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LB11852FV-MPB-E Scheda tecnica(PDF) 9 Page - ON Semiconductor

Il numero della parte LB11852FV-MPB-E
Spiegazioni elettronici  For Fan Motor
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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LB11852FV-MPB-E Scheda tecnica(HTML) 9 Page - ON Semiconductor

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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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