IR21571S

Lighting, Ballast Controllers Overview

The IR21571S is a fully integrated ballast control IC designed for driving fluorescent and high-intensity discharge (HID) lamps. It features a built-in 600 V level-shifted gate driver, supporting operating frequencies between 45.5 kHz and 50.5 kHz with a supply voltage range of 10.5 V to 16.5 V. The device provides programmable parameters including warm-up time, running frequency, and dead-time, alongside a closed-loop dimming interface. Integrated protection mechanisms include lamp filament detection, undervoltage lockout, thermal overload protection, and automatic restart capabilities.

Lighting, Ballast Controllers Feature Summary

• Fully integrated resonant half-bridge controller with embedded 600 V high-side gate driver
• Programmable warm-up duration, operating frequency, and dead-time settings
• Integrated fault detection for lamp failure, filament issues, and thermal overload
• Supports automatic restart sequences following detected fault conditions

Lighting, Ballast Controllers Applications

• Electronic ballasts for straight-tube fluorescent lighting fixtures
• High-intensity discharge (HID) lamp ballast systems
• Dual-lamp parallel or series ballast configurations
• Commercial and industrial lighting control units requiring preheat start

Lighting, Ballast Controllers Procurement Notes

Verify the specific suffix against official Infineon documentation to confirm package type and RoHS compliance status. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity. Cross-reference the ordering code with current product lifecycle notifications to confirm availability and manufacturing status before finalizing purchase orders.

Lighting, Ballast Controllers Selection Notes

Select this component for applications requiring integrated resonant control and high-voltage isolation in a single package. It is suitable for designs needing precise management of lamp ignition sequences and operational stability. Consider its fixed frequency range and integrated protection features when designing circuits for standard fluorescent and HID lamp types without external complex control logic.

Lighting, Ballast Controllers Part Context

The IR21571S belongs to the legacy International Rectifier portfolio, now maintained by Infineon Technologies following the 2014 acquisition. It represents a specialized class of integrated power management solutions for lighting applications, combining control logic with power stage driving capabilities. This integration reduces component count and simplifies the design process for electronic ballast manufacturers compared to discrete solutions.

Lighting, Ballast Controllers Replacement Considerations

Direct substitutes are not explicitly confirmed in the provided source material. Verify compatibility with existing circuit designs if considering alternative controllers, as pinouts and internal protection thresholds may differ significantly between different manufacturer families.