L6747A

Overview

The L6747A is a fully integrated three-phase brushless DC (BLDC) motor controller manufactured by STMicroelectronics. It incorporates high-voltage power stages capable of driving motors up to 30V, featuring an internal bootstrap diode and dedicated gate drivers for high-side and low-side MOSFETs. The device supports various commutation modes including six-step trapezoidal control and sensorless operation using back-EMF detection. Key functional blocks include a programmable current limiter, over-current protection, thermal shutdown, and a built-in regulator for stable internal supply voltage.

Feature Summary

• Integrated high-voltage power stage with internal bootstrap diode
• Supports sensorless and Hall-effect based commutation
• Built-in current limiting and thermal protection mechanisms

Applications

• Fan and pump motor control in home appliances
• Brushless DC motor drives in automotive systems
• Industrial equipment requiring reliable three-phase motor management

Procurement Notes

Verify the specific package variant and temperature grade against the official datasheet before ordering. Ensure that the application environment does not exceed the specified maximum junction temperature or voltage limits defined in the electrical characteristics table. Confirm compatibility with the intended motor type regarding current requirements.

Selection Notes

Select this component when a compact, single-chip solution for three-phase BLDC control is required. It is suitable for applications needing integrated power switching without external driver ICs. Consider the maximum operating voltage and current capabilities relative to the motor specifications to ensure adequate headroom for transient loads.

Part Context

This part belongs to STMicroelectronics' family of motor control integrated circuits designed for robust industrial and consumer applications. It simplifies the design of three-phase motor drives by combining logic, control, and power stages into a single package, reducing component count and board space compared to discrete solutions.

Replacement Considerations

Check for direct pin-compatible alternatives within the same manufacturer's portfolio that offer similar voltage ratings and current handling capabilities. Verify if newer generations provide enhanced features such as improved efficiency or additional protection mechanisms while maintaining mechanical compatibility.