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PDF LB1847 Data sheet ( Hoja de datos )
| Número de pieza | LB1847 | |
| Descripción | Stepping Motor Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LB1847 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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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
50
1.75
1.5
7.0
-0.3 to VCC
1.0
3.0
20
-20 to +85
-55 to +150
Unit
V
A
A
A
V
V
W
W
°C
°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
1 page  
Pin Function
Pin No.
Pin name
1 MD
2 VREF1
13 VREF2
3 CR1
12 CR2
4 E1
11 E2
5 DECAY1
10 DECAY2
6
7
8
9
14
15
27
16
26
17
22,23
24,25
21,20
19,18
28
OUTA
OUTA
OUTB
OUTB
VBB
GND
PHASE1
PHASE2
ENABLE1
ENABLE2
IA4,IA3
IA2,IA1
IB4,IB3
IB2,IB1
VCC
LB1847
Function
Sets the OFF time for FAST mode and SLOW mode in MIX DECAY.
Setting input range: 4V to 1.5V.
Output set current reference supply pin.
Setting voltage range: 0V to 3V.
Output OFF time setting pin for switching operation.
Pin for controlling the set current with sensing resistor RE.
SLOW mode/FAST mode selector pin.
DECAY2 SLOW DECAY: H
FAST DECAY: L
Output pin.
Output stage supply voltage pin.
Ground pin.
Output phase selector input pin
Output ON/OFF setting input pin.
Output set current digital input pin.
15-stage voltage setting.
Logic block supply voltage pin
Truth Table
PHASE ENABLE
HL
LL
−H
OUTA
H
L
OFF
OUTA
L
H
OFF
Set Current Truth Table
IA4 IA3 IA2 IA1
Set current Iout
1 1 1 1 11.5/11.5 × VREF/3.04RE = Iout
1 1 1 0 11.0/11.5 × VREF/3.04RE = Iout
1 1 0 1 10.5/11.5 × VREF/3.04RE = Iout
1 1 0 0 10.0/11.5 × VREF/3.04RE = Iout
1 0 1 1 9.5/11.5 × VREF/3.04RE = Iout
1 0 1 0 9.0/11.5 × VREF/3.04RE = Iout
1 0 0 1 8.5/11.5 × VREF/3.04RE = Iout
1 0 0 0 8.0/11.5 × VREF/3.04RE = Iout
0 1 1 1 7.0/11.5 × VREF/3.04RE = Iout
0 1 1 0 6.0/11.5 × VREF/3.04RE = Iout
0 1 0 1 5.0/11.5 × VREF/3.04RE = Iout
0 1 0 0 4.0/11.5 × VREF/3.04RE = Iout
0 0 1 1 3.0/11.5 × VREF/3.04RE = Iout
0 0 1 0 2.0/11.5 × VREF/3.04RE = Iout
* Current ratio (%) is the calculated set current value.
Current ratio
100
95.65
91.30
86.95
82.61
78.26
73.91
69.56
60.87
52.17
43.48
34.78
26.08
17.39
Current Decay Switching Truth Table
Current decay mode
DECAY pin
MD pin
SLOW DECAY
H
L
FAST DECAY
L
L
MIX DECAY
4V to 1.5V input
L
voltage setting
Output chopping
Upper-side chopping
Dual-side chopping
CR voltage > MD: dual-side chopping
CR voltage < MD: upper-side chopping
No.5982-5/15
5 Page 
Set Current Waveform Model
LB1847
Phase A
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Phase B
IOUT
IOUT
PHASE1
PHASE2
No.5982-11/15
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LB1847.PDF ] | |
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