LB1847
No. 5982-1/16
LB1847
PWM Current Control Type Stepping Motor Driver
Monolithic Digital IC
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 V
REF
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.
Package Dimensions
unit: mm
3147B-DIP28H
Overview
SANYO : DIP28H
[LB1847]
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 (feedthrough current prevention)
Noise canceler
Built-in thermal shutdown circuit
Built-in logic low-voltage OFF circuit
Ordering number : EN5982
11499RM(KI)
SANYO Electric Co., Ltd. Semiconductor Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
1
14
28
15
0.4
0.6
4.0
4.0
27.0
20.0
R1.7
8.4
1.93
1.78
1.0
12.7
11.2
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.
LB1847
No. 5982-2/16
Maximum Ratings
at Ta = 25
C
Specifications
Allowable Operating Ranges
at Ta = 25
C
Parameter
Symbol
Conditions
Ratings
Unit
Motor supply voltage
50
V
Output peak current
1.75
A
Output continuous current
1.5
A
Logic supply voltage
7.0
V
Logic input voltage range
V
Emitter output voltage
1.0
V
Allowable power dissipation
Pd max
Ta=25
C
3.0
W
With heat sink
20
W
Operating temperature range
Topr
C
Storage temperature range
Tstg
C
20 to +85
55 to +150
I
OPEAK
I
O
max
V
BB
t
W
20
s
V
E
V
IN
V
CC
0.3 to V
CC
Parameter
Symbol
Conditions
Ratings
Unit
Motor supply voltage range
10 to 45
V
Logic supply voltage range
4.75 to 5.25
V
Reference voltage range
0.0 to 3.0
V
V
BB
V
CC
V
REF
0
20
20
40
60
80
100
5
10
15
25
20
0
Ambient temperature, Ta C
Allowable power dissipation, Pd
max W
Pd max Ta
IC only
10.4
1.56
20.0
3.0
With an arbitrary large heat sink
LB1847
No. 5982-3/16
Electrical Characteristics
at Ta = 25
C, V
BB
= 45V, V
CC
= 5V, V
REF
= 1.52V
min
typ
max
[Output Block]
Output stage supply voltage
2.3 3.5 5.0
mA
0.5 0.8 1.1
mA
Output saturation voltage
1.2
1.6 V
1.5
1.9 V
1.9
2.2 V
2.2
2.4 V
Output leak current
50
A
50
A
Output sustain voltage
45
V
[Logic Block]
Logic supply voltage
19.5 26 36.5
mA
ENABLE=3.2V
10.5
15
19.5
mA
Input voltage
3.2 V
0.8 V
Input current
100
A
10
A
Sensing voltage
0.470
0.525 V
0.445 0.48
0.505 V
0.425 0.46
0.485 V
0.410
0.43 0.465 V
0.385 0.41
0.435 V
0.365 0.39
0.415 V
0.345 0.37
0.385 V
0.325 0.35
0.365 V
0.280
0.3 0.325 V
0.240
0.26 0.285 V
0.195 0.22
0.235 V
0.155 0.17 0.190
V
0.115 0.13
0.145 V
0.075 0.09
V
Reference current
0.5
A
CR pin current
CR=1.0V
4.6
1.0
mA
MD pin current
MD=1.0V, CR=4.0V
5.0
A
DECAY pin current Low
10
A
DECAY pin current High
5
A
Thermal shutdown temperature
TSD
170
C
Logic ON voltage
3.35 3.65 3.95 V
Logic OFF voltage
3.20
3.50
3.80
V
0.065 0.15 0.23 V
Ratings
Parameter
Symbol
Conditions
Unit
0.50
0.190
0.30
0.100
L
VSD
hysteresis width
I
BB
ON
I
BB
OFF
V
O
