Fully Protected H-bridge IR3220S Architecture and Typical Application - International Rectifier - #1

International iôr Rectifier

Fully Protected H-Bridge IR3220S Architecture and Typical Application

Table of Contents

Inner Architecture.................................................................................2

Shoot-Through Protection...............................................................3

Soft-Start Sequence.......................................................................4

IC Logic Control..............................................................................5

Protected High-Side Switches........................................................5

Typical Application...............................................................................6

Layout & Thermal Considerations...................................................6

Selecting the Soft-Start RC Network...............................................8

The IR 3220S is a fully protected Dual High Side Switch that features a whole H-Bridge control. With two additional Low Side MOSFETs, it limits the in-rush current of a DC motor, drives it in both directions and offers a braking mode without any external power management. Current protection ( short-circuit ) and Temperature shutdown(overload) give the IR 3220S the ability of meeting most of the Mechatronic's Customer Requirements. The High Side switches provide the direction capability and the H-Bridge protection. The Low Side MOSFETs bring the flexibility by offering the high frequency switching ability. Therefore, hard start-up of the motor is avoided and replaced by a smooth and stress-less speed ramp-up.

AN-1032

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