E-UC2842BD1

DC DC Switching Controllers Overview

The UC2842BD1 is a current mode PWM controller from STMicroelectronics designed for off-line and DC-DC converters. It operates within a supply voltage range of 10V to 30V and supports switching frequencies up to 500kHz, with an oscillator frequency guaranteed at 250kHz. The device features under-voltage lockout thresholds of 16V (on) and 10V (off), making it suitable for offline applications. It allows duty cycles approaching 100% and includes cycle-by-cycle current limiting. The component is housed in an 8-SOIC package.

DC DC Switching Controllers Feature Summary

• Implements fixed-frequency current mode control schemes with minimal external components
• Features a high-current totem pole output stage capable of sourcing or sinking peak currents for N-channel MOSFETs
• Includes internally trimmed oscillator and precision reference for accurate frequency and duty cycle control
• Provides automatic feed-forward compensation and latching PWM for robust cycle-by-cycle protection

DC DC Switching Controllers Applications

• Off-line AC-DC power supplies
• Isolated flyback converter topologies
• Boost converter designs
• Forward converter implementations

DC DC Switching Controllers Procurement Notes

Verify the specific manufacturer origin, as the UC2842BD1 designation is also utilized by onsemi. Confirm that the delivered component matches the intended STMicroelectronics specification regarding pinout and electrical characteristics. Ensure compatibility with the required operating temperature range and packaging format before finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring high efficiency and precise current mode regulation. It is ideal for designs needing duty cycles near 100%, distinguishing it from variants limited to less than 50%. Consider the 16V UVLO threshold when designing startup circuits for offline power stages compared to lower threshold family members.

DC DC Switching Controllers Part Context

This component belongs to the UC284xB family of current mode PWM controllers. It shares core architectural features with siblings like the UC2843B, UC2844B, and UC2845B. Key differentiators within the family include specific under-voltage lockout thresholds and maximum duty cycle capabilities, with the UC2842B optimized for high-duty-cycle offline applications.

DC DC Switching Controllers Replacement Considerations

The UC2842BN serves as a direct pin-compatible replacement in DIP-8 packaging. For tape-and-reel requirements, the UC2842BD1R2G from onsemi offers equivalent functionality. Verify that substitute sources maintain identical UVLO thresholds and duty cycle specifications.