BCD AH287Z4-AE1 Two phase hall effect latch with locked protection Datasheet

Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
General Description
Features
The AH287 is an integrated Hall sensor with output
drivers for brushless DC motor application. This IC
consists of two complementary outputs for motor’s
coil driving and has automatic lock protection and
auto- restart function relatively. To avoid coil burning,
rotor lock shutdown protection circuit shut down the
output driver if the rotor blocked and then the
automatic recovery circuit will try to restart the motor.
This function repeats while rotor is blocked. Until the
blocking is removed, the motor recovers running
normally. In addition, the auto-restart time is flexible
by adjusting the capacitance (CCT).
•
•
•
•
•
•
•
•
•
•
Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold BOP, the
DO is turned to sink and DOB is turned to drive. This
output state is held until a magnetic flux density
reversal falls below BRP, causing DO to be turned to
drive and DOB turned to sink.
AH287
On-chip Hall Sensor
Operating Voltage: 4V to 18V
Maximum Output Current: 350mA (ave)
Rotor-locked Protection
Automatic Restart
Adjustable Auto-restart Time
Internal Band-gap Regulator for Temperature
Compensation
Operating Temperature: -20˚C to 85˚C
Low Profile TO-94 Package
ESD Rating: 300V (Machine Model)
Application
•
Dual-coil Brushless DC Fan
This IC is available in TO-94 package.
TO-94
Figure 1. Package Type of AH287
Aug. 2008
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Pin Configuration
Z4 Package
(TO-94)
GND
4
3
DOB
2
1
DO
CT
Figure 2. Pin Configuration of AH287 (Front View)
Pin Description
Pin Number
Pin Name
1
CT
Timing capacitance
2
DO
Output 1
3
DOB
Output 2
4
GND
Ground
Aug. 2008
Function
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Functional Block Diagram
Temperature
Compensation
Regulator
Hall
Sensor
Amplifier
2
Schmitt
Trigger
Output
Driver
3
Lock
Protection and
Auto Restart
4
DO
DOB
GND
1
CT
Figure 3. Functional Block Diagram of AH287
Ordering Information
AH287
-
E1: Lead Free
G1: Green
Circuit Type
Magnetic Characteristics
A: 10 to 50 Gauss
B: 5 to 70 Gauss
C: 100 Gauss
Package
Z4: TO-94
Package
TO-94
Temperature
Range
-20 to 85°C
Part Number
Marking ID
Lead Free
Green
Lead Free
Green
Packing
Type
AH287Z4-AE1
AH287Z4-AG1
AH287Z4-E1
AH287Z4-G1
Bulk
AH287Z4-BE1
AH287Z4-BG1
AH287Z4-E1
AH287Z4-G1
Bulk
AH287Z4-CE1
AH287Z4-CG1
AH287Z4-E1
AH287Z4-G1
Bulk
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Products with "G1" suffix are available in green package.
Aug. 2008
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
3
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Absolute Maximum Ratings (Note 1, TA=25°C)
Parameter
Symbol
Value
Unit
VCC
20
V
B
Unlimited
Gauss
350
mA
550
mA
750
mA
PD
550
mW
Die to Atmosphere
θJA
227
°C/W
Die to Package Case
θJC
49
°C/W
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-50 to 150
°C
ESD (Machine Model)
300
V
ESD (Human Body Model)
3000
V
Supply Voltage
Magnetic Flux Density
Continuous
Output Current
IOUT
Hold
Peak (Start Up)
Power Dissipation
Thermal
Resistance
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Supply Voltage
VCC
4
18
V
Ambient Temperature
TA
-20
85
°C
Aug. 2008
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
4
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Electrical Characteristics
VCC =14V, TA =25°C, unless otherwise specified.
