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FAN8903 bảng dữ liệu(PDF) 9 Page - Fairchild Semiconductor |
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FAN8903 bảng dữ liệu(HTML) 9 Page - Fairchild Semiconductor |
9 / 16 page FAN8903(KA3903) 9 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. 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. + − FAN8903 OP-amp Vref OCP 0.8V C2 105 R3 47k RS 10m Ω Vrs MOTOR + − 6 7 Vro 2 V2 Rt 260k NTC A Stall current Vcom Vref Motor current °C + − WINDOW FRAME R4 10K C3 103 COMP VCC Vref End switch V1 5 FAN8903 |
Số phần tương tự - FAN8903 |
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Mô tả tương tự - FAN8903 |
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