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LB11850VA-TLM-H Datenblatt(PDF) 11 Page - ON Semiconductor |
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LB11850VA-TLM-H Datenblatt(HTML) 11 Page - ON Semiconductor |
11 / 14 page LB11850VA No.A0609-11/14 <CVO, CVI pins> These pins determine the position of the slope origin. (When the origin point is at (0%, 0 rpm), CVO and CVI are shorted.) (1) Movement along the X-axis (resistance divided between CVO and GND) (Example) In the case where the characteristics change from ones with the origin point (0%, 0 rpm) to ones where the speed at a duty ratio of 30% becomes the speed at 0%: First, obtain the input voltage of the CVI pin required at 0%. CVI = 5-(3 ×duty ratio) = 5-(3×0.3) = 5-0.9 = 4.1V Next, obtain the resistances at which the voltage becomes 4.1V by dividing the resistance between CVO and GND when CVO is 5V. The ratio of CVO-CVI: CVI-GND is 0.9V: 4.1V = 1: 4.5. Based on the above, the resistance is 20k Ω between CVO and CVI and 91kΩ between CVI and GND. Furthermore, the slope changes. (In the case of the example given, since the resistance ratio is 1: 4.5, the slope is now 4.5/5.5 = 0.8 times what it was originally.) If necessary, change the resistance of the RC pin, and adjust the slope. CTL VREF CVI SOFT LIM C CVO CTL R4 R5 (RPM) CTL Duty(%) Motor at maximum speed 0% 100% Move in the direction of the X-axis |
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Ähnliche Beschreibung - LB11850VA-TLM-H |
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