(sat)1
V
O
(sat)2
V
O
(sat)3
V
O
(sat)4
I
O
(leak)1
I
O
(leak)2
V
SUS
I
O
=+1.0A, sink
I
O
=+1.5A, sink
I
O
=1.0A, source
I
O
=1.5A, source
V
O
=V
BB
, sink
V
O
=0V, source
L=15 mH, I
O
=1.5A, Guaranteed design value
I
CC ON
I
CC OFF
V
IH
V
IL
I
IH
I
IL
V
IH
=3.2V
V
IL
=0.8V
I
4
=3.2V, I
3
=3.2V, I
2
=3.2V, I
1
=3.2V
I
4
=3.2V, I
3
=3.2V, I
2
=3.2V, I
1
=3.2V
I
4
=3.2V, I
3
=3.2V, I
2
=3.2V, I
1
=0.8V
I
4
=3.2V, I
3
=3.2V, I
2
=0.8V, I
1
=3.2V
I
4
=3.2V, I
3
=3.2V, I
2
=0.8V, I
1
=0.8V
I
4
=3.2V, I
3
=0.8V, I
2
=3.2V, I
1
=3.2V
I
4
=3.2V, I
3
=0.8V, I
2
=3.2V, I
1
=0.8V
I
4
=3.2V, I
3
=0.8V, I
2
=0.8V, I
1
=3.2V
I
4
=3.2V, I
3
=0.8V, I
2
=0.8V, I
1
=0.8V
I
4
=0.8V, I
3
=3.2V, I
2
=3.2V, I
1
=3.2V
I
4
=0.8V, I
3
=3.2V, I
2
=3.2V, I
1
=0.8V
I
4
=0.8V, I
3
=3.2V, I
2
=0.8V, I
1
=3.2V
I
4
=0.8V, I
3
=3.2V, I
2
=0.8V, I
1
=0.8V
I
4
=0.8V, I
3
=0.8V, I
2
=3.2V, I
1
=3.2V
I
4
=0.8V, I
3
=0.8V, I
2
=3.2V, I
1
=0.8V
V
E
I
REF
I
CR
I
DECL
I
MD
L
VSD
1
I
DECH
L
VSD
L
VSD
2
V
REF
=1.5V
V
DEC
=0.8V
V
DEC
=3.2V
LB1847
No. 5982-4/16
PHASE
ENABLE
H
L
H
L
L
L
L
H
H
OFF
OFF
Truth table
Set current truth table
* Current ratio (%) is the calculated set current value.
Current decay switching truth table
Current decay mode
DECAY pin
MD pin
Output chopping
SLOW DECAY
H
L
Top-side chopping
FAST DECAY
L
L
Dual-side chopping
4V to 1.5V input
CR voltage > MD : dual-side chopping
voltage setting
CR voltage < MD : top-side chopping
MIX DECAY
L
OUT
A
OUT
A
Set current Iout
Current ratio (%)
1
1
1
1
100
1
1
1
0
95.65
1
1
0
1
91.30
1
1
0
0
86.95
1
0
1
1
82.61
1
0
1
0
78.26
1
0
0
1
73.91
1
0
0
0
69.56
0
1
1
1
60.87
0
1
1
0
52.17
0
1
0
1
43.48
0
1
0
0
34.78
0
0
1
1
26.08
0
0
1
0
17.39
I
A
4
I
A
3
I
A
2
I
A
1
11.5/11.5 X V
REF
/3.04RE=Iout
11.0/11.5 X V
REF
/3.04RE=Iout
10.5/11.5 X V
REF
/3.04RE=Iout
10.0/11.5 X V
REF
/3.04RE=Iout
9.5/11.5 X V
REF
/3.04RE=Iout
9.0/11.5 X V
REF
/3.04RE=Iout
8.5/11.5 X V
REF
/3.04RE=Iout
2.0/11.5 X V
REF
/3.04RE=Iout
8.0/11.5 X V
REF
/3.04RE=Iout
7.0/11.5 X V
REF
/3.04RE=Iout
6.0/11.5 X V
REF
/3.04RE=Iout
5.0/11.5 X V
REF
/3.04RE=Iout
4.0/11.5 X V
REF
/3.04RE=Iout
3.0/11.5 X V
REF
/3.04RE=Iout
LB1847
No. 5982-5/16
Pin Assignment
Pin function
Pin number
Pin name
Function description
Sets the OFF time for FAST mode and SLOW mode in MIX DECAY
Setting input range: 4V to 1.5V
2
Output set current reference supply pin
13
Setting voltage range: 0V to 3V
3
CR1
12
CR2
4
E1
11
E2
5
DECAY1
SLOW mode/FAST mode selector pin
10
DECAY2
SLOW DECAY: H
FAST DECAY: L
6
7
8
9
14
Output stage supply voltage pin
15
GND
Ground pin
27
PHASE1
16
PHASE2
26
ENABLE1
17
ENABLE2
22, 23
24, 25
Output set current digital input pin
21, 20
15-stage voltage setting
19, 18
28
