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Diodes Semiconductor Electronic Components Datasheet

AH5798 Datasheet

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

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AH5798 pdf
Features
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
General Description
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
www.DataSheet4U.com
SYSTEM
POWER
D1
C1 Dz
Vdd
V SS
AH5798
SYSTEM
POWER
10Kohm
FG FG
O1
O2
* 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
1 of 9
www.diodes.com
OCTOBER 2009
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH5798 Datasheet

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

No Preview Available !

AH5798 pdf
Ordering Information
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
AH 5798 - XX G - 13
Package
Y : SOT89-5L
Green
G : Green
Packing
13 : Tape & Reel
Device
AH5798-YG-13
Package Code
Y
Packaging
(Note 2)
SOT89-5L
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
Notes:
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
www.DataSheet4U.com
( Top View )
Vdd 1
5 FG
Vss 2
NC
O1 3
74 O2
Pin Descriptions
Pin Name
Vdd
Vss
O1
O2
NC
FG
Description
Power supply pin
Ground pin
Output driving & sinking pin 1
Output driving & sinking Pin 2
No Connection
Frequency Generator (Note 3)
Notes: 3. The FG is the same as the magnetic change frequency.
AH5798 Rev. 1
2 of 9
www.diodes.com
OCTOBER 2009
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH5798 Datasheet

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

No Preview Available !

AH5798 pdf
Block Diagram
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Vdd Power
Hall
Sensor
AMP
Vss
Frequency
Generator
FG
Logic
Block
Soft Switching Full Bridge
Control
Driver
Lock
Detector
O1
O2
Operating
Magentic
S
N
www.DataSheet4U.coOm2
O1
FG
Normal spinning
Ton Toff
Mechanical lock
motor locked detected
“Re-start spinning”
motor locked cleared
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
3 of 9
www.diodes.com
OCTOBER 2009
© Diodes Incorporated




Part Number AH5798
Description SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Maker Diodes Incorporated
Total Page 9 Pages
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