Ordering number : EN5982
LB1847
Monolithic Digital IC
LB1847
PWM Current Control Type Stepping Motor Driver
Overview
Package Dimensions
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 12 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 highprecision control and low vibrations are required.
unit: mm
3147B-DIP28H
[LB1847]
15
12.7
11.2
R1.7
0.4
8.4
28
1
14
20.0
4.0
4.0
27.0
1.93
1.78
0.6
1.0
SANYO : DIP28H
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
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 Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
11499RM(KI) No. 5982-1/16
LB1847
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Motor supply voltage
V BB
Output peak current
IOPEAK
Output continuous current
IO max
Conditions
Ratings
tW ≤20 µs
Unit
50
V
1.75
A
1.5
A
Logic supply voltage
VCC
7.0
V
Logic input voltage range
VIN
–0.3 to VCC
V
Emitter output voltage
VE
Allowable power dissipation
Pd max
Ta=25°C
With heat sink
1.0
V
3.0
W
20
W
Operating temperature range
Topr
–20 to +85
°C
Storage temperature range
Tstg
–55 to +150
°C
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
VBB
10 to 45
V
Logic supply voltage range
VCC
4.75 to 5.25
V
Reference voltage range
VREF
0.0 to 3.0
V
Allowable power dissipation, Pd max – W
Motor supply voltage range
Pd max – Ta
25
With an arbitrary large heat sink
20.0
20
15
10.4
10
5
IC only
3.0
1.56
0
–20
0
20
40
60
80
100
Ambient temperature, Ta – ˚C
No. 5982-2/16
LB1847
Electrical Characteristics at Ta = 25 °C, VBB = 45V, VCC = 5V, VREF = 1.52V
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
[Output Block]
Output stage supply voltage
Output saturation voltage
Output leak current
Output sustain voltage
IBB ON
2.3
3.5
5.0
mA
IBB OFF
0.5
0.8
1.1
mA
VO(sat)1
IO =+1.0A, sink
1.2
1.6
V
V O(sat)2
IO =+1.5A, sink
1.5
1.9
V
VO(sat)3
IO=–1.0A, source
1.9
2.2
V
V O(sat)4
IO=–1.5A, source
2.2
2.4
V
50
µA
IO(leak)1
VO=V BB, sink
IO (leak)2
VO =0V, source
VSUS
L=15 mH, IO =1.5A, Guaranteed design value
–50
µA
45
V
[Logic Block]
Logic supply voltage
Input voltage
ICC ON
I4=3.2V, I3=3.2V, I2=3.2V, I1=3.2V
19.5
26
36.5
mA
ICC OFF
ENABLE=3.2V
10.5
15
19.5
mA
0.8
V
100
µA
3.2
VIH
V
V IL
Input current
Sensing voltage
Reference current
IIH
V IH=3.2V
IIL
V IL=0.8V
VE
I4=3.2V, I3=3.2V, I2=3.2V, I1=3.2V
0.470
0.50
0.525
V
I4=3.2V, I3=3.2V, I2=3.2V, I1=0.8V
0.445
0.48
0.505
V
I4=3.2V, I3=3.2V, I2=0.8V, I1=3.2V
0.425
0.46
0.485
V
I4=3.2V, I3=3.2V, I2=0.8V, I1=0.8V
0.410
0.43
0.465
V
I4=3.2V, I3=0.8V, I2=3.2V, I1=3.2V
0.385
0.41
0.435
V
I4=3.2V, I3=0.8V, I2=3.2V, I1=0.8V
0.365
0.39
0.415
V
