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LB11850VA-TLM-H Datenblatt(PDF) 11 Page - ON Semiconductor

Teilenummer LB11850VA-TLM-H
Bauteilbeschribung  For Fan Motor Single-Phase Full-Wave Pre-Driver with Speed Control Function
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
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LB11850VA-TLM-H Datenblatt(HTML) 11 Page - ON Semiconductor

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LB11850VA
No.A0609-11/14
<CVO, CVI pins>
These pins determine the position of the slope origin. (When the origin point is at (0%, 0 rpm), CVO and CVI are
shorted.)
(1) Movement along the X-axis (resistance divided between CVO and GND)
(Example) In the case where the characteristics change from ones with the origin point (0%, 0 rpm) to ones where the
speed at a duty ratio of 30% becomes the speed at 0%:
First, obtain the input voltage of the CVI pin required at 0%.
CVI = 5-(3
×duty ratio) = 5-(3×0.3) = 5-0.9 = 4.1V
Next, obtain the resistances at which the voltage becomes 4.1V by dividing the resistance between CVO and GND
when CVO is 5V. The ratio of CVO-CVI: CVI-GND is 0.9V: 4.1V = 1: 4.5.
Based on the above, the resistance is 20k
Ω between CVO and CVI and 91kΩ between CVI and GND.
Furthermore, the slope changes. (In the case of the example given, since the resistance ratio is 1: 4.5, the slope is now
4.5/5.5 = 0.8 times what it was originally.)
If necessary, change the resistance of the RC pin, and adjust the slope.
CTL
VREF
CVI
SOFT
LIM
C
CVO
CTL
R4
R5
(RPM)
CTL Duty(%)
Motor
at maximum speed
0%
100%
Move in the direction
of the X-axis


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