FAN8404DTF View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
View to exact match
FAN8404DTF Datasheet PDF : 12 Pages
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FAN8404D
Application Information
1. Lock Detection & Automatic Restart
Hall Input
Output
VLDCL
VLDCP
AL
TOFF
TON
Motor lock
detected
Motor lock
Motor lock
cleared
Motor restart
FAN8404D features a lock detection and an automatic restart. The functions can be operated as follows.
1) When the hall signal stop switching, a motor can be locked.
2) The voltage, VLD on pin 3, is increasing until it reaches VLDCL.
3) When the voltage, VLD reaches VLDCL, the alarm output (AL) becomes high as a motor lock has been detected.
4) If LD pin is connected to GND, the lockup protection is disabled.
5) While a motor is locked, the output repeats switching ON / OFF, but the other output is always OFF. The switching time can
be determined by an external capacitor on charging / discharging time of the capacitor, switching ON / OFF time can be
calculated as follows.
TON
=
-C----L----D------×----(---V----L----D-----C----L-----–------V-----L---D-----C-----P----)-
ILDC
TOFF
=
C-----L----D------×----(---V----L----D----C-----L-----–------V-----L---D-----C-----P-----)
ILDD
Where, The CLD is an external capacitor connected to pin 3, LD.
The VLDCL is the clamp voltage on pin 3, LD.
The VLDCP is the comparator voltage on pin 3, LD.
The ILDC is the charging current on pin 3, LD.
The ILDD is the dischaging current on pin 3, LD.
2. Thermal Shut Down
TSD On: All the outputs are off.(Typ. 175°C)
TSD Off: The circuit can be reactivated and begin to operate in a normal condition. (Typ. 150°C)
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