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PDF AH288 Data sheet ( Hoja de datos )

Número de pieza AH288
Descripción HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Fabricantes Diodes Incorporated 
Logotipo Diodes Incorporated Logotipo



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Features
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
General Description
On chip Hall sensor
Rotor-locked shutdown
Automatically restart
Frequency generator (FG) output
Built-in Zener protection for output driver
Operating voltage: 3.8V~28V
Output current: IO(AVE) = 400mA
Lead Free Package: SOT89-5L (Note 1)
SOT89-5L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 2)
AH288 is a monolithic fan motor controller with Hall sensor’s
capability. It contains two complementary open-drain transistors
as motor coil drivers, automatic lock current shutdown, and
recovery protections. Additional, frequency generator (FG) output
is for speed detection relatively.
Rotor-lock shutdown detection circuit turns off the output driver
when the rotor is blocked to avoid coil overheat. Then, the
automatic recovery circuit will restart the motor. These protected
actions are repeated and periodic during the blocked period. Until
the blocking is removed, the motor recovers and runs normally.
Typical Application Circuit
Vdd (24V)
D2
D1 Rpu
FG
D3 C1
* Rpu : typical 10 Kohm
54
288
123
GND
Coil2
Coil1
48V
48V
Note: The optional Capacitor C1 and Diode D3 are for power stabilization. C1 is recommended to
be E-Cap., luF/25V; D3 is recommended to be Zener Diode, VZ =27V. Which C1and D3
value need to be fine tuned to optimize design for different coils and power suppliers .
24V DC Brush-less Fan with FG output function
AH288 Rev. 12
DS31040
1 of 9
www.diodes.com
APRIL 2010
© Diodes Incorporated

1 page




AH288 pdf
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Electrical Characteristics (TA = 25 °C, Vdd = 24V, unless otherwise specified)
Symbol
ICC
IOFF
TLRP-ON
TLRP-OFF
VOUT(SAT)
RDS(ON)
VOL
VZ
Parameter
Supply Current
Output Leakage Current
Locked Protection On
Locked Protection Off
Output Saturation Voltage
Output On Resistance
FG Output Vds
Output Zener-breakdown Voltage
Conditions
Operating
VOUT = 24V
IO = 200mA
IO = 300mA
IO = 200mA
IO = 10mA
Min Typ. Max Unit
- 2 4 mA
- < 0.1 10 μA
0.4 0.46 0.6 Sec
2.4 2.76 3.6 Sec
- 450 700
mV
- 680 800
- 2.25 3.5 ohm
- 0.3 0.5 V
42 55 65 V
Truth Table
IN-
H
L
-
IN+
L
H
-
CT OUT1 OUT2 FG
LHLH
L LHL
H off off
-
Mode
Rotating
Rotating
Lockup protection activated
Magnetic Characteristics (TA = 25 °C, Vdd = 24V, unless otherwise specified, Note 7)
(1mT=10 Gauss)
Symbol
Characteristics
Min Typ.
Max
Unit
Bop Operate Point
Brp Release Point
Bhy Hysteresis
10 30
60 Gauss
-60 -30 -10 Gauss
- 60
- Gauss
Notes: 7. Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering.
AH288 Rev. 12
DS31040
5 of 9
www.diodes.com
APRIL 2010
© Diodes Incorporated

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