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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
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)
General Description
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 D1 C1 Dz
FG
FG
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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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Ordering Information
AH 5798 - XX G - 13
Package Y : SOT89-5L
Green
Packing 13 : Tape & Reel
13" Tape and Reel Part Number Suffix Quantity 2500/Tape & Reel -13
G : Green
Packaging (Note 2) SOT89-5L
Device AH5798-YG-13
Notes:
Package Code Y
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 Vss 2 5 FG NC 7 O2 4
O1 3
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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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Block Diagram
Vdd
Power Frequency Generator
FG
O1
Hall Sensor AMP Logic Block Lock Detector Soft Switching Control Full Bridge Driver
O2
Vss
Operating
Magentic
S N
O2 O1
FG Normal spinning
Ton
Toff Mechanical lock "Re-start spinning" motor locked cleared
motor locked detected
Notes:
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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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 100s typ.
Absolute Maximum Ratings
Symbol Vdd IO(PEAK) PD TST
(Unless otherwise noted, at TA= 25C)
Characteristics Supply voltage Maximum Output Current (Peak) Power Dissipation Storage Temperature Range
Values 6 800 800 -65 ~ 150
Unit V mA mW o C
SOT89-5L
Recommended Operating Conditions
Symbol TA Vdd Parameter Operating Ambient Temperature Range Supply Voltage
(TA = 25C)
Conditions Operating Operating
Rating -40 ~ 105 1.8~5.5
Unit
o
C V
AH5798 Rev. 1
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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Electrical Characteristics
Symbol Idd VOH VOL TSW ILEAK VFGOL TON RDR Characteristics
(TA = 25C, Vdd = 5V )
Conditions No Load IOUT = 300mA IOUT = 300mA 50 load on out1/out2 IFG = 5mA TOFF / TON
Min 4.4 350 -
Typ. 5 4.65 0.35 100 500 10
Max 0.6 5 0.4 650 -
Unit mA V V s A V ms
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
(TA=25C, Vdd=1.8V~5V, Note 7) (1mT = 10 G)
Symbol Bop Brp Bhy
Notes:
Characteristic Operate Point Release Point Hysteresis
Min 10 -50 -
Typ. 25 -25 50
Max 50 -10 -
Unit G G 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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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Operating Characteristics
O1 VOH Output Voltage in Volts RP OFF Output Voltage in Volts OFF OP O2 VOH
ON
OP VOL Brp 0 Bop
RP VOL Brp 0 Bop
ON
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
S
Marking side
N
(SOT89-5L)
AH5798 Rev. 1
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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
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
P D (m W )
900 800 700 600 500 400 300 200 100 0 -40 0 25
Pow er D issipation C urve
50
75
10 0 105
125
1 50
T A (C )
Marking Information
(1) SOT89-5L
( Top View )
5
4
7 XX Y W X
1
Device AH5798
2
3
Package SOT89-5L
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
AH5798 Rev. 1
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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Package Information
(1) Package type: SOT89-5L
(All Dimensions in mm)
Sensor Location
AH5798 Rev. 1
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AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
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