the RoHS status matches project requirements before finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this component when designing flyback or boost topologies requiring precise current-mode control. The UC3843B series offers lower UVLO thresholds (8.5V/7.6V) compared to the UC3842 series, making it suitable for low-voltage applications. Ensure external timing components are selected to maintain oscillation within the guaranteed 250 kHz specification for optimal performance.

DC DC Switching Controllers Part Context

This device belongs to the UC384x family of current-mode PWM controllers from onsemi. It shares architectural similarities with the UC3842B but differs in under-voltage lockout thresholds, positioning it for different input voltage ranges. The 'B' suffix typically denotes improved specifications over earlier revisions, such as tighter frequency tolerance and enhanced thermal stability.

DC DC Switching Controllers Replacement Considerations

Direct pin-compatible substitutes include the UC3843BVNG (PDIP-8) and UC3843BVDG (SOIC-8). Verify that replacement parts match the specific UVLO thresholds and package dimensions required by the existing PCB layout.