I4=3.2V, I3=0.8V, I2=0.8V, I1=3.2V
0.345
0.37
0.385
V
I4=3.2V, I3=0.8V, I2=0.8V, I1=0.8V
0.325
0.35
0.365
V
I4=0.8V, I3=3.2V, I2=3.2V, I1=3.2V
0.280
0.3
0.30
0.325
V
I4=0.8V, I3=3.2V, I2=3.2V, I1=0.8V
0.240
0.26
0.285
V
I4=0.8V, I3=3.2V, I2=0.8V, I1=3.2V
0.195
0.22
0.235
V
I4=0.8V, I3=3.2V, I2=0.8V, I1=0.8V
0.155
0.17
0.190
0.190
V
I4=0.8V, I3=0.8V, I2=3.2V, I1=3.2V
0.115
0.13
0.145
V
I4=0.8V, I3=0.8V, I2=3.2V, I1=0.8V
0.075
0.09
0.100
V
µA
–10
µA
IREF
VREF=1.5V
–0.5
CR pin current
ICR
CR=1.0V
–4.6
MD pin current
IMD
MD=1.0V, CR=4.0V
–5.0
µA
–10
µA
DECAY pin current Low
IDECL
VDEC=0.8V
DECAY pin current High
IDECH
VDEC=3.2V
Thermal shutdown temperature
Logic ON voltage
–1.0
5
TSD
mA
µA
°C
170
LVSD 1
3.35
3.65
3.95
V
Logic OFF voltage
LVSD2
3.20
3.50
3.80
V
LVSD hysteresis width
∆LVSD
0.065
0.15
0.23
V
No. 5982-3/16
LB1847
Truth table
PHASE
ENABLE
OUTA
H
L
H
L
L
L
L
H
H
OFF
OFF
OUTA
Set current truth table
Set current Iout
Current ratio (%)
IA4
IA3
IA2
IA1
1
1
1
1
11.5/11.5 X V REF/3.04RE=Iout
100
1
1
1
0
11.0/11.5 X V REF/3.04RE=Iout
95.65
1
1
0
1
10.5/11.5 X VREF /3.04RE=Iout
91.30
1
1
0
0
10.0/11.5 X VREF /3.04RE=Iout
86.95
1
0
1
1
9.5/11.5 X VREF/3.04RE=Iout
82.61
1
0
1
0
9.0/11.5 X VREF /3.04RE=Iout
78.26
1
0
0
1
8.5/11.5 X VREF/3.04RE=Iout
73.91
1
0
0
0
8.0/11.5 X V REF/3.04RE=Iout
69.56
0
1
1
1
7.0/11.5 X V REF/3.04RE=Iout
60.87
0
1
1
0
6.0/11.5 X VREF/3.04RE=Iout
52.17
0
1
0
1
5.0/11.5 X V REF/3.04RE=Iout
43.48
0
1
0
0
4.0/11.5 X V REF/3.04RE=Iout
34.78
0
0
1
1
3.0/11.5 X V REF/3.04RE=Iout
26.08
0
0
1
0
2.0/11.5 X VREF/3.04RE=Iout
17.39
* 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
MIX DECAY
L
4V to 1.5V input
voltage setting
Dual-side chopping
CR voltage > MD : dual-side chopping
CR voltage < MD : top-side chopping
No. 5982-4/16
LB1847
Pin function
Pin number
Pin name
Function description
1
MD
2
V REF1
Output set current reference supply pin
13
V REF2
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
6
OUTA
7
OUTA
8
OUTB
9
OUTB
14
VBB
Output stage supply voltage pin
15
GND
Ground pin
27
PHASE1
16
PHASE2
26
ENABLE1
17
ENABLE2
22, 23
IA4, I A3
24, 25
IA2, I A1
Output set current digital input pin
21, 20
IB4, I B3
15-stage voltage setting
19, 18
IB2, I B1
28
VCC
Sets the OFF time for FAST mode and SLOW mode in MIX DECAY
Setting input range: 4V to 1.5V
Output OFF time setting pin for switching operation
Pin for controlling the set current with sensing resistor RE
FAST DECAY: L
Output pin
Output phase selector input pin
Output ON/OFF setting input pin
Logic block supply voltage pin
VCC
PHASE1
ENABLE1
I A1
IA2
IA3
IA4
IB4
IB3
IB2
IB1
ENABLE2
PHASE2
