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KA3903 Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer KA3903
Beschreibung Power Window Motor Control IC
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 16 Seiten
KA3903 Datasheet, Funktion
FAN8903(KA3903)
Power Window Motor Control IC
www.fairchildsemi.com
Features
• Protections
- Human body protection with a simple switch
- Over current protection with an integrator
- Over voltage protection
- Load dump protection
- Reverse battery voltage protection
• Low off-state quiescent current (150µA)
• Adjustable output control time after
car-key turn-off
• Four selectable operating modes
• Thermal shutdown (TSD)
• Under voltage lockout
Description
The FAN8903 is a monolithic integrated circuit, suitable for
a window motor control and sun roof motor control in auto-
motive systems.
16-DIP-300A
Typical Applications
• Power Window
• Sun Roof
Ordering Information
Device Package Operating Temperature
FAN8903 16-DIP-300A
40°C ~ +90°C
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.2






KA3903 Datasheet, Funktion
Start Stage
BAT.
FAN8903
START KEY
R2
10k
R1
300k
VCC
V1
15
COMP1
+
+
C1
47µF
0.92V
(at VCC=12V)
FAN8903(KA3903)
VCC
UVLO &
REFERENCE
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
R5 Rt
FAN8903
2
Vref3
+
Vct 3
+
V5 4
+
R6 Ct
Q1
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.
TS = 0.05 × (Rt × Ct), where V5 = 0.25V
Ta = 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.
6

6 Page









KA3903 pdf, datenblatt
Typical Application Circuit1
FAN8903(KA3903)
1 GND
VCC
16
Rin
180
Start key
BAT.
12V
390k
+
10µ
Vref
2
Start
15
Ct
3
Down
14
FAN8903
Step
4
F/C
5
UP
13
+
Cin
47µ
4.7k
104
4.7k
104
474
68k
A/O
6
CS
7
OUT 1
8
M1
12
M2
11
OUT 2
10
M1
M2
PG
9
Relay
Down S/W
Up S/W
M
RS
20m
12

12 Page





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