LB1847 Datasheet, PDF (1/15 Pages) Sanyo Semicon Device – PWM Current Control Type Stepping Motor Driver

Ordering number : EN5982A
LB1847
Monolithic Digital IC
PWM Current Control Type
Stepping Motor Driver
http://onsemi.com
Overview
The LB1847 is a driver IC for stepping motors with PWM current control bipolar drive (fixed OFF time). A special
feature of this IC is that VREF voltage is constant while the current can be set in 15 steps, allowing drive of motors
ranging from 1-2 phase exciter types to 4W 1-2 phase exciter types. The current decay pattern can also be selected
(SLOW DECAY, FAST DECAY, MIX DECAY) to increase the decay of regenerative current at chopping OFF,
thereby improving response characteristics. This is especially useful for carriage and paper feed stepping motors in
printers and similar applications where high-precision control and low vibrations are required.
Features
• PWM current control (fixed OFF time)
• Load current digital selector (1-2, W1-2, 2W1-2, 4W1-2 phase exciter drive possible)
• Selectable current decay pattern (SLOW DECAY, FAST DECAY, MIX DECAY)
• Simultaneous ON prevention function (feed-through current prevention)
• Noise canceler
• Built-in thermal shutdown circuit
• Built-in logic low-voltage OFF circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Motor supply voltage
Output peek current
Output continuous current
Logic supply voltage
Logic input voltage range
Emitter output voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VBB
IO peak
IO max
VCC
VIN
VE
Pd max
Topr
Tstg
tW = 20μs
Conditions
Independent IC
With infinitely large heat sink
Ratings
Unit
50
V
1.75
A
1.5
A
7.0
A
-0.3 to VCC
V
1.0
V
3.0
W
20
W
-20 to +85
°C
-55 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
June, 2013
21809 MS / 11499RM(KI) No.5982-1/15