lb11852fv Sanyo Semiconductor Corporation, lb11852fv Datasheet

lb11852fv

Manufacturer Part Number

lb11852fv

Description

For Fan Motor Single-phase Full-wave Pre-driver With Speed Control Function

Manufacturer

Sanyo Semiconductor Corporation

Datasheet

1.LB11852FV.pdf (12 pages)

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Ordering number : ENA1112

LB11852FV

Overview

Features

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.

• Single-phase full-wave driving pre-driver

• Speed control circuit incorporated

• Variable speed control is possible with external PWM input or analog voltage input

• Soft start circuit incorporated

• Minimum speed setting pin

• Current limiting circuit incorporated

• Reactive current cut circuit incorporated

• Automatic resetting type constraint circuit incorporated

• FG (rotational speed detection) output

⇒ With a PMOS-NMOS device used as the external power transistor, low saturation output and a single-phase

⇒ Compared with open-loop control, a closed-loop control function that uses speed feedback to control the speed

⇒ The speed control input signal is compatible with PWM duty ratio and analog voltages.

⇒ The minimum speed can be set using an external resistor.

⇒ Chopper type current limit at startup or lock.

⇒ Reactive current before phase changeover is cut, ensuring highly silent and low power-consumption drive.

full-wave drive enable a high-efficiency drive with low power consumption.

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.

"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,

Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to

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

device, the customer should always evaluate and test devices mounted in the customer

equipment.

s products or equipment. To verify symptoms and states that cannot be evaluated in an independent

Monolithic Digital IC

For Fan Motor

Single-phase Full-wave Pre-driver

with Speed Control Function

40208 MS PC 20080225-S00005 No.A1112-1/12

s products or

Related parts for lb11852fv

lb11852fv Summary of contents

Page 1

... LB11852FV 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 ...

Page 2

... CT pin charge current CT pin discharge current CT pin charge/discharge current ratio OUTN pin output H voltage OUTN pin output L voltage OUTP pin output L voltage Hall input sensitivity LB11852FV Conditions HB max Mounted on a specified board *1 Topr Tstg Conditions V CC pin V CC -5VREG ...

Page 3

... V I LIM range SOFT pin charge current I C SOFT SOFT pin operating voltage range V I SOFT Package Dimensions unit : mm (typ) 3360 5 0.5 0.22 0.15 (0.35) SANYO : SSOP20J(225mil) LB11852FV Conditions 5mA 19V -0.2mA 0.2mA 5VREG 1.0 0.8 0.6 0.4 0.2 0 – ...

Page 4

... Truth table Lock protection CPWM = Speed control CPWM Pin Assignment LB11852FV OUT1P OUT1N OUT2P L L OFF OFF H L OFF L OFF OFF H OFF IN + OUT1P OUT1N OUT2P OFF H OFF H L ...

Page 5

... Block Diagram LB11852FV No.A1112-5/12 ...

Page 6

... Sample Application Circuit *3 CTLsignal LB11852FV 1μF/25V 1μF/25V *2 5VREG RC LIM SOFT C CTL 1kΩ 100Ω RFG/RRD = 10kΩ to 100kΩ SENSE 1 OUT1P OUT1N 2 OUT2P 3 5VREG OUT2N 1μF CPWM SGND ...

Page 7

... Connect this pin to the GND when it is not to be used pin Rotational speed detection pin This is an open collector output that can detect the rotational speed using the FG output corresponding to the phase changeover. Keep this pin open when it is not to be used. LB11852FV No.A1112-7/12 ...

Page 8

... CTL pin 5VREG EO pin 0V 2. Timing at startup (soft start pin CTL pin SOFT pin LB11852FV The slope is determined by the RC pin constant. CR time constant small Determined by LIM pin voltage Small ← CTL signal (PWMDUTY) → Large Large ← → Small EO pin voltage (V) ...

Page 9

... By changing the pulse width as determined by the CR time constant, the VCTL versus rotational speed slope can be adjusted as shown in the speed control diagram in the previous section. However, since pulses that are determined by the CR time constant are used, the CR variations are output as-is as the speed control error. LB11852FV LB11852 FG Speed ...

Page 10

... × C)/0.01μF … ( × C)/0.015μF … (4) The temperature characteristics of the curve are determined by the temperature characteristics of the capacitor of the RC pin. To minimize the variations in the rotational speed caused by temperature, a capacitor with excellent temperature characteristics must be used. LB11852FV CTL Duty(%) 100% No.A1112-10/12 ...

Page 11

... In the example given : LIM = × Ca × 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 The resistance is 10kΩ between 5VREG and LIM and 62kΩ between LIM and GND. LB11852FV CTL Duty(%) CVO pin voltage (V) 5VREG ...

Page 12

... This catalog provides information as of April, 2008. Specifications and information herein are subject to change without notice. LB11852FV 5VREF A capacitor capable of the smoothing pin voltage is connected here 1 < ...

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