IR21531PBF

Gate Driver Overview

The IR21531PBF is a self-oscillating half-bridge gate driver IC designed for high-voltage power applications. It integrates a 600V floating channel and bootstrap support circuitry within an 8-pin PDIP package. The device operates with an input voltage range of 10V to 15.6V, providing peak output currents of 0.26A sink and 0.18A source. Key electrical parameters include a VBS UVLO threshold of 10V (On) / 8V (Off), a VCC UVLO threshold of 9V (On) / 8V (Off), and a fixed deadtime of 0.6µs. The component supports functional level-shift isolation and is rated for industrial quality standards.

Gate Driver Feature Summary

• Self-oscillating architecture eliminates the need for external PWM control signals
• Integrated high-voltage half-bridge driver with bootstrap support
• Fixed 0.6µs deadtime prevents cross-conduction in bridge configurations
• Shutdown functionality accessible via the CT pin

Gate Driver Applications

• High-frequency lighting ballasts
• Resonant converter topologies
• Induction heating systems
• Power factor correction circuits

Gate Driver Procurement Notes

Verify current availability status as the IR21531 series is marked as discontinued or scheduled for obsolescence by Infineon Technologies. Confirm that the specific PBF suffix corresponds to the lead-free PDIP-8 package variant required for your assembly process. Cross-reference the datasheet revision date to ensure compatibility with existing design specifications before finalizing procurement plans.

Gate Driver Selection Notes

Select this component when a self-oscillating drive method is preferred over external PWM control to simplify the control loop. Ensure the application requires a 600V blocking capability and can accommodate the fixed 0.6µs deadtime. Verify that the operating frequency falls within the internal oscillator's valid range and that the load capacitance is compatible with the specified source and sink current capabilities.

Gate Driver Part Context

The IR21531 serves as an improved successor to the IR2151 and IR2155 gate drivers, offering enhanced functionality and ease of use. It belongs to Infineon's family of high-voltage integrated circuits designed for robust performance in demanding power electronic environments. The PBF designation indicates a lead-free compliant packaging option suitable for modern manufacturing standards.

Gate Driver Replacement Considerations

Public confirmed substitute part numbers are not provided in the available documentation. Due to the discontinued status, direct replacements may require evaluating newer generations from the manufacturer or alternative suppliers with similar self-oscillating half-bridge characteristics.