A5931GESTR-1-T

Overview

The A5931GESTR-1-T is a three-phase sensorless fan driver IC from Allegro MicroSystems, designed for brushless DC (BLDC) motor applications. It features a sinusoidal drive to minimize audible noise and vibration. The device integrates a flexible closed-loop speed control system with Dell speed curve support and forced open loop curve updates. It operates within a supply voltage range of 5 V to 16 V and delivers an output current of 3 A. The component functions at a working frequency of 400 kHz with a quiescent current of 8.5 mA. It is housed in a QFN-24 package and supports operation temperatures from -40 °C to +105 °C.

Feature Summary

• Integrates a sinusoidal drive mechanism to reduce audible noise and mechanical vibration in high-speed server fans.
• Includes a flexible closed-loop speed control system with specific support for Dell speed curves and forced open loop updates.
• Provides full integration of control logic and power stages for three-phase sensorless BLDC fan drivers.

Applications

• High-speed server fan cooling systems
• Three-phase sensorless BLDC fan driver implementations
• Applications requiring minimized audible noise and vibration

Procurement Notes

Verify the specific suffix '1-T' against official Allegro documentation to confirm inclusion of Dell speed curve and forced open loop update features, as these are distinct from the standard A5931GESTR-T variant. Ensure compatibility with the required QFN-24 packaging and humidity sensitivity handling procedures during assembly. Confirm that the 5 V to 16 V operating range aligns with the target system power design.

Selection Notes

Select this component when specific closed-loop control algorithms, such as Dell speed curves, are required for fan management. It is suitable for designs needing integrated sinusoidal drive capabilities to meet strict acoustic performance standards. Consider the 3 A output capability and 400 kHz switching frequency for appropriate thermal and electromagnetic interference management in the final PCB layout.

Part Context

This part belongs to the A5931 series of three-phase sensorless fan drivers. It shares the core hardware architecture with variants like A5931GESTR-T but differs in firmware or configuration settings related to speed control profiles. The series is categorized under Motor / Motion / Ignition Controllers & Drivers within Allegro's portfolio.

Replacement Considerations

The A5931GESTR-T is a related variant within the same family. However, it lacks the specific Dell speed curve and forced open loop update features documented for the A5931GESTR-1-T. Direct substitution requires verification that the alternative control profile meets the application's acoustic and operational requirements.

FAQ

What distinguishes the A5931GESTR-1-T from the standard A5931GESTR-T?

The A5931GESTR-1-T includes specific support for Dell speed curves and forced open loop curve updates, which are not documented for the standard A5931GESTR-T variant.

How does the A5931GESTR-1-T manage noise and vibration?

It utilizes an integrated sinusoidal drive technology designed to minimize audible noise and mechanical vibration compared to traditional trapezoidal drive methods.