LB11852FV Datasheet, PDF (1/12 Pages) Sanyo Semicon Device – Monolithic Digital IC For Fan Motor Single-phase Full-wave Pre-driver with Speed Control Function

Ordering number : ENA1112
LB11852FV
Monolithic Digital IC
For Fan Motor
Single-phase Full-wave Pre-driver
with Speed Control Function
Overview
The LB11852FV 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 LB11852FV, 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
• FG (rotational speed detection) output
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
40208 MS PC 20080225-S00005 No.A1112-1/12