GND
Pin Assignment
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LB1847
14
VBB
13
VREF2
12
CR2
11
E2
10
DECAY2
9
OUTB
8
OUTB
7
OUTA
6
OUTA
5
DECAY1
4
E1
3
CR1
2
VREF1
MD
1
Top view
A11312
No. 5982-5/16
GND
VREF1
E1
E2
Current
circuit
selector
CR1
CR2
circuit
selector
A11311
VREF2
IB4
IA4
ENABLE2
DECAY2
PHASE2
IB3
One-shot
multiblanking
time
Control logic
circuit
VCC
IA3
One-shot
multiblanking
time
OUTB
IB2
OUTB
IA2
Thermal shutdown
circuit
VBB
IB1
Current
Control logic
circuit
OUTA
IA1
ENABLE1
DECAY1
PHASE1
MD
OUTA
LB1847
Block diagram
No. 5982-6/16
LB1847
Sequence table
Phase A
No. IA4
IA3
IA2
Phase B
IA1 ENA1 PHA1
Iout
IB4
IB3
IB2
IB1 ENA1 PHA1
Phase 1-2
Phase W1-2
Phase 2W1-2
Phase 4W1-2
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
Iout
0
1
1
1
1
0
0
100%
0
0
1
0
1
*
1
1
1
1
1
0
0
100
0
0
1
0
0
0
17.39
0%
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
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
* : Iout percentage (%) is the calculated setting value.
No. 5982-7/16
LB1847
Switch timing chart during PWM drive
SLOW DECAY(top-side chopping)
DECAY pin : High
MD pin : Low
E pin
Output pin
tn
RC pin
Output oin
Switching waveform
FAST DECAY
DECAY pin : High
MD pin : Low
A11313
Noise spike
E pin
Output pin
RC pin
Output pin
Switching waveform
A11314
No. 5982-8/16
LB1847
MIX DECAY
Noise spike
tm
E pin
Output pin
tn
RC pin
ton
Output pin
toff
Switching waveform
A11315
ton
toff
tm
tn
: Output ON time
: Output OFF time
: FAST DECAY time in MIX DECAY mode
: 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
No. 5982-9/16
LB1847
SLOW DECAY current path
Regenerative current during top-side transistor switching operation
ON
VBB
Current path at output ON
OFF
Regenerative circuit
when top-side transistor is OFF
OUTA
OUTA
SBD
SBD
ON
Constant
Sensing voltage comparator
Re
A11316
Current path in FAST DECAY mode
VBB
ON
Current path at output ON
OFF
Current path in FAST DECAY mode
OUTA
SBD
SBD
OUTA
ON
Sensing voltage comparator
OFF
Re
A11317
No. 5982-10/16
LB1847
Composite spectrum of set current (1 step normalized to 90°)
Phase B
I OUT
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Sequence No.
0
I OUT
Phase A
No.
θ
Rotation angle
Composite spectrum
0
θ0
0°
100.0
1
θ1
9.87°
101.5
2
θ2
14.6°
103.35
3
θ3
20.0°
101.78
4
θ4
25.5°
101.12
5
θ5
30.96°
101.4
6
θ6
36.38°
102.61
7
θ7
41.63°
104.7
8
θ8
45.0°
104.5
9
θ9
48.37°
104.7
10
θ10
53.62°
102.61
11
θ11
59.04°
101.4
12
θ12
64.5°
101.12
13
θ13
70.0°
101.78
14
θ14
75.4°
103.35
15
θ15
80.13°
101.5
16
θ16
90.0°
100.0
A11318
* Rotation angle and composite spectrum are calculated values.
