UC2842BN

DC DC Switching Controllers Overview

The UC2842BN is a current-mode PWM controller from the UC284xB family, designed for off-line and DC-to-DC fixed-frequency applications. It features a high-current totem-pole output stage capable of sourcing or sinking peak currents suitable for driving N-channel MOSFETs. The device includes an internally trimmed oscillator for precise frequency control up to 500 kHz, with guaranteed operation at 250 kHz. It incorporates under-voltage lockout (UVLO) thresholds of 16V (on) and 10V (off), making it ideal for offline use. The controller supports duty cycles approaching 100% and offers cycle-by-cycle latching PWM for current limiting.

DC DC Switching Controllers Feature Summary

• High-current totem-pole output stage optimized for driving N-channel MOSFETs
• Internally trimmed oscillator ensuring precise frequency control up to 500 kHz
• Under-voltage lockout with hysteresis tailored for offline power supply applications
• Current-mode operation with cycle-by-cycle latching PWM for robust current limiting

DC DC Switching Controllers Applications

• Offline flyback converters
• Forward converters
• Boost converters
• DC-to-DC step-up topologies

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'BN' against the manufacturer's official datasheet to confirm package type and temperature range specifications. Ensure the component matches the required UVLO thresholds and output drive capabilities for the target design. Cross-reference ordering information with authorized distributors to guarantee authenticity and traceability.

DC DC Switching Controllers Selection Notes

Select this controller for designs requiring near-100% duty cycle capability in current-mode control schemes. It is appropriate for offline applications where the 16V/10V UVLO thresholds align with input voltage profiles. Consider the UC2844B if a maximum duty cycle limit below 50% is required instead.

DC DC Switching Controllers Part Context

The UC2842BN belongs to the UC284xB series of current-mode PWM controllers. This family provides essential features for implementing fixed-frequency control schemes with minimal external components. Key variations within the family include different UVLO thresholds and duty cycle ranges, such as the toggle flip-flop logic found in UC2844B/UC2845B models.

DC DC Switching Controllers Replacement Considerations

The UC2842AN serves as a direct functional substitute within the same family, sharing identical electrical characteristics and pinout compatibility.