Logic block supply voltage pin
1
M D
Output OFF time setting pin for switching operation
Pin for controlling the set current with sensing resistor RE
Output pin
Output phase selector input pin
Output ON/OFF setting input pin
V
REF
1
V
REF
2
OUT
A
OUT
A
OUT
B
OUT
B
V
BB
I
A
4, I
A
3
I
A
2, I
A
1
I
B
4, I
B
3
I
B
2, I
B
1
V
CC
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
V
CC
PHASE1
ENABLE1
I A
1
I A
2
I A
3
I A
4
I B
4
I B
3
I B
2
I B
1
ENABLE2
PHASE2
GND
MD
V
REF
1
CR1
E1
DECAY1
OUT
A
OUT
A
OUT
B
OUT
B
DECAY2
E2
CR2
V
REF
2
V
BB
LB1847
A11312
Top view
LB1847
No. 5982-6/16
Block diagram
Control logic
circuit
Thermal shutdown
circuit
Control logic
circuit
Current
selector
circuit
Current
selector
circuit
One-shot
multi-
blanking
time
One-shot
multi-
blanking
time
MD
PHASE1
DECAY1
ENABLE1
I A
1
I A
2
I A
3
I A
4
V
REF
1
GND
V
CC
OUT
B
OUT
B
V
BB
OUT
A
OUT
A
PHASE2
DECAY2
ENABLE2
I B
1
I B
2
I B
3
I B
4
V
REF
2
CR1
E1
E2
CR2
A11311
LB1847
No. 5982-7/16
Sequence table
* : Iout percentage (%) is the calculated setting value.
No. IA4
IA3
IA2
IA1 ENA1 PHA1
Iout
IB4
IB3
IB2
IB1 ENA1 PHA1
Iout
0
1
1
1
1
0
0
100%
0
0
1
0
1
0%
1
1
1
1
1
0
0
100
0
0
1
0
0
0
17.39
2
1
1
1
1
0
0
100
0
0
1
1
0
0
26.08
3
1
1
1
0
0
0
96.65
0
1
0
0
0
0
34.78
4
1
1
0
1
0
0
91.30
0
1
0
1
0
0
43.48
5
1
1
0
0
0
0
86.95
0
1
1
0
0
0
52.17
6
1
0
1
1
0
0
82.61
0
1
1
1
0
0
60.87
7
1
0
1
0
0
0
78.26
1
0
0
0
0
0
69.56
8
1
0
0
1
0
0
73.91
1
0
0
1
0
0
73.91
9
1
0
0
0
0
0
69.56
1
0
1
0
0
0
78.26
10
0
1
1
1
0
0
60.87
1
0
1
1
0
0
82.61
11
0
1
1
0
0
0
52.17
1
1
0
0
0
0
86.95
12
0
1
0
1
0
0
43.48
1
1
0
1
0
0
91.30
13
0
1
0
0
0
0
34.78
1
1
1
0
0
0
96.65
14
0
0
1
1
0
0
26.08
1
1
1
1
0
0
100
15
0
0
1
0
0
0
17.39
1
1
1
1
0
0
100
16
0
0
0
1
1
*
0
1
1
1
1
0
0
100
17
0
0
1
0
0
1
17.39
1
1
1
1
0
0
100
18
0
0
1
1
0
1
26.08
1
1
1
1
0
0
100
19
0
1
0
0
0
1
34.78
1
1
1
0
0
0
95.65
20
0
1
0
1
0
1
43.48
1
1
0
1
0
0
91.30
21
0
1
1
0
0
1
52.17
1
1
0
0
0
0
86.95
22
0
1
1
1
0
1
60.87
1
0
1
1
0
0
82.61
23
1
0
0
0
0
1
69.56
1
0
1
0
0
0
78.26
24
1
0
0
1
0
1
73.91
1
0
0
1
0
0
73.91
25
1
0
1
0
0
1
78.26
1
0
0
0
0
0
69.56
26
1
0
1
1
0
1
82.61
0
1
1
1
0
0
60.87
27
1
1
0
0
0
1
86.95
0
1
1
0
0
0
52.17
28
1
1
0
1
0
1
91.30
0
1
0
1
0
0
43.48
29
1
1
1
0
0
1
95.65
0
1
0
0
0
0
34.78
30
1
1
1
1
0
1
100
0
0
1
1
0
0
26.08
31
1
1
1
1
0
1
100
0
0
1
0
0
0
17.39
Phase A
Phase B
Phase 1-2
Phase W1-2
Phase 2W1-2
Phase 4W1-2
*
LB1847
No. 5982-8/16
Switch timing chart during PWM drive
Output oin
RC pin
Output pin
E pin
Output pin
RC pin
Output pin
E pin
tn
Switching waveform
Switching waveform
A11313
A11314
Noise spike
FAST DECAY
SLOW DECAY(top-side chopping)
DECAY pin : High
DECAY pin : High
MD pin : Low
MD pin : Low
LB1847
