Overview
The LB1870 and LB1870M are three-phase brushless
motor driver ICs that are optimal for LBP and LBF
polygon mirror motor drive.
Functions and Features
Single-chip implementation of all circuits required for
LBP polygon mirror motor drive (speed control and
driver circuits)
Low motor drive noise level due to the current linear
drive scheme implemented by these ICs. Also, small
capacitors suffice for motor output oscillation
suppression, with certain motors not requiring these
capacitors at all.
Extremely high rotational precision provided by PLL
speed control.
Built-in phase lock detector output
Four motor speed modes set by switching the clock
divider provided under internal clock/crystal oscillator
operation. This supports 240, 300, 400 and 480 dpi.
Use of an external clock allows arbitrary motor speeds.
Built-in FG and integrating amplifiers
Full set of built-in protection circuits, including current
limiter, undervoltage protection, and thermal protection
circuits.
41807 TI PC/98HA (OT)/91494TH (OT) B8-1284, 1285/N2092TS A8-9121, 9122 No. 4356-1/11
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
30
V
Maximum output current
IO max
T < 0.1 s
1.0
A
Allowable power dissipation (1)
Pd max1-1
Independent IC (DIP28HS)
3.0
W
Pd max1-2
Independent IC (MFP36SLF)
0.95
W
Allowable power dissipation (2)
Pd max2
With an arbitrarily large heat sink
20
W
Operating temperature
Topr
–20 to +80
°C
Storage temperature
Tstg
–55 to +150
°C
Ordering number : EN4356C
SANYO Semiconductors
DATA SHEET
LB1870
LB1870M
Monolithic Digital IC
Three-Phase Brushless Motor
Driver IC
Package Dimensions
unit : mm (typ)
3147C [LB1870]
SANYO : DIP28H(500mil)
1
14
28
15
0.4
0.6
4.0
26.75
20.0
R1.7
8.4
(1.81)
1.78
1.0
12.7
11.2
unit : mm (typ)
3280A [LB1870M]
SANYO : MFP36SLF(375mil)
15.2
10.5
7.9
0.65
0.1
2.45MAX
(2.25)
1
18
19
36
0.35
0.8
(0.8)
0.25
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