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FAN8903 bảng dữ liệu(PDF) 6 Page - Fairchild Semiconductor |
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FAN8903 bảng dữ liệu(HTML) 6 Page - Fairchild Semiconductor |
6 / 16 page FAN8903(KA3903) 6 Start Stage 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 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. 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. + − VCC COMP1 0.92V (at VCC=12V) VCC BAT. R1 300k C1 47 µF START KEY V1 R2 10k UVLO & REFERENCE 15 + FAN8903 + − + − Vref3 Q1 Ct Vct Rt R5 V5 R6 + FAN8903 2 3 4 T S 0.05 Rt Ct × () × where V5 = 0.25V , = T a 2.10 Rt Ct × () × where Vref3 = 4.4V , = |
Số phần tương tự - FAN8903 |
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Mô tả tương tự - FAN8903 |
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