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參數資料
| 型號： | FAN8903 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Power Window Motor Control IC |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, 0.4 A, PDIP16 |
| 封裝： | 0.300 INCH, DIP-16 |
| 文件頁數： | 6/16頁 |
| 文件大?。?/td> | 286K |
| 代理商： | FAN8903 |
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 (T
s
), 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 T
S
, capacitor (Ct) continues its charge until Vct equals to Vref3. Then Q1 is turned on and the auto function
terminates its operation.
The T
S
and Ta(auto time) were determinate by components (Rt & Ct), external divider and Vref3.
T
S
0.05
Rt
Ct
where V5 = 0.25V
,
=
T
a
2.10
Rt
Ct
where Vref3 = 4.4V
,
=
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.
+
V
CC
COMP1
0.92V
(at V
CC
=12V)
V
CC
BAT.
R1
300k
C1
47
μ
F
START KEY
V1
R2
10k
UVLO &
REFERENCE
15
+
FAN8903
+
+
Vref3
Q1
Ct
Vct
Rt
R5
V5
R6
+
FAN8903
2
3
4
×
(
)
×
×
(
)
×
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