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LB11868V Datenblatt(PDF) 6 Page - ON Semiconductor

Teilenummer LB11868V
Bauteilbeschribung  Variable Speed Single-phase Full-wave Pre-driver
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LB11868V Datenblatt(HTML) 6 Page - ON Semiconductor

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LB11868V
No.A1915-6/11
*6. CPWM pin
Pin to connect the capacitor for generation of the PWM basic frequency
The use of CP = 220pF causes oscillation at f = 30kHz (typical), which is the basic frequency of PWM.
As this is used also for the current limiting canceling signal, ON-time start function and Soft start function, be sure to
connect the capacitor even when the speed control is not made.
*7. RMI pin
Minimum speed setting pin.
Perform pull-up with REG when this pin is not to be used.
If the IC power supply is likely to be turned OFF first when the pin is used with external power supply, be sure to
insert the current limiting resistor to prevent inflow of large current. (The same applies to the VTH pin.)
*8. VTH pin
Speed control pin.
Connect this pin to GND when it is not used (at full speed).
For the control method, refer to the timing chart.
For control with pulse input, insert the current limiting resistor and use the pin with the frequency of 20kHz to 100kHz
(20kHz to 50kHz recommended).
*9. SENSE pin
Current limiting detection pin.
When the pin voltage exceeds VLIM, the current is limited and the operation enters the lower regeneration mode.
Connect this pin to GND when it is not to be used.
*10. FG pin
Rotational speed detection pin.
Open collector output that can detect rotational speeds by the FG output in response to the phase switching signal.
Keep this pin open when it is not to be used.
It is recommended that a current-limiting resistor with a resistance of 1kΩ or more be inserted in order to protect the
pin during unplugging and plugging the connector or when mistakes are made in connection.
*11. RD pin
Lock detection pin
In open collector output, L upon rotation and H when locked (using pull-up resistance).
Keep this pin open when it is not to be used.
*12. CT pin
Pin to connect the lock detection capacitor.
The constant-current charge and discharge circuits incorporated cause locking when the pin voltage becomes VCTH
and unlocking when it is VCTL.
Connect the pin to GND when it is not to be used (locking not necessary).
*13. S-S pin
Pin to connect the soft-start setting capacitor.
Connect the capacitor between REG and S-S pin.
This pin enables setting of the soft start time according to the capacity of the capacitor.
See the timing char.
Connect the pin to GND when it is not to be used.
*14. OTS pin
Pin to connect the ON-time start setting capacitor.
A constant-current charging circuit and a discharging circuit based on the control duty ratio are incorporated, and
when the pin voltage exceeds VOTS, the CT pin is discharged and the S-S pin is charged.
Connect the pin to GND when it is not to be used (when the lowest speed setting is used).


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