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LB8503V Datasheet(PDF) 9 Page - ON Semiconductor

No. de pieza LB8503V
Descripción Electrónicos  DC Fan Motor Speed Control IC
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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LB8503V Datasheet(HTML) 9 Page - ON Semiconductor

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LB8503V
No.A0366-9/20
Pin Setting Procedures (Provided for reference purposes)
[RC pin]
The slope in the speed control diagram is determined by the RC pin time constant.
CTL Duty (%)
(RPM)
0%
100%
Motor
full speed
I LB01771
1. Determine the FG signal frequency (fFG (Hz)) at the motor's highest speed.
(When 2 FG pulses are created on each motor revolution.)
fFG(Hz)=2rpm/60 .........................................................(1)
2. Determine the time constant for the RC pin.
(Let DUTY be the control duty at the highest motor speed. For example, 100% = 1.0, 60% = 0.6)
R×C=DUTY/(3×0.85×fFG) ............................................. (2)
3. Determine the resistor and capacitor values
The range of capacitors that can be used is from 0.01 to 0.015 µF due to the charge capabilities of the RC pin circuit.
Therefore, an appropriate resistor value can be determined from either (3) or (4) below from the result obtained in
step 2 above.
R=(R×C)/0.01
μF.......................................................(3)
R=(R×C)/0.015
μF.....................................................(4)
Note that the temperature characteristics of the curve are determined by the temperature characteristics of the
capacitor connected to the RC pin.
A capacitor with excellent temperature characteristics must be used to minimize motor speed variation with
temperature.


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