LB11870 Datasheet, PDF (1/14 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for Polygonal Mirror Motors

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.
Functions and Features
• 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.
• Deceleration type switching circuit (free running or
reverse torque)
• PWM oscillator
• Power saving circuit
Package Dimensions
unit: mm
3265-HSSOP48
[LB11870]
17.8
(6.2)
48
25
1
24
0.65
0.2
0.2
(0.45)
1.3
1.5
SANYO: HSSOP48 (375 mil)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output current
Allowable power dissipation 1
Allowable power dissipation 2
Operating temperature
Storage temperature
Symbol
Conditions
Ratings
Unit
V_CC max
I_O max
Pd max1
T ≤ 500 ms
Independent IC
30
V
1.8
A
0.85
W
Pd max2 Mounted on a PCB (114.3 × 76.1 × 1.6 mm, glass epoxy)
1.72
W
Topr
–20 to +80
°C
Tstg
–55 to +150
°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’s
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