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A4945 - Three Phase Sensorless Sinusoidal Fan Driver

A4945 Description

A4945 and A4949 Three Phase Sensorless Sinusoidal Fan Driver .
The A4945 and A4949 three phase motor drivers incorporate sinusoidal drive to minimize audible noise and vibration for medium power fans.

A4945 Features

* 180° sinusoidal drive for low audible noise
* High efficiency control algorithm
* Sensorless operation
* Analog Speed input (A4945)
* PWM Speed input (A4949)
* Wide supply voltage range
* FG speed output
* Lock detection
* Ove

A4945 Applications

* Both packages are lead (Pb) free with 100% matte-tin leadframe plating. 8-pin SOICN 8-pin SOICN with exposed thermal pad (L package) (LJ package) Not to scale Functional Block Diagram VBB 50 kΩ Speed Demand Input PWM 100 kΩ Duty Cycle FG A4949 device shown TSD IDC Protection VREG VR

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Datasheet Details

Part number
A4945
Manufacturer
Allegro
File Size
932.32 KB
Datasheet
A4945-Allegro.pdf
Description
Three Phase Sensorless Sinusoidal Fan Driver

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Three Phase Sensorless Sinusoidal Fan Driver Allegro
Allegro A4945-like datasheet