FD0251b

FD0255b

Smart motor driver with embedded Hall sensor

This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Rev1.9 Dec. 18, 2008

P.1

FEELING

TECHNOLOGY

FEATURES

Motor driver with integrated Hall sensor

High current driving capability

Lock-shutdown protection & auto-restart function

Built-in FG(frequency generation) signal output “Soft-switch” phase-switching technique to reduce vibration

and acoustic noise

Thermal shutdown protection

PWM speed control(only available for FD0255b)

Available in both T825(FD0251b) and T826(FD0255b) packages

GENERAL DESCRIPTION

FD0251b/FD0255b is a single coil motor driver with embedded Hall sensor. It integrates the motor driver with the

Hall sensor, which simplifies the PCB(printed circuit board) design and make the fabrication of small-size motors

possible.

Lock-shutdown and auto-restart function keeps the motor from being over-heated and restarts the motor after being

locked.

FD0251b and FD0255b are built-in the signal output of rotation speed function, the system could detect the rotation

speed of motor when using FD0251b and FD0255b.

“Soft-switch” phase-switching technique is used to reduce the vibration and acoustic noise.

Thermal-shutdown protection ensures the motor driver to operate under specified temperature ranges.

All the protection mechanisms mentioned above combine to provide a complete protecting scenario for the motor

system, keep the motor system from possible damages and guarantee correct operations.

BLOCK DIAGRAM

Figure.1

Halogen

Free

Bias Generator

Coil Driver

Oscillator

Hall Plate

Reset

Power-On

Digital control logics

Chopper amplifier

PWM control