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AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Description
The AH5792 is a single chip solution for driving single-coil
brush-less DC fans and motors. The AH5792 employs a
bidirectional full bridge driver output stage for single coil fan
motor applications. The device includes features such as
Rotor Lock Protection with rotor lock detection and automatic
self-restart to avoid damage to the coil when the rotor is
blocked.
The AH5792 also offers an externally controlled Tachometer
(Frequency Generator Pin) open -drain output which makes it
easier to connect with external interface such as hardware
monitoring. The FG is half (1/2) the magnetic change
frequency.
The devices are packaged in SOT553 and SOT 89-5L small
outline packages for applications such as small motors like
vibration motors or ultra thin cooling fans.
Pin Assignments
( Top View )
1
O2
2
V
SS
O1
O2
1
2
Vss
3 7
O1
SOT553
( Top View )
SOT89-5L
5
FG
NC
43
Vdd
FG
5
NC
4
Vdd
Features
• Support single-phase full wave min fan driver
• Built-in Hall sensor input amplifier
• Low voltage startup ( Vdd=1.8V )
• Lock detection and automatic self-restart
• Without external timing capacitor, Reduces the numbers
of external component required
• FG output
• Low profile package : SOT553 and SOT89-5L
• “Green” Molding Compound
AH5792
Document number: DS314641 Rev. 6 - 2
www.diodes.com
Applications
• 3.3V / 5V Min. DC Fans (Eight Pole)
• Low Voltage / BLDC Motors
• Micro-Vibration Motors
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Typical Application Circuit (Note 1)
SYSTEM
POWER
D1
C1
Dz
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
SYSTEM
POWER
10Kohm
V
dd
FG
FG
AH5792
V
SS
Notes: 1. Reverse connection of power supply may break the device. A countermeasure is needed such as using reverse power protection
diode D1 between power supply and Vdd terminal. In such case of using reverse power protection diode D1 because of there is no
way to return current to power supply, please take necessary measures like below.
- Connect Dz (Zener diode) between Vdd and Vss terminal, not to exceed the absolute maximum rating voltage.
- Connect a capacitor C1 between Vdd and Vss terminal, to make the path of return current to power supply.
The AH5792 has an open-drain tachometer FG output that follows the half (1/2) the magnetic change frequency. A pull-up resistor
(10Kohm, typically for System Power = 5V) connected to a supply voltage.
O1
O2
Pin Descriptions (Note 2)
Pin Name Description
O1 Output driving & sinking pin 1
Vdd Power supply pin
Vss Ground pin
FG Frequency Generator (Note 2)
O2 Output driving & sinking Pin 2
NC No Connection
Notes: 2. The FG is half (1/2) the magnetic change frequency.
AH5792
Document number: DS314641 Rev. 6 - 2
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© Diodes Incorporated
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Functional Block Diagram
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
V
dd
V
SS
Operating (Note 3, 4, 5)
Magentic
S
N
Hall
Sensor
Power
AMP
Frequency
Generator
Logic
Block
Lock
Detector
FG
O1
Full Bridge
Driver
O2
Out 1
Out 2
FG
Normal spinning
motor locked detected
Notes: 3. In “Normal spinning, the FG shall change its state at each rising edge of OUT2. In “Mechanical lock”, the FG state is kept as the
same as the moment of motor locked detected.
4. When magnetic is locked as “S” pole, then out1 is kept on “L”, out2 is a clock with Ton/Toff ratio. When magnetic is locked at
“N” pole, then out 2 is kept on “L”, out 1 is a clock with Ton/Toff ratio.
5. When “Re-start spinning” occurs, the motor shall ramp up to the “Normal Spinning” speed from zero. It depends on the motor
characteristics.
