A4945 Three Phase Sensorless Sinusoidal Fan Driver

Allegro

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.

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Datasheet Specifications

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

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

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

A4945 Distributors

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A4945 Three Phase Sensorless Sinusoidal Fan Driver Allegro

Allegro A4945-like datasheet