Datenblatt-Suchmaschine für elektronische Bauteile |
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LB11852FV Datenblatt(PDF) 11 Page - ON Semiconductor |
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LB11852FV Datenblatt(HTML) 11 Page - ON Semiconductor |
11 / 12 page LB11852FV No.A1112-11/12 〈LIM pin〉 The minimum speed is determined by the voltage of the LIM pin. 1) Obtain the ratio of the minimum speed required to the maximum speed. Ra = Minimum/maximum speed … (1) In the example shown in the figure above : Ra = minimum/maximum speed = 3000/10000 = 0.3 2) Obtain the product of the duty ratio at which the maximum speed is achieved and the value in formula (1). Ca = Maximum speed duty ratio × Ra … (2) In the example given : Ca = maximum speed duty ratio × Ra = 0.8 × 0.3 = 0.24 3) Obtain the required LIM pin voltage. LIM = 5 - (3 × Ca) … (3) In the example given : LIM = 5 - (3 × Ca) = 5 - (3 × 0.24) ≈ 4.3V 4) Divide the resistance of 5VREG to generate the LIM voltage. In the example given, the voltage is 4.3V so the resistance ratio is 1 : 6. The resistance is 10k Ω between 5VREG and LIM and 62kΩ between LIM and GND. (RPM) Maximum speed Minimum speed setup 8000 10000 6000 4000 2000 0% 5V 100% 2V CTL Duty(%) CVO pin voltage (V) VREF LIM 5VREG SOFT |
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