Overview

The LB1872 is a 3-phase brushless motor driver IC

developed for driving the polygon mirror motor used in

laser printers and similar products.

Functions and Features

• Integrates the circuits (speed control and driver circuits)

required for laser printer polygon mirror motor drive in a

single chip.

• Uses a current linear drive technique for minimal motor

noise. Only a small capacitors are required for output

oscillation prevention.

• PLL speed control adopted for high-precision rotation

with excellent jitter characteristics.

• Phase lock detection output with a chattering prevention

function

• Four rotation rates can be set up using a single crystal

oscillator to support 240, 300, 400, and 600 dpi

operation.

• Arbitrary rotation rates can be acquired when an

external clock is used.

• Deceleration function implemented by short-circuit

braking (free running when stopped)

• Built-in FG and error amplifiers

• Full complement of protection circuits, including

thermal protection, low voltage protection, and current

limiter circuits, provided on chip.

Package Dimensions

unit: mm

3147B-DIP28H

Monolithic Digital IC

13098HA(OT) No. 5625-1/11

SANYO: DIP28H

[LB1872]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN

Polygon Mirror Scanner Driver IC

LB1872

Ordering number : EN5625A

Independent IC

Ambient temperature, Ta - °C

With an arbitrarily large heat sink