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.

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.

71107 TI PC 20070621-S00004/41807 TI PC B8-9144 No.A0081-1/14

LB11873

Overview

The LB11873 is a 3-phase brushless motor driver developed for driving the polygonal mirror motor used in plain-paper

copiers and similar products. This IC can implement the circuits required for polygonal mirror motor drive (speed control

and driver circuits) in a single chip.

The LB11873 implements low-noise/low-vibration PWM drive by changing the current at phase switching gradually to

reduce motor noise.

Functions

• Three-phase bipolar drive (quiet direct PWM)

• PLL speed control circuit

• Hall sensor FG support

• Dedicated external clock

• Brake mode switching circuit (free running and reverse braking)

• Phase lock detection output (with masking function)

• Built-in current limiter, constraint protection, undervoltage protection, thermal protection, and CLK line disconnection

protection circuits

• Input pins support 3V system microcontrollers

Specifications

Absolute Maximum Ratings at Ta = 25

°C

Parameter

Symbol

Conditions

Ratings

Unit

Supply voltage

VCC max

30

V

Output current

IO max

T

≤ 500ms

1.8

A

Allowable power dissipation 1

Pd max1

Independent IC

0.9

W

Allowable power dissipation 2

Pd max2

When mounted on a circuit board *1

2.1

W

*1 Specified circuit board : 114.3

Continued on next page.

Monolithic Digital IC

For Polygonal Mirror Motors

Three-Phase Brushless Motor Driver

Ordering number : ENA0081B