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FAN8903 bảng dữ liệu(PDF) 6 Page - Fairchild Semiconductor

tên linh kiện FAN8903
Giải thích chi tiết về linh kiện  Power Window Motor Control IC
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nhà sản xuất  FAIRCHILD [Fairchild Semiconductor]
Trang chủ  http://www.fairchildsemi.com
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FAN8903 bảng dữ liệu(HTML) 6 Page - Fairchild Semiconductor

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FAN8903(KA3903)
6
Start Stage
In the state of the start-key turned off, all the blocks in the FAN8903 are kept to be off because the power is not supplied into
UVLO&REFERENCE block.
When the start-key is turned on, the power is supplied into UVLO block to activate reference block in normal condition.
Step and Auto Time
If the up/down switch is pushed less than a set time (Ts), TR (Q1) will be turned off and capacitor (Ct) is charged exponentially
until Vct equals to V5. At that time TR (Q1) is turned on and stops the operation.
But if longer than TS, capacitor (Ct) continues its charge until Vct equals to Vref3. Then Q1 is turned on and the auto function
terminates its operation.
The TS and Ta(auto time) were determinate by components (Rt & Ct), external divider and Vref3.
In the manual mode, the window goes up or down just while a switch is pushed. In the step mode and the auto mode, even after
releasing the switch, the window continues its movements except for pushing the switch again (the topple) or happening to the
stall condition.
+
VCC
COMP1
0.92V
(at VCC=12V)
VCC
BAT.
R1
300k
C1
47
µF
START KEY
V1
R2
10k
UVLO &
REFERENCE
15
+
FAN8903
+
+
Vref3
Q1
Ct
Vct
Rt
R5
V5
R6
+
FAN8903
2
3
4
T
S
0.05
Rt
Ct
×
()
×
where V5 = 0.25V
,
=
T
a
2.10
Rt
Ct
×
()
×
where Vref3 = 4.4V
,
=


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