FEELING
TECHNOLOGY
Features
Motor driver with high sensitivity Hall-effect sensor
H-Bridge MOS driver
Lock-shutdown protection & auto-restart function
“Soft-switch” phase-switching technique to reduce vibration and acoustic noise
Thermal shutdown protection(TSD)
Available in SIP-4L package
For 5V and 12V DC motor / FAN systems
FD1257AH
Smart motor driver with embedded Hall sensor
Halogen Free
General Description
FD1257AH is a single-phase full wave motor driver with embedded Hall-effect sensor IC. It integrates a H-bridge
MOS driver, a high sensitivity hall-effect sensor, an event timer for rotor locked in SIP-4L package, which make the
motors’ PCBs(printed circuit boards) design easy and fabricate the high efficiency DC motors or FANs as simply as
possible.
For safety, Lock-shutdown function would turn the IC’s internal drivers off avoiding over-heat when the rotor is
locked, and IC will try to re-start the rotor’s torque after the time of these drivers’ shutdown.
Thermal-shutdown protection (TSD) ensures the internal drivers of IC are operating under a 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
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 Aug. 25, 2009
P.1
FEELING
TECHNOLOGY
Pin Connection
Marking Distinguish
FD1257AH
1257A
YMV-XX
1
2
3
4
1257A
YMV-XX
Lot Number
Mass Production Version
Half month (ex:A,B ~ X)
Year (ex: 2008
8)
VDD
Figure.2
VSS
NO
SO
Figure.3
Pin Descriptions
Name
VDD
NO
SO
VSS
I/O
P
O
O
G
FD1257AH
1
2
3
4
Description
Positive Power Supply
Driver Output 1
Driver Output 2
Ground
Legend: I=input, O=output, I/O=input/output, P=power supply, G=ground
Functional Descriptions
Refer to the block diagram (Figure.1), FD1257AH 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 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 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.
Rev1.2 Aug. 25, 2009
P.2
FEELING
TECHNOLOGY
Absolute Maximum Ratings
Parameter
Operating Temperature
Storage Temperature
DC Supply Voltage
Output Voltage (NO, SO)
Supply Current
Continuous Current
Hold Current
Peak Current
Junction temperature
Power Dissipation
Thermal Resistance
Thermal Resistance
Magnetic Flux Density
IR-Reflow Lead Temperature
Symbol
T
OP
T
ST
V
DD
V
OUT
I
DD
I
O(CONT)
I
O(HOLD)
I
O(PEAK)
T
J
θ
JC
θ
JA
B
T
P
10sec
P
D
SIP-4L
SIP-4L
SIP-4L
55
92.6
Conditions
-
-
V
SS
< V
DD
V
DD
= 2.5V ~ 15V
-
T
a
=25℃
T
a
=25℃
<100µs, T
a
=25℃
min.
-40
-55
Values
Typ.
max.
85
150
18
FD1257AH
Unit
℃
℃
V
V
mA
mA
mA
mA
℃
mW
V
DD
+ 0.3V
6
450
1000
1200
180
1350
℃/W
℃/W
Gauss
℃
Unlimited
260
Power Dissipation Curve
Pd (mW)
1350
1101
842
594
324
108
0
85
℃
o
o
0
25
50
75
100
125
150(T
SHUT
)
Temp. ( C )
o
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
Rev1.2 Aug. 25, 2009
P.3
FEELING
TECHNOLOGY
Recommended Operating Conditions
Parameter
Supply Voltage
Operating Temperature Range
FD1257AH
Values
typ.
Unit
℃
V
Symbol
V
DD
T
a
Conditions
-
-
min.
2.5
-40
max.
17
85
Electrical Characteristics T
a
=25℃
(unless otherwise specified)
℃
Parameter
Average Supply Current(no load)
On resistance (R
PMOS
+R
NMOS
)
Thermal Shutdown Threshold
Locked Rotor Period
Locked Rotor Period
Symbol
I
DD
R
DS(ON)
T
SHUT
T
ON
T
OFF
Conditions
V
DD
= 17V
V
DD
= 2.5V
V
DD
= 17V
min.
4.5
150
Values
typ.
3.5
5.0
2.5
0.4
4.1
max.
5.5
Unit
mA
℃
s
s
Magnetic Characteristics
Parameter
Operate Points
Release Points
Hysteresis
Symbol
B
OP
B
RP
B
HYS
Conditions
min.
5
-5
10
Values
typ.
25
-25
50
max.
50
-50
100
Unit
G
G
G
Driver output vs. Magnetic Pole
Parameter
North pole
South pole
Test Conditions
B < Brp
B > Bop
NO
High
Low
SO
Low
High
Note:
The magnetic pole is applied facing the branded side of the package
Hysteresis Characteristics
V
V
B
Brp
Bop
Brp
Bop
B
NO
SO
Rev1.2 Aug. 25, 2009
P.4
FEELING
TECHNOLOGY
Performance Graphs
R
DSON
vs. T
A
7
6
R
DSON
(ohms)
FD1257AH
R
DSON
vs. V
DD
7
6
R
DS ON
(o h m s)
5
4
3
2
5
4
3
2
1
0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Vdd=2.5V
Vdd= 5V
Vdd=12V
Vdd=17V
Ta = -40
Ta = 25
Ta = 85
1
0
0 1 2
3 4 5
6 7 8
9 10 11 12 13 14 15 16 17 18
T
A
(
o
C)
V
DD
(volts)
Figure.4
Figure.5
Magnetic parameters vs. T
A
60
50
40
30
20
10
0
-10
-20
-30
-40
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
T
A
( C)
o
Magnetic parameters vs. V
DD
50
Magnetic field (G auss)
Magn etic field(G au ss)
Bop, Vdd=2.5V
Brp, Vdd=2.5V
Bhyst, Vdd=2.5V
Bop, Vdd=17V
Brp, Vdd=17V
Bhyst, dd=17V
40
30
20
10
0
-10
-20
-30
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
V
DD
(volts)
Bop, Ta=25
Brp, Ta=25
Bhyst, Ta=25
Figure.6
Figure.7
I
DD
vs T
A
4.5
4
3.5
3
I
DD
(mA)
I
DD
vs V
DD
4.5
4
3.5
3
I
DD
(mA)
Vdd=2.5V
Vdd= 5V
Vdd=12V
Vdd=17V
2.5
2
1.5
1
0.5
0
-40 -30 -20 -10
0
10
20
o
2.5
2
1.5
1
0.5
0
Ta = -40
Ta = 25
Ta = 85
30
40
50
60
70
80
90
0 1
2 3 4 5 6
7 8 9 10 11 12 13 14 15 16 17 18
V
DD
(volts)
T
A
( C)
Figure.8
Figure.9
Rev1.2 Aug. 25, 2009
P.5
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