KA3903 FAIRCHILD [Fairchild Semiconductor], KA3903 Datasheet - Page 7

• Manufacturer Part Number: KA3903
• Description: Power Window Motor Control IC
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

FAN8903(KA3903)
Car-key Turn-off Function
The window can be operated for a certain period even in the state of the start-key to be off. If the start-key is turned off, the dis-
charge time for the voltage V1 to pin #15 will be determined by the following time constant.
User can get a time he wants as the discharge time for the voltage V1 by changing the capacity of the cap (C1) and the values
of the resistances (R1 or R2).
Therefore, the user can operate the window for a limited time (about 30sec) even if the start-key is turned off
Mode Selection
Notes:
1. L : M1 or M2 = Ground, H : M1 or M2 = Open
2. NORMAL: The window is working as long as the up or down switch is pressed.
3. TOGGLE: When the window works by pressing the up or down switch, the window is stopped if the up or down switch is
4. STEP & AUTO: If the up or down switch is pressed for a certain period (0.3 seconds), the window works for 0.3 seconds,
Over Voltage Protection(OVP)
It is designed stop the control of the FAN8903 if battery voltage is sensed as about 18.6V or more.
LL-MODE
LH-MODE
HL-MODE
HH-MODE
pressed once more.
while 6 seconds if pressed for more than a certain period (0.3 seconds).
=
Mode
R1
+
R2
C1
BAT.
12V
M1
H
H
L
L
Pin Name
Rin
180
M2
H
H
L
L
47 F
16
FAN8903
Normal
Normal
Normal
Toggle, step & Auto
18.6V
UP
Operation
Normal
Toggle & Auto
Toggle, step & Auto
Toggle, step & Auto
DOWN
7