No. 5982-9/16
t
on
: Output ON time
t
off
: Output OFF time
t
m
: FAST DECAY time in MIX DECAY mode
t
n
: Noise cancelling time
MIX DECAY logic setting
DECAY pin : L
MD pin : 1.5V to 4.0V voltage setting
CR voltage and MD pin voltage are compared to select dual-side chopping
or top-side chopping.
CR voltage > MD pin voltage: dual-side chopping
CR voltage < MD pin voltage: top-side choppi
tm
tn
Switching waveform
Output pin
RC pin
Output pin
E pin
MIX DECAY
toff
ton
A11315
Noise spike
LB1847
No. 5982-10/16
Current path in FAST DECAY mode
SLOW DECAY current path
Regenerative current during top-side transistor switching operation
A11316
A11317
ON
ON
OUTA
SBD
SBD
Re
OUTA
VBB
OFF
Current path at output ON
Regenerative circuit
ON
ON
OFF
OUTA
SBD
SBD
Re
Sensing voltage comparator
OUTA
VBB
OFF
Current path at output ON
Current path in FAST DECAY mode
when top-side transistor is OFF
Constant
Sensing voltage comparator
LB1847
No. 5982-11/16
Composite spectrum of set current (1 step normalized to 90
)
* Rotation angle and composite spectrum are calculated values.
No.
Rotation angle
Composite spectrum
0
0
0
100.0
1
1
9.87
101.5
2
2
14.6
103.35
3
3
20.0
101.78
4
4
25.5
101.12
5
5
30.96
101.4
6
6
36.38
102.61
7
7
41.63
104.7
8
8
45.0
104.5
9
9
48.37
104.7
10
10
53.62
102.61
11
11
59.04
101.4
12
12
64.5
101.12
13
13
70.0
101.78
14
14
75.4
103.35
15
15
80.13
101.5
16
16
90.0
100.0
Phase B
I OUT
Phase A
I OUT
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Sequence No.
A11318
LB1847
No. 5982-12/16
Set current waveform model
I OUT
I OUT
Phase A
Phase B
PHASE1
PHASE2
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
A11319
LB1847
No. 5982-13/16
Sample Application Circuit
Notes on Usage
1. External diodes
Because this IC uses top-side transistor switching in SLOW DECAY mode and dual-side transistor switching in FAST DECAY
mode, it requires external diodes between the OUT pins and ground, for the regenerative current during switching OFF. Use Schottky
barrier diodes with low VF.
2. V
REF
pin
Because the V
REF
pin serves for input of the set current reference voltage, precautions against noise must be taken. The input voltage
range is 0 to 3.0V.
3. GND pin
The ground circuit for this IC must be designed so as to allow for high-current switching. Blocks where high current flows must use
low-impedance patterns and must be removed from small-signal lines. Especially the ground connection for the sensing resistor RE
at pin E, and the ground connection for the Schottky barrier diodes should be in close proximity to the IC ground.
The capacitors between V
CC
and ground, and V
BB
and ground should be placed close to the V
CC
and V
BB
pins, respectively.