No. 5982-11/16
LB1847
Set current waveform model
Phase A
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
I OUT
Phase B
I OUT
PHASE1
PHASE2
A11319
No. 5982-12/16
LB1847
Sample Application Circuit
10 µF
5V
IA 1
IA2
IA3
20
19
18
17
16
15
GND
ENABLE1
21
PHASE2
PHASE1
22
ENABLE2
23
IB1
24
IB2
25
IB3
26
IB4
27
IA4
28
VCC
Logic input
OUTA
OUTA
OUTB
OUTB
5
6
7
8
9
L
1.5V to 4.0V
voltage setting
10
11
12
13
VBB
DECAY1
4
VREF2
E1
3
CR2
CR1
2
E2
VREF1
1
DECAY2
MD
LB1847
14
L
SBD
SBD
SBD
42V
SBD
47 µF
0.51Ω
1.5V
0.51Ω
15 kΩ
15 kΩ
470 pF
470 pF
A11320
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. VREF pin
Because the VREF 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 VCC and ground, and VBB and ground should be placed close to the VCC and VBB pins, respectively.
No. 5982-13/16
LB1847
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
Sink side
Source side
PHASE switching
ON delay time
1.9 µs
2.2 µs
(Low -> Hi)
OFF delay time
0.8 µs
1.8 µs
PHASE switching
ON delay time
1.4 µs
1.7 µs
(Hi -> Low)
OFF delay time
0.9 µs
1.35 µs
ENABLE switching
ON delay time
2.15 µs
2.75 µs
OFF delay time
1.2 µs
5.8 µs
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 tn 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.
Equation when logic voltage VCC = 5 V
CR pin voltage E1 = VCC • R/(R1+R2+R) [V]
Noise cancel time tn .=. (R1+R2) • C • 1n {(E1-1.5)/(E1-4.0)}
.
Switching OFF time toff =. –R • C • 1n (1.5/E1) [s]
Internal resistance at CR pin : R1 = 1 kΩ, R2 = 300Ω (typ.)
[s]
*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 µs. The switching time can also be made higher than 100 µs. 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 µs, it is recommended to stay within the CR constant range shown in Figure 2.
Internal configuration at CR pin
VCC line
One-shot multi-blanking
time circuit
R1
CR pin
E1
C:470 pF
1 kΩ
R2
300Ω
R:15 kΩ
A11321
Figure 1
No. 5982-14/16
LB1847
Switching OFF time and CR setting range
(toff time : approx. 8 to 100 µs)
C [pF]
3000
toff time : 30 µs
2000
toff time : 50 µs
toff time : 100 µs
1000
50k
100k
R [Ω]
A11322
Figure 2
No. 5982-15/16
LB1847
Icc – Vcc
40
N
tO
utpu
O
30
F
ut OF
Outp
20
10
0
0
1
2
3
4
IBB – VBB
5
Input logic voltage: IA1,2,3,4
PHA,ENA=VCC
typ.
Output stage supply current, IBB – mA
Logic supply current, ICC – mA
50
5
3
2
Output OFF
1
0
Logic supply voltage, VCC – mV
2.0
1.6
1.2
0.8
0.4
0
0
0.4
0.8
1.2
1.6
Output current, Io – A
20
30
40
60
50
2.0
2.4
Vo(sat) – Io
2.8
Output saturation voltage, Vo(sat) – V
Output saturation voltage, Vo(sat) – V
Sink side
[typ.]
2.4
10
Output stage supply current voltage, VBB – V
Vo(sat) – Io
2.8
N
Output O
4
0
7
6
Input logic voltage: IA1,2,3,4
PHA,ENA=VCC
typ.
Source side
[typ.]
2.4
2.0
1.6
1.2
0.8
0.4
0
0
0.4
0.8
1.2
1.6
2.0
2.4
Output current, Io – A
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.
In the event that any or all SANYO products(including technical data,services) described or
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.
This catalog provides information as of January, 1999. Specifications and information herein are subject to change
without notice.
PS No. 5982-16/16