KA3511DS

DC DC Switching Controllers Overview

The KA3511DS is a fixed-frequency intelligent voltage-mode PWM IC designed for secondary-side control in switched-mode power supplies. It integrates complete housekeeping circuitry, including a precision voltage reference trimmed to 2%, over-voltage protection for 3.3V/5V/12V outputs, and under-voltage protection. The device features dual outputs for push-pull operation with 200mA sink current capability per output. It supports variable duty cycle via dead time control, soft start functionality, double pulse suppression logic, remote on/off control, and a latch function controlled by remote and protection inputs.

DC DC Switching Controllers Feature Summary

• Integrates complete PWM control and housekeeping circuitry requiring few external components
• Provides dual outputs for push-pull operation with 200mA sink current capability
• Includes over-voltage and under-voltage protection for 3.3V, 5V, and 12V rails
• Features soft start capability and double pulse suppression logic

DC DC Switching Controllers Applications

• Secondary side control of switched-mode power supplies
• Push-pull converter topologies
• Power supply units requiring remote on/off control
• Systems needing integrated over-voltage and under-voltage protection

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'DS' against the manufacturer's official documentation to confirm pinout, package dimensions, and electrical characteristics, as suffixes often denote specific tape-and-reel packaging or temperature ranges. Confirm RoHS compliance status directly from the latest datasheet revision, as historical data indicates non-compliance for some variants while others are lead-free. Ensure the source document explicitly lists the KA3511DS part number to avoid confusion with similar models like KA3511 or KA3511BS which may have different functional specifications.

DC DC Switching Controllers Selection Notes

Select this component when designing secondary-side controllers that require integrated protection features such as over-voltage and under-voltage monitoring for multiple voltage rails. It is suitable for applications necessitating push-pull drive configurations with dedicated sink current capabilities. Consider its fixed-frequency operation and soft-start functionality for systems requiring stable startup sequences and simplified external component counts. Verify compatibility with the target power supply topology before implementation.

DC DC Switching Controllers Part Context

The KA3511DS belongs to Fairchild Semiconductor's family of intelligent voltage-mode PWM integrated circuits. It is specifically engineered for secondary-side management in switched-mode power supplies, distinguishing itself from primary-side controllers by integrating housekeeping functions directly. Related parts in the series include the KA3511 and KA3511BS, which share similar PWM control architectures but may differ in specific feature sets or packaging options.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer's obsolescence notices or cross-reference guides for direct replacements.