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LB11867FV-MPB-H Datasheet(PDF) 9 Page - ON Semiconductor |
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LB11867FV-MPB-H Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 11 page LB11867FV www.onsemi.com 9 Control timing chart (Speed control) (1) Minimum speed setting (stop) mode The low-speed fan rotation occurs at the minimum speed set with the RMI pin. When the minimum speed is not set (RMI pin pulled up to 5VREG), the motor stops. (2) Low speed high speed PMW control is made by comparing the CPWM oscillation voltage (1.1V 3.0V) and VTH voltage. Both upper and lower output TRs are turned ON when the VTH voltage is low. The upper output TR is turned OFF when the VTH voltage is high, regenerating the coil current in the lower TR. Therefore, as the VTH voltage decreases, the output ON-DUTY increases, causing increase in the coil current, raising the motor rotation speed. The rotation speed can be monitored with the FG output. (3) Full speed mode The full speed mode becomes effective when the VTH voltage is 1.1V or less. (Set VTH = GND when the speed control is not to be made.) 0V 3.0V 1.1V CPWM f=30kHz (CP=220pF) 0% 100% FG ONDUTY VTH voltage RMI voltage Minimum speed setting rotation (stop mode) Low speed High speed PWM control speed variable Full speed |
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