The IR21084 is a high voltage, high speed power MOSFET and IGBT driver with dependent high and low side referenced output channels. Manufactured by International Rectifier (now Infineon Technologies), this driver is designed for applications such as motor drives, power supplies, and lighting ballasts. It features a floating channel designed for bootstrap operation, allowing it to drive N-channel MOSFETs or IGBTs in half-bridge or full-bridge configurations.

Applications

• Motor drives (e.g., BLDC, PMSM)
• Power supplies (e.g., SMPS, UPS)
• Lighting ballasts
• Induction heating
• Welding equipment

Features

• Floating channel designed for bootstrap operation up to +600V
• Gate drive supply range from 10V to 20V
• Undervoltage lockout (UVLO) for both high and low side drivers
• Cross-conduction prevention logic
• Matched propagation delay for both channels
• CMOS Schmitt-triggered inputs with pull-down

Benefits

• Efficiently drives high-side and low-side power MOSFETs/IGBTs
• Simplified bootstrap circuit for high-side gate drive
• Protects power devices from undervoltage conditions
• Prevents shoot-through in bridge configurations
• Precise timing control for optimal performance
• Robust and reliable operation

Additional Details

The IR21084 operates with a gate drive supply voltage ranging from 10V to 20V, providing ample gate drive voltage for most power MOSFETs and IGBTs. The floating channel allows the high-side driver to operate at voltages up to +600V, making it suitable for high-voltage applications. The undervoltage lockout (UVLO) feature protects the power devices from damage caused by insufficient gate drive voltage.

The cross-conduction prevention logic prevents shoot-through in bridge configurations, ensuring reliable operation and preventing damage to the power devices. The matched propagation delay for both channels ensures precise timing control, which is crucial for optimal performance in applications such as motor drives. The CMOS Schmitt-triggered inputs with pull-down provide robust and reliable operation, even in noisy environments. The IR21084 is a versatile and reliable gate driver that simplifies the design of high-voltage power conversion systems.