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 SOT89-5L small
outline packages for applications such as small motors like
vibration motors or ultra thin cooling fans.
Pin Assignments
( Top View )
O2
V
SS
O1
1
2
3
SOT553
( Top View )
O2
Vss
1
2
5 FG
NC
7 Vdd
4
5
FG
NC
4
Vdd
O1 3
SOT89-5L
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
Applications
•
•
•
3.3V / 5V Min. DC Fans (Eight Pole)
Low Voltage / BLDC Motors
Micro-Vibration Motors
AH5792
Document number: DS314641 Rev. 6 - 2
1 of 10
www.diodes.com
July 2010
© Diodes Incorporated
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Typical Application Circuit
(Note 1)
SYSTEM
POWER
10Kohm
SYSTEM
POWER
D1
C1
Dz
V
dd
FG
FG
AH5792
O1
O2
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.
Pin Descriptions
(Note 2)
Pin Name
O1
Vdd
Vss
FG
O2
NC
Notes:
Description
Output driving & sinking pin 1
Power supply pin
Ground pin
Frequency Generator (Note 2)
Output driving & sinking Pin 2
No Connection
2. The FG is half (1/2) the magnetic change frequency.
AH5792
Document number: DS314641 Rev. 6 - 2
2 of 10
www.diodes.com
July 2010
© Diodes Incorporated
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Functional Block Diagram
V
dd
Power
Frequency
Generator
FG
Hall
Sensor
O1
AMP
Logic
Block
Lock
Detector
Full Bridge
Driver
O2
V
SS
Operating
(Note 3, 4, 5)
Magentic
S
N
Out 1
Out 2
FG
Normal spinning
Ton
Toff
Mechanical lock
“Re-start spinning”
motor locked cleared
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.
AH5792
Document number: DS314641 Rev. 6 - 2
3 of 10
www.diodes.com
July 2010
© Diodes Incorporated
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Absolute Maximum Ratings
(T
A
= 25°C, unless otherwise noted)
Symbol
Vdd
I
O(PEAK)
P
D
T
ST
Supply voltage
Maximum Output Current (Peak)
Power Dissipation
Storage Temperature Range
SOT553
SOT89-5L
SOT553
SOT89-5L
Characteristics
Values
6
400
500
230
800
-65 ~ 150
Unit
V
mA
mA
mW
mW
o
C
Recommended Operating Conditions
(T
A
= 25°C)
Symbol
Vdd
T
A
Parameter
Supply Voltage
Operating Temperature Range
Conditions
Operating
Operating
Rating
1.8 to 5.0
-40 to +100
Unit
V
°C
Electrical Characteristics
(T
A
= 25°C, Vdd = 5.0V)
Symbol
Idd
Characteristic
Supply Current
Conditions
No Load
I
OUT
= 200mA
(For SOT553)
I
OUT
= 300mA
(For SOT89-5L)
I
OUT
= 200mA
(For SOT553)
I
OUT
= 300mA
(For SOT89-5L)
R
L
=30Ω
Min
-
Typ.
3.5
Max
5
Unit
mA
V
OH
Output Voltage High
4.4
-
-
V
V
OL
Output Voltage Low
-
-
0.6
V
I
OUT
I
Leak
I
FG
V
FGOL
T
ON
R
DR
Output Current
FG Output Leakage Current
FG Output Current
FG Output Voltage Low
On Time
Duty Ratio
-
-
148
-
-
-
215
10
-
5
-
0.4
-
-
mA
μA
mA
V
ms
V
FGOL
= 0.4V
I
FG
= 5mA
5
-
-
T
OFF
/ T
ON
-
AH5792
Document number: DS314641 Rev. 6 - 2
4 of 10
www.diodes.com
July 2010
© Diodes Incorporated
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Magnetic Characteristics
(T
A
= 25°C, Vdd = 1.8V~5.0V, Note 6)
(1mT = 10 G)
Max
Unit
50
-10
-
G
G
G
Symbol
B
op
Brp
B
hy
Notes:
Parameter
Min
10
-50
-
Typ.
30
-30
60
Operate Point
Release Point
Hysteresis
6. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Operating Characteristics
O2
V
OH
Output Voltage in Volts
RP
OFF
Output Voltage in Volts
OFF
OP
O1
V
OH
ON
OP
V
OL
Brp
0
Bop
RP
V
OL
Brp
0
Bop
ON
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
S
Marking side
S
Marking side
N
(SOT553)
N
(SOT89-5L)
AH5792
Document number: DS314641 Rev. 6 - 2
5 of 10
www.diodes.com
July 2010
© Diodes Incorporated
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