KA3882C

AC DC Converters, Offline Switchers Overview

The KA3882C is a fixed pulse width modulation (PWM) controller designed for offline and DC-DC converter applications. It integrates an undervoltage lockout (UVLO) circuit with an 16V turn-on and 10V turn-off threshold, ensuring stable operation during startup and shutdown phases. The device features a low startup current circuit to minimize input power consumption during initial activation. Internal components include a temperature-compensated reference source and a high-gain error amplifier for precise voltage regulation. The controller supports duty cycle operation up to 100%, allowing for flexible transformer reset and flyback topology designs.

AC DC Converters, Offline Switchers Feature Summary

• Integrated undervoltage lockout with defined hysteresis thresholds
• Low startup current architecture for efficient power management
• Temperature-compensated internal reference voltage source
• High-gain error amplifier for accurate output regulation

AC DC Converters, Offline Switchers Applications

• Offline switch-mode power supplies
• Flyback converter topologies
• DC-DC step-down converters
• General-purpose AC-DC adapters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix code on the component marking to confirm package type and temperature range, as variations exist within the KA3882 family. Confirm availability status, as this part may be discontinued or subject to last-time buy restrictions depending on the manufacturing date code. Ensure the supplier provides original manufacturer documentation to validate authenticity against counterfeit risks common in legacy power management ICs.

AC DC Converters, Offline Switchers Selection Notes

Select the KA3882C when a fixed PWM controller with a higher UVLO threshold is required compared to the KA3883C variant. The 16V turn-on threshold makes it suitable for applications where the supply rail stabilizes at higher voltages before control logic activation. Consider the 8-DIP package for through-hole assembly requirements or prototyping boards where surface mount space is limited. Evaluate thermal performance if operating near maximum duty cycles.

AC DC Converters, Offline Switchers Part Context

The KA3882C belongs to the KA3882/KA3883 series of PWM controllers manufactured by onsemi. These devices are widely used in legacy power supply designs due to their robust integration and simple external component requirements. The series differentiates primarily through UVLO thresholds, with the KA3882C offering higher voltage thresholds than the KA3883C. This family serves as a foundational component for cost-effective offline power conversion systems.

AC DC Converters, Offline Switchers Replacement Considerations

LT1246CN8#PBF from Analog Devices Inc. is listed as a similar alternative.