FEELING
TECHNOLOGY
Features
Motor driver with high sensitivity Hall-effect sensor
H-Bridge MOS driver
Lock-shutdown protection & auto-restart function
Built-in tachometer signal output (FG)
“Soft-switch” phase-switching technique to reduce vibration and acoustic noise
Thermal shutdown protection (TSD)
PWM mode variable speed control
Available in TS826 package
For 5V DC motor / FAN systems
FD0257f
Smart motor driver with embedded Hall sensor
Halogen Free
General Description
FD0257f is a single-phase full-wave motor driver with embedded Hall-effect sensor. It integrates a H-bridge MOS
driver, a high sensitivity Hall-effect sensor, an event timer for locked rotor detection, and the variable speed control
function with the tachometer signal output logic into the ultra-small TS826 package, which make the motors’ PCB
(printed circuit board) design easier and the fabrication of small-size DC motors or FANs as simple as possible.
The external system could read the motor’s speed of rotation from FG signal of FD0257f.For safety, Lock-shutdown
function turns the IC’s internal driver off to avoid over-heating when the rotor is locked, and the IC will try to re-start
the motor after the shutdown interval.
Thermal-shutdown protection (TSD) ensures the internal driver of IC is operating under the safe operating
temperature range.
All the protection mechanisms mentioned above combine to provide a complete protecting scenario in the motor
system and avoid any possible damages and guarantee under a correct and safe operation.
Block Diagram
Bias Generator
Hall Plate
Chopper Amplifier
PWM Control
Oscillator
Digital Control Logic
(Event Timer)
H-Bridge
MOS Driver
Power On
Reset
Figure.1
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.
Rev1.2 Sep. 03, 2009
P.1
FEELING
TECHNOLOGY
Pin Connection
FD0257f
FD0257f
PWM
VDD
SO
6
5
4
bc
1
2
3
g
Figure.2
Name
FG
VSS
NO
SO
PWM
VDD
I/O
O
G
O
O
I
P
FD0257f
1
2
3
4
5
6
Description
Tachometer Signal Output
Ground
Driver Output 1
Driver Output 2
Pulse Width Modulation Speed Control Input
Positive Power Supply
Pin Descriptions
Legend: I=input, O=output, I/O=input/output, P=power supply, G=ground
Functional Descriptions
Refer to the block diagram (Figure.1), FD0257f 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 logic.
Power On Reset
Used to detect the power-up ramp and reset the digital circuits.
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 Logic
Hall sensor part – generates magnetic pole signals from the Hall-effect sensor.
Driver part – generates switching signals to the H-Bridge MOS driver.
Timer part – generates an interval of time when rotor locked event is occurred.
Signal part – generates a tachometer (FG) output.
VSS
NO
FG
Rev1.2 Sep. 03, 2009
P.2
FEELING
TECHNOLOGY
FD0257f
PWM control
PWM(pulse-width modulation) is used for the speed control for FD0257f. PWM input signal can be used directly
to the PWM pin of FD0257f and it will pass this pulse to the coil drivers with the original duty-cycle ratio.
r.p.m.
Full Speed
(H
Ratio = H / (H + L)
2.5V
0.7V
f
Duty Cycle
0%
100%
100%
V
PWM
Figure.3
Note:
(1) This function is available for FD0257f.
(2) The lower-limit for the PWM pulse frequency is 200Hz, and the recommended frequency range is in the
range of 25~30kHz where the PWM input pulses will not generate acoustic noise.
Note.
The “PWM” pin contains an internal pull-up resistor so the FD0257f will rotate at full-speed(100% ON)
when this pin is left un-connected(floating).
Rev1.2 Sep. 03, 2009
P.3
FEELING
TECHNOLOGY
Absolute Maximum Ratings
Parameter
Operating Temperature
Storage Temperature
DC Supply Voltage(V
DD ,
FG)
PWM Voltage Range
Supply Current
Continuous Current
Hold current
FG sink current
Junction Temperature
Maximum Power Dissipation
Thermal resistance (note1)
Thermal resistance (note1)
Magnetic Flux Density
IR-Reflow Lead Temperature
Symbol Conditions
T
OP
T
ST
V
DD
PWM
HIGH
PWM
LOW
I
DD
I
CONT
I
HOLD
I
SINK
T
J
P
DTS826
θja
θjc
B
T
P
10sec
2,
FD0257f
Values
typ.
Unit
min.
-20
-40
max.
105
150
6.5
6.5
-
-
-
-
-
-
-
-
-
-
TS826
TS826
0
3
500
800
25
170
520
0.278
0.018
Unlimited
260
mA
mA
mA
mA
mW
/mW
/mW
Gauss
Note1:
device mounted with copper area of approximately 10mm 1ØZ, no air flow. (room temperature: 25
255 ± 5
o
C
10 ± 1 sec
ROOM TEMP
150 ± 10
o
C
90 ± 30 sec
2~5
o
C /sec
2~5
o
C /sec
SECOND
IR-ReFlow Soldering Condition
Figure.4
TS826 Power Dissipation Curve
Pd (mW)
520
430
340
250
160
70
0
105
o
C
170
0
25
50
75
100
125
150
o
C
175
Temp. ( C )
o
Figure.5
Rev1.2 Sep. 03, 2009
P.4
℃
℃
℃
V
V
V
-
℃
℃
℃
℃
)
FEELING
TECHNOLOGY
Recommended Operating Conditions
Parameter
Supply Voltage (V
DD
)
Ambient Temperature (T
a
)
Conditions
-
-
min.
1.8
-20
Values
typ.
max.
5.5
105
FD0257f
Unit
V
Parameter
Average Supply Current(no load)
Output Saturation Voltage(FG)
Output Leakage Current(FG)
On resistance(Rpmos+Rnmos)
Thermal Shutdown Threshold
PWM High Level
PWM Low Level
Locked Rotor Period(T
ON
)
Locked Rotor Period(T
OFF
)
Conditions
I
out
= 5mA
V
out
=5V
0.8
2.5
0
0.4
2.8
V
DD
0.7
Magnetic Characteristics
Parameter
Operate Points( B
OP
)
Release Points( B
RP
)
Hysteresis( B
HYS
)
Conditions
min.
Values
typ.
15
-15
30
max.
Unit
G
G
G
Hysteresis Characteristics
V
V
N
Markink side
S
B
Brp
Bop
Brp
Bop
NO
SO
Figure.6
Rev1.2 Sep. 03, 2009
P.5
s
s
V
V
℃
℃
℃
℃
℃
Electrical Characteristics V
DD
=5.0V, T
a
=25
(unless otherwise specified)
Values
typ.
3
0.4
1
max.
Unit
mA
V
µA
min.
150
℃
B
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