A11320
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
CC
PHASE1
ENABLE1
I A
1
I A
2
I A
3
I A
4
I B
4
I B
3
I B
2
I B
1
ENABLE2
PHASE2
GND
MD
V
REF
1
CR1
E1
DECAY1
OUT
A
OUT
A
OUT
B
OUT
B
DECAY2
E2
CR2
V
REF
2
V
BB
10
F
5V
470 pF
470 pF
47
F
42V
0.51
0.51
15 k
15 k
1.5V
1.5V to 4.0V
SBD
SBD
SBD
SBD
L
L
Logic input
LB1847
voltage setting
LB1847
No. 5982-14/16
Equation when logic voltage V
CC
= 5 V
CR pin voltage E1 = V
CC
R/(R1+R2+R) [V]
Noise cancel time t
n
(R1+R2) C 1n {(E1-1.5)/(E1-4.0)} [s]
Switching OFF time t
off
R C 1n (1.5/E1) [s]
Internal resistance at CR pin : R1 = 1 k
, R2 = 300
(typ.)
*The CR constant setting range in Figure 2 on page 15 is given for reference. It applies to a switching OFF time in the range from 8
to 100
s. The switching time can also be made higher than 100
s. However, a capacitor value of more than several thousand pF
will result in longer noise canceling time, which can cause the output current to become higher than the set current. The longer
switching OFF time results in higher output current ripple, causing a drop in average current and rotation efficiency. When keeping
the switching OFF time within 100
s, it is recommended to stay within the CR constant range shown in Figure 2.
4. Simultaneous ON prevention function
This IC incorporates a circuit to prevent feedthrough current when phase switching. For reference, the output ON and OFF delay
times at PHASE and ENABLE switching are given below.
Reference data * typical value
Internal configuration at CR pin
Figure 1
=
.
.
=
.
.
Sink side
Source side
PHASE switching
ON delay time
1.9
s
2.2
s
(Low ->
Hi)
OFF delay time
0.8
s
1.8
s
PHASE switching
ON delay time
1.4
s
1.7
s
(Hi -> Low)
OFF delay time
0.9
s
1.35
s
ENABLE switching
ON delay time
2.15
s
2.75
s
OFF delay time
1.2
s
5.8
s
5. Noise canceler
This IC has a noise canceling function to prevent malfunction due to noise spikes generated when switching ON. The noise cancel
time t
n
is determined by internal resistance of the CR pin and the constant of the externally connected CR components. The constant
also determines the switching OFF time.
Figure 1 shows the internal configuration at the CR pin, and Figure 2 the CR pin constant setting range.
A11321
R:15 k
C:470 pF
300
CR pin
E1
One-shot multi-blanking
time circuit
R1
R2
1 k
VCC line
LB1847
No. 5982-15/16
Switching OFF time and CR setting range
(t
off
time : approx. 8 to 100
s)
Figure 2
50k
100k
R [
]
1000
2000
3000
C [pF]
toff time : 30
s
toff time : 50
s
toff time : 100
s
A11322
LB1847
No. 5982-16/16
This catalog provides information as of January, 1999. Specifications and information herein are subject to change
without notice.
PS
7
50
40
30
20
10
0
0
1
2
3
4
5
6
Logic supply voltage, VCC mV
Logic supply current, I
CC
mA
Input logic voltage: IA1,2,3,4
PHA,ENA=VCC
typ.
Output ON
Output OFF
Icc Vcc
60
5
4
3
2
1
0
0
10
20
30
40
50
Output stage supply current voltage, V
BB
V
Output stage supply current, I
BB
mA
Input logic voltage: I
A
1,2,3,4
PHA,ENA=VCC
typ.
Output ON
Output OFF
I
BB
V
BB
Output current, Io A
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
1.2
1.6
0.8
0.4
0
2.0
2.4
Output saturation voltage, V
o
(sat)
V
Vo
(sat)
Io
Source side
[typ.]
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
I n t h e e v e n t t h a t a n y o r a l l S A N Y O p r o d u c t s ( i n c l u d i n g t e c h n i c a l d a t a , s e r v i c e s ) d e s c r i b e d o r
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
1.2
1.6
0.8
0.4
0
2.0
2.4
Output saturation voltage, V
o
(sat)
V
Vo
(sat)
Io
Sink side
[typ.]
Output current, Io A
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