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 

FAN8903(KA3903)

FAN8903

2

NTC

MOTOR

Rt

260k

C2

105

Vrs

R3

V2

RS

47k

10mΩ

6

OP-amp

7

−

+

Vref

Vro

−

0.8V +

A

OCP

Stall current

Motor current

Vref

Vcom

°C

Human Body Protection(HBP)

Using An End Switch

The human body protection is to be carried out when the over current protection signal is issued just while the window glass

is up going and the end switch is closed, in the auto mode. The controller stop the window glass, and then reverses the rotating

direction of motor to move down the window at the bottom.

There are some cases in the window glass to be locked; its upper limit, bottom, and obstacle like human body, neck, and hand

etc. The OCP function would work in any cases. So it is necessary for the controller to discriminate whether something is

squeezed between the window glass and the window frame or not.

The end switch is opened only when the window glass reaches almost its upper limit.

Leave the F/C pin open unless you want this function.

WINDOW

FRAME

End

switch

R4

10K

V1

C3

103

FAN8903

VCC

Vref

+

5

−

COMP

Using Photo Devices (No Touch Sensor)

In case of using an end switch, the HBP function works on the condition that the over current signal is issued.

So it could have some sensitivity problem. It is very hard to decide what the optimal reference current and cancel time are.

We have tested new principle and as a result, developed one light based HBP function. The below figure explain the principle

of the operation.

As sender and receiver are arranged together, it is possible for the receiver to detect the sent diode light.

9

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