ir3220pcimeur02| Application Note
Integrated Power H-Bridge Controller For 80-Watt Automotive DC Motors
Xavier De Frutos, Randy Frank and Heiner Gschloessl International Rectifier as presented at PCIM Europe 02
Abstract:
A 6-amp monolithic H -bridge controller has been designed for automotive applications using a selfisolated vertical CMOS process. The controller integrates system-level interfacing circuitry and control strategy. In addition, it provides protection features including short circuit protection through overtemperature and over-current detection, as well as over-voltage protection from integrated active clamping circuitry. The H-bridge controller IC combined with few external components provides a cost-effective motor control circuit that fits within a 25 x 21 millimeter footprint. The high side switches are integrated in the controller in a standard SO-20 package for low cost, ease of drive and protection. The low side switches are in two separate SO-8 packages developed specifically for use with the controller. The controller limits the in-rush current of a DC motor and hard start-up of the motor is avoided and replaced by a smooth and a low-stress speed ramp-up. The controller drives the motor in both directi
ons and offers a braking mode without any external power management. Automotive applications for the controller include any brush type dc motor, such as seat motors, and many other body electronics applications. The self-isolated process makes the IC very cost effective. In addition, the circuit provides a flexible architecture to costeffectively address a wide variety of applications. This paper will describe the process, key elements of the circuit design and provide an application example for the motor controller.
The High Side (HS) switches provide the directional capability and the H-Bridge protection. The Low Side (LS) MOSFETs provide flexibility by offering the high frequency switching ability. Therefore, hard start-up of the motor is avoided and replaced by a smooth and lowstress speed ramp-up. Figure 1 shows the architecture for the dc motor control.
Vcc IR3220S HS 1 Free-wheeling current circulation HS 2
ON
OFF
DC Motor ( clockwise direction )
I motor
OFF
LS 1 LS 2
switching or ON
Gnd
Figure 1 - Architecture of the IR3220S H-bridge motor control. The circuitry and high side drivers in the surface mount SO-20 require only two low side MOSFETs in SO-8 packages to provide forward, reverse and braking for a dc motor. A summary of the features of this controller is:
Over-temperature protection Over-current shutdown Status feedback ESD protection H-bridge control embedded (shoot-through protection, etc. ) Internal switching oscillator (20 kHz) Inrush current limited by PWM soft-start sequence Braking / non-braking mode Sleep mode for direct battery connection
INTRODUCTION The IR3220S is a fully protected, Dual High Side Switch that features a complete H-Bridge control. With two additional Low Side MOSFETs, it limits the in-rush current of a DC motor, drives the motor in both directions and offers a braking mode without any external power management. Current protection (short-circuit) and Temperature shutdown (over-load) give the IR3220S the ability to meet most customers' mechatronics requirements.
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