Ton
Toff
Mechanical lock
“Re-start spinning”
motor locked cleared
AH5792
Document number: DS314641 Rev. 6 - 2
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© Diodes Incorporated
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AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Absolute Maximum Ratings (T
Symbol Characteristics Values Unit
Vdd Supply voltage 6 V
I
Maximum Output Current (Peak)
O(PEAK)
PD Power Dissipation
TST Storage Temperature Range -65 ~ 150
= 25°C, unless otherwise noted)
A
SOT553 400 mA
SOT89-5L 500 mA
SOT553 230 mW
SOT89-5L 800 mW
o
C
Recommended Operating Conditions (T
= 25°C)
A
Symbol Parameter Conditions Rating Unit
Vdd Supply Voltage Operating 1.8 to 5.0 V
TA Operating Temperature Range Operating -40 to +100
Electrical Characteristics (TA = 25°C, Vdd = 5.0V)
Symbol Characteristic Conditions Min Typ. Max Unit
Idd Supply Current No Load - 3.5 5 mA
= 200mA
I
OUT
VOH Output Voltage High
(For SOT553)
I
= 300mA
OUT
(For SOT89-5L)
= 200mA
I
OUT
VOL Output Voltage Low
(For SOT553)
I
= 300mA
OUT
(For SOT89-5L)
I
Output Current RL=30Ω - 148 - mA
OUT
I
FG Output Leakage Current - - 5 μA
Leak
IFG FG Output Current V
= 0.4V 5 - - mA
FGOL
4.4 - - V
- - 0.6 V
°C
V
FG Output Voltage Low I
FGOL
= 5mA - - 0.4 V
FG
TON On Time - 215 - ms
RDR Duty Ratio T
/ TON - 10 -
OFF
AH5792
Document number: DS314641 Rev. 6 - 2
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AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Magnetic Characteristics (T
Symbol
Bop Operate Point 10 30 50 G
Brp Release Point -50 -30 -10 G
Bhy Hysteresis - 60 - G
Notes: 6. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Operating Characteristics
O2
= 25°C, Vdd = 1.8V~5.0V, Note 6)
A
Parameter
(1mT = 10 G)
Min Typ. Max Unit
O1
V
OH
OFF
OP
OFF
RP
Output Voltage in Volts
V
OL
V
OL
BopBrp 0BopBrp 0
Magnetic Flux Density in GaussMagnetic Flux Density in Gauss
OP
ON
Output Voltage in Volts
RP
ON
V
OH
S
Marking side
S
Marking side
AH5792
Document number: DS314641 Rev. 6 - 2
N
(SOT553)
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N
(SOT89-5L)
July 2010
© Diodes Incorporated
Page 6
Performance Characteristics
(1) SOT553
TA (°C)
PD (mW)
25 50 60 70 80 85 90 100 110 120 130 140 150
230 184 166 147 129 120 110 92 74 55 37 18 0
P
(mW )
D
300
200
100
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Power Dissipation Curve
0
0 25 50 75 100 125 150
85-40
TA (oC)
(2) SOT89-5L
TA (°C)
25 50 60 70 75 80 85 90 95 100
PD (mW) 800 640 576 512 480 448 416 384 352 320
TA (°C)
105 110 115 120 125 130 135 140 145 150
PD (mW) 288 256 224 192 160 128 96 64 32 0
P
(m W)
D
900
800
700
600
500
400
300
200
100
0
0 25 50 75 100 125 150
-40
Power Dissipation Curve
AH5792
Document number: DS314641 Rev. 6 - 2
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TA (°C )
July 2010
© Diodes Incorporated
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Ordering Information
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
AH 5792 - X G - X
Package Green
Z : SOT553
G : Green 7/13 : Tape & Reel
Y : SOT89-5L
Device
AH5792-ZG-7 Z SOT553 3000/Tape & Reel -7
AH5792-YG-13 Y
Notes: 7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
8. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
Package
Code
Packaging
(Note 7 & 8)
SOT89-5L 2500/Tape & Reel -13
Quantity Part Number Suffix
Packing
7”/13” Tape and Reel
Marking Information
(1) SOT553
( Top View )
XX
: Identification Code
Y : Year : 0~9
W
XX Y W X
: Week : A~Z : 1~26 week;
a~z : 27~52 week;
z represents 52 and 53 week
X
: A~Z : Green
Part Number Package Identification Code
AH5792 SOT553 KE
(2) SOT89-5L
( Top View )
AH5792
Document number: DS314641 Rev. 6 - 2
5
XX
Y W X
1 2 3
Part Number Package Identification Code
AH5792 SOT89-5L KF
4
7
XX
: Identification code
Y : Year : 0~9
W
: Week : A~Z : 1~26 week;
a~z : 27~52 week;
z represents 52 and 53 week
: Internal code
X
A~Z : Green
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SINGLE PHASE HALL EFFECT LATCH SMART
Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SOT553
AH5792
FAN MOTOR CONTROLLER
D
1.55/1.70
1.50/1.70
D
0.30 C
1.0Typ.
C
L
A
0.30 C D
0.10/0.18
°
8
~
°
6
1.0Typ.
C
L
5x-0.5
0.1
0.45/0.67
C
L
0.32/0.58
1.10/1.25
Hall Sensor
Pin1
0.30 C
0.5Typ.
6
°
~
8°
0.15/0.30(5x)
B
0.10
M C A-B D
C
L
1.2
Pin1
0.5Typ.
0.3
Land Pattern Recommendation
(Unit:mm)
2.2
1.7
Top View
6
°
~
8°
0.55/0.62
AH5792
Document number: DS314641 Rev. 6 - 2
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Package Outline Dimensions (Continued)
(2) Package type: SOT89-5L
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Sensor Location
AH5792
Document number: DS314641 Rev. 6 - 2
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July 2010
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AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
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).
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 In corporated convey any
license under its patent or trademark rights, nor the rights of others. Any Customer or user of this documen t 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.
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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 dev ices 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 © 2010, Diodes Incorporated
www.diodes.com
AH5792
Document number: DS314641 Rev. 6 - 2
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© Diodes Incorporated
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