AH2985

AH2985
TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
Pin Assignments
NEW PRODUCT
The AH2985 is a single-chip solution for driving two-coil brushless
direct current (BLDC) fans and motors. The device includes a Halleffect sensor, dynamic offset correction and two complementary
open-drain output drivers with internal Zener diode protection. It is
optimized for low start-up voltage.
(Top View)
AH2985
1 : VDD
To help protect the motor coils, the AH2985 provides Rotor Lock
Protection which shuts down output drives if rotor lock is detected.
The device automatically re-starts when the rotor lock is removed.
Over temperature shutdown provides thermal protection for the
device.
2 : DO
3 : DOB
4 : GND
The AH2985 is available in TO94 package.
1 2







Single-Chip Solution
Operating Voltage: 2.5V to 15V
Built-in Hall Sensor and Input Amplifier
Rotor Lock Protection (Lock Detection, Output Shutdown and
Automatic re-Start)
Built-in Reverse Voltage Protection Diode
Built-in Zener Protection for Output Drivers
Average Output Current up to 500mA
Package: TO94
“Green” Molding Compound
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
4
TO94
Features




3
Applications


Two-Coil BLDC Cooling Fans
Low Voltage/ Low Power BLDC Motors
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit (Note 4)
12V
D2
VDD
AH2985
L1
VDD
1
L2
DO DOB GND
2
3
4
GND
D1
C
12V Brushless DC Fan
Note:
4. D1 (Zener Diode) and Capacitor C are for power stabilization. Recommended value of C is 1μF/ 50V (E-Cap). Diode D2 is optional and helps to protect the
device and fan coils from reverse power conditions. The AH2985 also includes an internal reverse blocking diode at VDD pin.
AH2985
Document number: DS38175 Rev. 1 - 2
1 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
NEW PRODUCT
Pin Descriptions
Pin Number
Pin Name
Function
1
VDD
Input Power
2
DO
Output Pin
3
DOB
Output Pin
4
GND
Ground
Functional Block Diagram
VDD
1
Lock Detect,
Shutdown and
Automatic Re-start
2
Regulator
Hall
Plate
Control Logic
Amp.
3
DO
DOB
4
GND
AH2985
Document number: DS38175 Rev. 1 - 2
2 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 5)
Symbol
Parameter
Rating
Unit
VDD
Supply Voltage
18
V
VRDD
Reverse VDD Polarity Voltage
-15
V
IO(AVE)
500
Output Current (Note 6)
mA
IO(peak as hold)
NEW PRODUCT
PD
TSTG
Notes:
800
Power Dissipation
Storage Temperature
550
mW
-55 to +150
C
TJ
Maximum Junction Temperature
+150
C
JA
Thermal Resistance
227
C/W
JC
Thermal Resistance
49
C/W
5. 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.
6. Shall not exceed PD and Safety Operation Area.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Condition
Min
Max
Unit
Supply Voltage
Operating
2.5
15
V
Operating Ambient Temperature (Note 6)
Operating
-40
+105
C
Symbol
VDD
TA
Parameter
Electrical Characteristics (@TA = +25°C, VDD = 12V, unless otherwise specified.)
Symbol
Condition
Min
Typ
Max
Unit
IDD
Supply Current
Operating, VDD = 12V
–
1
5
mA
tON
Locked Protection On Time
–
–
0.45
–
s
tOFF
Locked Protection Off Time
–
–
2.7
–
s
Locked Protection Duty Ratio
tOFF/ tON
–
6
–
–
IO= 300mA
–
1
1.6
IO= 500mA
–
1
1.8
(Note 7)
20
28
36
RDUTY
RDS(ON)
VZ
Note:
Parameter
Output On Resistance
Output Zener-Breakdown Voltage
Ω
V
7. The VZ value is in D.C voltage measurement. The VZ may vary with coils in A.C. voltage measurements.
AH2985
Document number: DS38175 Rev. 1 - 2
3 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
Magnetic Characteristics (TA = +25C, VDD = 2.5V to 15V, Note 8)
(1mT=10 Gauss)
Parameter
Min
Typ
Max
Unit
BOP
Operate Point
5
30
60
Gauss
BRP
Release Point
-60
-30
-5
Gauss
BHY
Hysteresis
20
60
120
Gauss
8. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Operating Characteristics
DO
RP
OFF
ON
OP
Output Voltage in Volts
DOB
Output Voltage in Volts
NEW PRODUCT
Note:
Symbol
VSAT
BRP
0
OFF
OP
RP
ON
VSAT
BOP
BRP
Magnetic Flux Density in Gauss
0
BOP
Magnetic Flux Density in Gauss
S
Marking side
N
( TO94)
AH2985
Document number: DS38175 Rev. 1 - 2
4 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
Performance Characteristics
(1) TO94
TA(C)
25
50
60
70
80
85
90
95
100
PD(mW)
550
440
396
352
308
286
264
242
220
TA(C)
105
110
115
120
125
130
135
140
150
PD(mW)
198
176
154
132
110
88
66
44
0
NEW PRODUCT
PD (mW)
Power Dissipation Curve
600
500
400
300
200
100
0
-40 0
25
50
75
100
125
150
TA (oC)
AH2985
Document number: DS38175 Rev. 1 - 2
5 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
Ordering Information (Note 9)
NEW PRODUCT
AH2985 - X - X
Part Number
Package Code
AH2985-P-B
Note:
Package
Packing
P: TO94
B : Bulk
Bulk
Packaging
(Note 9)
Quantity
Part Number Suffix
TO94
1000
-B
P
9. For packaging details, go to our website at http://www.diodes.com/products/packages.html.
Marking Information
(1) TO94
(Top View)
Part Number
AH2985
Document number: DS38175 Rev. 1 - 2
2985
Y WW X
Y : Year : 0~9
WW : Week : 01~52, "52" represents
52 and 53 week
X : Internal Code : A~Z : Green
6 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
(1)
Package Type: TO94
0(2x)
L
c
E
b2
A
A3
b
e e1
D
02(2x)
03(2x)
L
Min/Max(in mm)
0.39/0.59
1.85/2.05
Die
1.55/1.75
NEW PRODUCT
01(2x)
TO94
Dim
Min
Max
Typ
A
1.46
1.66
1.56
A3
0.76
b
0.35
0.56
0.39
b2
0.46
c
0.36
0.51
0.38
D
5.12
5.32
5.22
E
3.55
3.75
3.65
e
1.27
e1
3.81
L
13.50 15.50 14.50
L1
1.42
S
0.63
0.83
0.73
θ
6°
θ1
4°
θ2
11°
θ3
6°
All Dimensions in mm
Hall Sensor
AH2985
Document number: DS38175 Rev. 1 - 2
PART MARKING
SURFACE
7 of 8
www.diodes.com
September 2015
© Diodes Incorporated
AH2985
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
NEW PRODUCT
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales
channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and
any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
systems.
Copyright © 2015, Diodes Incorporated
www.diodes.com
AH2985
Document number: DS38175 Rev. 1 - 2
8 of 8
www.diodes.com
September 2015
© Diodes Incorporated
Similar pages