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Ordering number : ENN7256

Monlithic Digital IC

LB11870

Three-Phase Brushless Motor Driver

for Polygonal Mirror Motors

Overview

The LB11870 is a three-phase brushless motor driver

developed for driving the motors used with the polygonal

mirror in laser printers and plain paper copiers. It can

implement, with a single IC chip, all the circuits required

for polygonal mirror drive, including speed control and

driver functions. The LB11870 can implement motor drive

with minimal power loss due to its use of direct PWM

drive.

Package Dimensions

unit: mm

3265-HSSOP48

[LB11870]

17.8

(6.2)

48

25

(4.9)

鈥?/div>

Three-phase bipolar drive

Direct PWM drive

Includes six high and low side diodes on chip.

Output current control circuit

PLL speed control circuit

Phase lock detection output (with masking function)

Includes current limiter, thermal protection, rotor

constraint protection, and low-voltage protection circuits

on chip.

鈥?Deceleration type switching circuit (free running or

reverse torque)

鈥?PWM oscillator

鈥?Power saving circuit

1

(0.45)

0.65

1.3

0.2

24

(2.2)

0.2

SANYO: HSSOP48 (375 mil)

Specifications

Absolute Maximum Ratings

at Ta = 25擄C

Parameter

Supply voltage

Output current

Allowable power dissipation 1

Allowable power dissipation 2

Operating temperature

Storage temperature

Symbol

V

CC

max

I

O

max

Pd max1

Pd max2

Topr

Tstg

T

鈮?/div>

500 ms

Independent IC

Mounted on a PCB (114.3

脳

76.1

脳

1.6 mm, glass epoxy)

Conditions

Ratings

30

1.8

0.85

1.72

鈥?0 to +80

鈥?5 to +150

Unit

V

A

W

擄C

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft鈥檚

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

80102AS (OT) No. 7256 -1/14

0.1

1.5

2.4max

0.65

Functions and Features

10.5

7.9

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LB11870 Datasheet

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