Parameter
Output Saturation
Voltage
Symbol
VSAT
Conditions
B>150 Gauss, VCC=5V,
VDOB=VCC, IDO=100mA
(or B<-150 Gauss, VCC =5V,
VDO= VCC, IDOB=100mA)
B>150 Gauss,
VDOB= VCC, IDO=350mA
(or B<-150 Gauss,
VDO= VCC, IDOB=350mA)
Min
Typ
Max
Unit
1
1.15
V
1.2
1.35
V
Supply Current
ICC
B>150 Gauss, VDOB=VCC
(or B<-150 Gauss, VDO=VCC)
5
6.5
mA
Output Rise Time
tr
RL=820Ω, CL=20pF
3
10
µs
Output Fall Time
tf
RL=820Ω, CL=20pF
0.3
1.5
µs
∆t
RL=820Ω, CL=20pF
3
10
µs
Switch Time
Differential
Output Zener
Breakdown Voltage
VZ
55
V
5
µA
Charge Current
ICHG
VCT=1 to 2.5V
Discharge Current
IDHG
VCT=3.5 to 2.5V
0.5
µA
Clamp Voltage
VCL
Limiting voltage
3.2
V
Comparator Voltage
VCP
Limiting voltage
2.2
V
Aug. 2008
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Magnetic Characteristics (TA=25°C)
Parameter
Symbol
Operating Point
BOP
Grade
Min
Typ
Max
A
10
50
B
5
70
C
Releasing Point
BRP
Hysteresis
Unit
Gauss
100
A
-50
-10
B
-70
-5
C
-100
BHYS
Gauss
70
Gauss
Test Circuit
Power
Input
AH287
(Front View)
S
CT
Marking Side
1
DOB
2
3
GND
4
RL
820Ω
RL
820Ω
CCT
2.2 µ F
N
CL
20pF
Aug. 2008
DO
Rev. 1. 1
CL
20pF
BCD Semiconductor Manufacturing Limited
6
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
14
14
12
12
10
10
DOB Output (V)
DO Output (V)
Magnetic Hysteresis Characteristics
8
6
8
6
4
4
2
2
0
-100
-50
0
50
0
100
-100
-50
0
50
100
Magnetism (Gauss)
Magnetism (Gauss)
Figure 4. DO Output vs. Magnetism
Figure 5. DOB Output vs. Magnetism
Typical Performance Characteristics
10
6
8
Supply Current (mA)
Supply Current (mA)
5
4
3
2
0
2
4
6
8
10
12
14
16
18
0
20
Supply Voltage (V)
VCC=14V
-20
0
20
40
60
80
o
Ambient Temperature ( C)
Figure 6. Supply Current vs. Supply Voltage
Aug. 2008
4
2
o
TA=25 C
1
6
Figure 7. Supply Current vs. Ambient Temperature
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
7
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Typical Performance Characteristics (Continued)
80
200
150
BOP/BRP/BHYS(Gauss)
BOP/BRP/BHYS (Gauss)
60
100
50
0
-50
-100
BOP
-150
BHYS
-200
40
20
BOP
BRP
0
BHYS
BRP
4
6
8
10
12
14
-20
16
-20
18
0
20
40
60
80
o
Ambient Temperature ( C)
Supply Voltage (V)
Figure 8. BOP/BRP/BHYS vs. Supply Voltage
Figure 9. BOP/BRP/BHYS vs. Ambient Temperature
2.0
800
1.8
Power Dissipation (mW)
Saturation Voltage (V)
1.6
1.4
1.2
1.0
0.8
0.6
VCC=14V
0.4
600
400
200
IOUT=350mA
0.2
0.0
-20
0
20
40
60
0
-25
80
0
25
50
75
100
125
150
o
Ambient Temperature ( C)
o
Ambient Temperature ( C)
Figure 10. Saturation Voltage vs. Ambient Temperature
Figure 11. Power Dissipation vs. Ambient Temperature
( Table 1)
Table 1:
TA (℃)
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
PD (mW)
551
551
551
551
551
551
551
551
551
551
529
507
485
463
441
419
396
374
TA (℃)
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
PD (mW)
352
330
308
264
242
220
198
176
154
132
110
88
66
44
22
0
Aug. 2008
286
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
8
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Typical Application (Note 2)
Note 2:
1. The minimum startup voltage is 3.5V when D1 is disconnected.
2. The capacitances of CCT and C2 are adjustable base on system requirements. The recommended values
are as below:
CCT
C2
1µF/9V~2.2µF/9V
1µF/50V~2.2µF/50V
Figure 12. Typical Application of AH287
Aug. 2008
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
9
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Operating Diagram (Note 3)
Hall Input
ON
OFF
Motor Output
CT
Clamp
Voltage
CT
Comparator
Voltage
CT
Motor lock
cleared
Motor locked
TON
Motor lock detected
TOFF
Reverts to normal operation
Note 3: The automatic restart circuit detects a motor lock condition and automatically turns off the output current.
When the lock is cleared, the IC automatically restarts and allows the motor to run. In AH287, automatic restart
is performed in the following manner. A motor lock condition is detected when the Hall signal stops switching.
The output is ON when CT pin is being charged, and OFF when CT pin is being discharged.
TON =
C * ( VCL − VCP )
(Sec )
ICHG
TOFF =
C * ( VCL − VCP )
(Sec )
IDHG
Output ON time (TON) and OFF time (TOFF) are determined by C, the capacitance of the CT pin external
capacitor.
VCL is the CT pin clamp voltage
VCP is the CT pin comparator voltage
ICHG is the CT pin charge current
IDHG is the CT pin discharge current
Figure 13. Control Timing Diagram of AH287
Aug. 2008
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
10
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION
AH287
Mechanical Dimensions
TO-94
Aug. 2008
Rev. 1. 1
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
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