L6229N

Overview

The L6229N is a fully integrated DMOS driver designed for three-phase brushless DC motors, manufactured by STMicroelectronics. It utilizes BCD technology to combine isolated DMOS power transistors with CMOS and bipolar circuits on a single chip. The device operates within an 8 V to 52 V supply range and delivers a peak output current of 2.8 A (1.4 A RMS). Key electrical characteristics include a typical RDS(on) of 0.73 Ω at 25 °C and an operating frequency up to 100 kHz. It features non-dissipative overcurrent protection, thermal shutdown, and undervoltage lockout.

Feature Summary

• Integrates a three-phase DMOS bridge with constant off-time PWM current control and slow decay synchronous rectification.
• Includes decoding logic for single-ended Hall sensors supporting both 60° and 120° commutation sequences.
• Provides diagnostic outputs, tachometer signals for speed loops, and brake functions.
• Features cross-conduction protection and integrated fast free-wheeling diodes.

Applications

• Three-phase brushless DC motor drives
• Industrial automation systems
• Home appliance motor control

Procurement Notes

Verify the specific suffix 'N' against official STMicroelectronics documentation to confirm package type and tape/reel specifications. Ensure compatibility with required operating temperatures and voltage ranges. Cross-reference ordering codes with authorized distributors to avoid counterfeit components. Confirm that the selected variant meets all regulatory compliance standards for the intended application environment.

Selection Notes

Select the L6229N when a fully integrated solution for three-phase BLDC motors is required without external logic decoders. Consider its 2.8 A peak current capability and 52 V maximum voltage rating for medium-power applications. Evaluate the need for Hall sensor decoding integration versus external microcontroller-based control. Assess thermal management requirements given the integrated DMOS structure and available packages.

Part Context

The L6229 belongs to STMicroelectronics' family of DMOS motor drivers, specifically designed for three-phase applications. It differs from H-bridge drivers like the L298 or L620x series by integrating commutation logic for BLDC motors. This component simplifies design by combining power stages and control logic, reducing component count compared to discrete solutions.

FAQ

Does the L6229 support 120-degree Hall sensor decoding?

Yes, the L6229 includes dedicated decoding logic for both 60-degree and 120-degree single-ended Hall effect sensors.

What type of overcurrent protection does the L6229 provide?

It features non-dissipative overcurrent detection and protection on the high-side power MOSFETs.