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PDF LB11852RV Data sheet ( Hoja de datos )
| Número de pieza | LB11852RV | |
| Descripción | Single-phase Full-wave Pre-driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LB11852RV (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Ordering number : ENA2133
LB11852RV
Monolithic Digital IC
For Fan Motor
Single-phase Full-wave Pre-driver
with Speed Control Function
http://onsemi.com
Overview
The LB11852RV is a single-phase bipolar driving motor pre-driver with a speed control function based on speed
feedback. With a small number of external parts, a highly efficient and very quiet variable-speed drive fan motor with
low power consumption and high rotational accuracy can be implemented. The LB11852RV, integrated in a miniature
package, is best suited for driving small fan motors requiring speed control.
Features
• Single-phase full-wave driving pre-driver
⇒ With a PMOS-NMOS device used as the external power transistor, low saturation output and a single-phase
full-wave drive enable a high-efficiency drive with low power consumption.
• Speed control circuit incorporated
⇒ Compared with open-loop control, a closed-loop control function that uses speed feedback to control the speed
makes it possible to improve the rotational speed accuracy and reduce the variations in the rotational speed
caused by fluctuations in the supply voltage or load. The separately excited upper direct PWM method is
featured as the variable speed system.
• Variable speed control is possible with external PWM input or analog voltage input
⇒ The speed control input signal is compatible with PWM duty ratio and analog voltages.
• Soft start circuit incorporated
• Minimum speed setting pin
⇒ The minimum speed can be set using an external resistor.
• Current limiting circuit incorporated
⇒ Chopper type current limit at startup or lock.
• Reactive current cut circuit incorporated
⇒ Reactive current before phase changeover is cut, ensuring highly silent and low power-consumption drive.
• Automatic resetting type constraint circuit incorporated
• RD (lock detection) output
Semiconductor Components Industries, LLC, 2013
May, 2013
O1012NK 20120913-S00011 No.A2133-1/12
1 page  
Block Diagram
LB11852RV
No.A2133-5/12
5 Page 
LB11852RV
〈LIM pin〉
The minimum speed is determined by the voltage of the LIM pin.
(RPM)
Maximum speed 10000
8000
6000
4000
Minimum
speed setup 2000
0% CTL Duty(%)
5V CVO pin voltage (V)
100%
2V
1) Obtain the ratio of the minimum speed required to the maximum speed.
Ra = Minimum/maximum speed … (1)
In the example shown in the figure above : Ra = minimum/maximum speed = 3000/10000 = 0.3
2) Obtain the product of the duty ratio at which the maximum speed is achieved and the value in formula (1).
Ca = Maximum speed duty ratio × Ra … (2)
In the example given : Ca = maximum speed duty ratio × Ra = 0.8 × 0.3 = 0.24
3) Obtain the required LIM pin voltage.
LIM = 5 - (3 × Ca) … (3)
In the example given : LIM = 5 - (3 × Ca) = 5 - (3 × 0.24) ≈ 4.3V
4) Divide the resistance of 5VREG to generate the LIM voltage.
In the example given, the voltage is 4.3V so the resistance ratio is 1 : 6.
The resistance is 10kΩ between 5VREG and LIM and 62kΩ between LIM and GND.
5VREG
LIM
SOFT
CVI
VREF
No.A2133-11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LB11852RV.PDF ] | |
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