DIODES AH5798-YG-13

AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
General Description
Features
•
•
•
•
•
•
•
•
•
•
•
Support single-phase full wave DC fan driver
Built-in Hall sensor input amplifier
Low voltage startup ( Vdd=1.8V )
Lock detection and automatic self-restart
Soft switching for low noise DC fans
Without external timing capacitor, Reduces the
numbers of external component required
Thermal protection
FG output
Low profile package: SOT89-5L
SOT89-5L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
The AH5798 is a single chip solution for driving single-coil
brush-less DC fans and motors. The AH5798 employs a
bidirectional full bridge driver output stage for single coil fan
motor applications. The soft switching driver generates the low
noise operating for DC fans. 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 AH5798 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 the magnetic change frequency. The
device is packaged in SOT89-5L for SMT applications in DC fans.
Applications
•
•
•
3.3V / 5V Min. BLDC Cooling Fans
Net-Book/ Note-Book DC fans
Low Voltage/ Low Power BLDC Motors
Typical Application Circuit
SYSTEM
POWER
10Kohm
SYSTEM
POWER
Vdd
FG
FG
D1
C1
Dz
AH5798
O1
O2
V SS
* 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 AH5798 has an open-drain tachometer FG output that follows the magnetic change frequency. A pull-up resistor (10Kohm, typically for System
Power = 5V) connected to a supply voltage.
AH5798 Rev. 1
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OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Ordering Information
AH 5798 - XX G - 13
Package
Y : SOT89-5L
Device
Package Code
AH5798-YG-13
Notes:
Y
Green
Packing
G : Green
13 : Tape & Reel
13” Tape and Reel
Part Number Suffix
Quantity
Packaging
(Note 2)
SOT89-5L
2500/Tape & Reel
-13
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
2. 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.
Pin Assignments
(1) SOT89-5L
( Top View )
Vdd 1
5 FG
2
NC
O1 3
74 O2
Vss
Pin Descriptions
Pin Name
Vdd
Vss
O1
O2
NC
FG
Notes:
Description
Power supply pin
Ground pin
Output driving & sinking pin 1
Output driving & sinking Pin 2
No Connection
Frequency Generator (Note 3)
3. The FG is the same as the magnetic change frequency.
AH5798 Rev. 1
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OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Block Diagram
Vdd
FG
Power
Frequency
Generator
O1
Hall
Sensor
AMP
Logic
Block
Soft Switching
Control
Full Bridge
Driver
O2
Lock
Detector
Vss
Operating
Magentic
S
N
O2
O1
Ton
FG
Normal spinning
Toff
Mechanical lock
motor locked detected
Notes:
“Re-start spinning”
motor locked cleared
4. In “Normal spinning, the FG shall change its state at each rising edge of O1.
5. When magnetic is locked as “S” pole, then O2 is kept on “L”, O1 is a clock with Ton/Toff ratio. When magnetic is locked at “N” pole, then O1 is
kept on “L”, O2 is a clock with Ton/Toff ratio.
6. When “Re-start spinning” occurs, the motor shall ramp up to the “Normal Spinning” speed from zero. It depends on the motor characteristics.
AH5798 Rev. 1
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OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Soft Switching
AH5798 is with soft switching of the bidirectional current through the single motor coil is important for low
noise applications.
Vdd
Vout 1
Vout 2
GND
100µs typ.
Absolute Maximum Ratings
Symbol
Vdd
IO(PEAK)
PD
TST
(Unless otherwise noted, at TA= 25°C)
Characteristics
Supply voltage
Maximum Output Current (Peak)
Power Dissipation
Storage Temperature Range
SOT89-5L
Recommended Operating Conditions
Symbol
TA
Vdd
Values
Unit
6
800
800
-65 ~ 150
V
mA
mW
o
C
Unit
(TA = 25°C)
Parameter
Conditions
Rating
Operating Ambient Temperature Range
Supply Voltage
Operating
Operating
-40 ~ 105
1.8~5.5
AH5798 Rev. 1
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OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Electrical Characteristics
Symbol
Idd
VOH
VOL
TSW
ILEAK
VFGOL
TON
RDR
(TA = 25°C, Vdd = 5V )
Characteristics
Conditions
Supply Current
Output Voltage High
Output Voltage Low
Output Switching Slope Duration
FG Output Leakage Current
FG Output Voltage Low
On Time
Duty Ratio
Magnetic Characteristics
No Load
IOUT = 300mA
IOUT = 300mA
50Ω load on out1/out2
IFG = 5mA
TOFF / TON
Min
Typ.
Max
Unit
4.4
350
-
5
4.65
0.35
100
500
10
0.6
5
0.4
650
-
mA
V
V
μs
μA
V
ms
(TA=25°C, Vdd=1.8V~5V, Note 7)
(1mT = 10 G)
Symbol
Notes:
Characteristic
Min
Typ.
Max
Unit
Bop
Operate Point
10
25
50
G
Brp
Release Point
-50
-25
-10
G
Bhy
Hysteresis
-
50
-
G
7. Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering.
AH5798 Rev. 1
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OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Operating Characteristics
O1
O2
VOH
RP
OFF
ON
OP
Output Voltage in Volts
Output Voltage in Volts
VOH
VOL
Brp
0
OFF
OP
RP
ON
VOL
Bop
Brp
Magnetic Flux Density in Gauss
0
Bop
Magnetic Flux Density in Gauss
S
Marking side
N
(SOT89-5L)
AH5798 Rev. 1
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© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Performance Characteristics
(1) SOT89-5L
TA (°C)
PD (mW)
TA (°C)
PD (mW)
25
800
105
288
50
640
110
256
P D (m W )
60
576
115
224
70
512
120
192
75
480
125
160
80
448
130
128
85
416
135
96
90
384
140
64
95
352
145
32
100
320
150
0
Pow er D issipation C urve
900
800
700
600
500
400
300
200
100
0
-400
25
50
75
10 0 105
125
1 50
T A (°C )
Marking Information
(1) SOT89-5L
( Top View )
4
7
5
XX Y W X
1
Device
AH5798
AH5798 Rev. 1
2
3
Package
SOT89-5L
7 of 9
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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
X : Internal code
A~Z : Green
Identification Code
K4
OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Package Information
(All Dimensions in mm)
(1) Package type: SOT89-5L
Sensor Location
AH5798 Rev. 1
8 of 9
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OCTOBER 2009
© Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
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Copyright © 2009, Diodes Incorporated
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AH5798 Rev. 1
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