The IRS21850S is a high-voltage, high-speed power MOSFET and IGBT driver from International Rectifier (now Infineon Technologies). This driver is designed to drive two N-channel MOSFETs or IGBTs in a half-bridge configuration. It is commonly used in motor control, power supplies, and other power electronics applications.

Applications

• Motor control: Driving MOSFETs/IGBTs in motor inverters.
• Power supplies: Driving MOSFETs/IGBTs in half-bridge and full-bridge power converters.
• Induction heating: Driving MOSFETs/IGBTs in induction heating systems.
• Welding equipment: Driving MOSFETs/IGBTs in welding inverters.
• Lighting ballasts: Driving MOSFETs/IGBTs in electronic ballasts.

Features

• Floating channel designed for bootstrap operation: Simplifies high-side gate drive implementation.
• Gate drive supply range from 10 V to 20 V: Offers a wide range of operating voltages.
• Logic input 3.3 V capability: Enables direct interface with 3.3 V logic circuits.
• CMOS Schmitt-triggered inputs with pull-down: Provides robust noise immunity.
• Matched propagation delay for both channels: Ensures symmetrical switching performance.

Benefits

• Simplified gate drive design: Simplifies the design of gate drive circuits.
• Improved system efficiency: Enables efficient switching of power MOSFETs and IGBTs.
• Enhanced system reliability: Provides robust gate drive for reliable operation.
• Reduced component count: Reduces component count by integrating multiple functions.
• Cost-effective solution: Offers a cost-efficient solution for gate drive applications.

Additional Details

The IRS21850S utilizes a bootstrap circuit to generate the high-side gate voltage, eliminating the need for a separate high-voltage power supply. The driver's CMOS Schmitt-triggered inputs provide robust noise immunity, preventing false triggering. The matched propagation delay ensures symmetrical switching performance, minimizing dead time and improving efficiency. Proper layout and decoupling techniques are essential for achieving optimal performance. Consult the manufacturer's datasheet for detailed specifications and application guidelines.