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LB11852FV-TLM-E Datasheet(PDF) 9 Page - ON Semiconductor |
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LB11852FV-TLM-E Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 12 page LB11852FV No.A1112-9/12 2. Supplementary description of operations By inputting the duty pulses, a feedback loop is formed inside the LB11852 IC to establish the FG period (rotational speed of the motor) that corresponds to the control voltage of the pulses. The operation inside the IC is as flows. pulse signals are created from the edges of the FG signals as shown in the figure below, and using these signals as a reference, waveforms with a pulse width determined by the CR time constant are generated using a one-shot multivibrator. These pulse waveforms are then integrated to control the duty ratio of the pre-driver output as the control voltage. By changing the pulse width as determined by the CR time constant, the VCTL versus rotational speed slope can be adjusted as shown in the speed control diagram in the previous section. However, since pulses that are determined by the CR time constant are used, the CR variations are output as-is as the speed control error. CTL Signal CTL FG LB11852 Closed Feed-Back Loop CONTROL SIGNAL Speed control block Pre-driver block One-shot multivibrator output RC pin Edge pulse FG TRC (sec) = 1.15RC Slope determined by CR time constant |
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