FAN8903 查看數據表（PDF） - Fairchild Semiconductor

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FAN8903

Power Window Motor Control IC

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.

τ = (R1 + R2)C1

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

Mode

Pin Name

M1

M2

Operation

UP

DOWN

LL-MODE

L

L

Normal

Normal

LH-MODE

L

H

Normal

Toggle & Auto

HL-MODE

H

L

Normal

Toggle, step & Auto

HH-MODE

H

H

Toggle, step & Auto

Toggle, step & Auto

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

pressed once more.

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,

while 6 seconds if pressed for more than a certain period (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.

FAN8903

Rin

180

16

BAT.

12V

47µF

18.6V

7

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