FAN8903 データシートの表示（PDF） - Fairchild Semiconductor

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FAN8903

Power Window Motor Control IC

Fairchild Semiconductor 

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

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