UC3842ANG

DC DC Switching Controllers Overview

The UC3842ANG is a discontinued high-performance current-mode PWM controller manufactured by onsemi. Designed for off-line and DC-to-DC converters, it supports Flyback, Boost, and Buck/Boost topologies with a maximum switching frequency of 500kHz. The device operates within a supply voltage range of 10V to 30V and features a duty cycle capability up to 96%. It utilizes an 8-pin PDIP package suitable for through-hole mounting and functions within an ambient temperature range of 0°C to 70°C.

DC DC Switching Controllers Feature Summary

• Implements current-mode control architecture for fixed-frequency switching applications
• Provides pulse-by-pulse current limiting and under-voltage lockout with hysteresis
• Features automatic feed-forward compensation and double pulse suppression
• Includes a high-current totem pole output stage capable of directly driving MOSFETs

DC DC Switching Controllers Applications

• Off-line AC-DC flyback power supplies
• DC-to-DC boost converter circuits
• Buck and buck-boost isolated or non-isolated power stages

DC DC Switching Controllers Procurement Notes

Verify component authenticity due to the part's obsolete status. Confirm that replacements meet original electrical specifications and pin compatibility. Check for lead-free compliance and packaging integrity. Ensure substitute sources provide valid traceability documentation. Validate thermal performance matches original design requirements before integration.

DC DC Switching Controllers Selection Notes

Select this component for designs requiring robust current-mode control in standard industrial temperature ranges. Consider alternative active parts if long-term supply continuity is critical. Evaluate external component counts for timing and compensation networks. Verify that the 8-DIP package fits the target PCB layout constraints and assembly processes.

DC DC Switching Controllers Part Context

This IC belongs to the UC3842 family of current-mode PWM controllers widely used in power management systems. The 'ANG' suffix denotes the specific manufacturer variant and package configuration from onsemi. It serves as a foundational control element for efficient energy conversion in various electronic power supply architectures.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include UC3842AM from Microchip Technology and UC3842AN from Texas Instruments. These alternatives offer functional equivalence but require verification of pinout compatibility and parameter alignment with the original design specifications.

DC DC Switching Controllers FAQ

What is the maximum operating frequency of the UC3842ANG?

The maximum switching frequency is 500kHz.

How is the oscillator frequency set?

Frequency is determined by connecting a timing resistor to the VREF pin and a timing capacitor to ground via the RT/CT pin.

Does the device support synchronous rectification?

No, the UC3842ANG does not support synchronous rectification.