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AH280A-SPLA Datasheet(PDF) 4 Page - Anachip Corp

Part # AH280A-SPLA
Description  Hall-Effect Smart Fan Driver
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Manufacturer  ANACHIP [Anachip Corp]
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AH280A-SPLA Datasheet(HTML) 4 Page - Anachip Corp

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AH280
Hall-Effect Smart Fan Driver
Anachip Corp.
www.anachip.com.tw
Rev. 0.7 Apr 16, 2004
4/7
Rotation detection
The automatic restart circuit detects a motor lock
condition and automatically turns off the output
current. When the lock condition is cleared, the IC
automatically restarts and allows the motor to run.
In the AH280, automatic restart is performed in the
following manner.
A motor lock condition is
detected when the Hall signal stops switching.
The output is ON when CT pin is being charged,
and OFF when CT pin is being discharged.
OFF
ON
CT
clamp
voltage
CT
comparator
voltage
T
off*
T
on*
CT
Motor locked
Motor locked detected
Motor output
Hall input
Motor locked
cleared
Reverts to normal operation
Output ON time (Ton) and OFF time (Toff)
Determined by the CT pin capacitor
Where
Ton=
CHG
I
)
CP
V
CL
(V
C
×
(sec)
Toff=
DHG
I
)
CP
V
CL
(V
C
×
(sec)
C is the capacitance of the CT pin external capacitor
VCL is the CT pin clamp voltage
VCP is the CT pin comparator voltage
ICHG is the CT pin charge current
IDHG is the CT pin discharge current


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