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Feeling Technology |
FEELING
TECHNOLOGY
FD0251b
FD0255b
Smart motor driver with embedded Hall sensor
FEATURES
Motor driver with integrated Hall sensor
High current driving capability
Lock-shutdown protection & auto-restart function
Halogen
Free
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
Bias Generator
Hall Plate
Chopper amplifier PWM control
Oscillator
Power-On
Reset
Digital control logics
Figure.1
Coil Driver
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
PIN CONNECTION
FD0251b
FD0255b
5
bb
12
4
g
3
65
ba
12
4
g
3
FD0251b
Figure.2
FD0255b
PIN DESCRIPTIONS
Name
I/O FD0251b
FD0255b
Description
FG O 1
1
Frequency generation
VSS
G
2
2
Ground
NO O 3
3
Driver output
SO O 4
4
Driver output
VDD
P
5
5
Positive power supply
PWM
I
-
6
Pulse Width Modulation speed control
Legend: I=input, O=output, I/O=input/output, P=power supply, G=ground
FUNCTIONAL DESCRIPTIONS
Refer to the block diagram (Figure.1), FD0251b/FD0255b is composed of the following building blocks:
Bias generator
The bias generator provides precise, temperature- and process-insensitive bias references for the analog blocks.
These references guarantee proper operation of the IC under all conditions specified in this specification.
Oscillator
The built-in oscillator provides the clock signal for the digital control logics
Power-on Reset
Used to detect the power-up ramp and reset the digital circuits to achieve correct operation as soon as the power is
ready.
Chopper Amplifier
To achieve a higher magnetic sensitivity the chopper amplifier structure is adopted in this design. Use of this
structure dynamically removes both the offset and flicker noise at the same time.
Digital control logics
Hall sensor part – generates controlling signals for the Hall sensor.
Coil driver part – generates controlling signals for the Coil driver.
Tachometer (FG) signal output
Rev1.9 Dec. 18, 2008
P.2
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