Ordering number : EN5982A
LB1847
Monolithic Digital IC
PWM Current Control Type
http://onsemi.com
Stepping Motor Driver
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
Symbol
Motor supply voltage
VBB
Output peek current
IO peak
Output continuous current
IO max
Logic supply voltage
VCC
Logic input voltage range
VIN
Emitter output voltage
VE
Allowable power dissipation
Pd max
Conditions
Ratings
Unit
50
tW = 20μs
V
1.75
A
1.5
A
7.0
A
-0.3 to VCC
V
1.0
V
Independent IC
3.0
W
With infinitely large heat sink
20
W
Operating temperature
Topr
-20 to +85
°C
Storage temperature
Tstg
-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
LB1847
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Motor supply voltage range
VBB
10 to 45
V
Logic supply voltage
VCC
4.75 to 5.25
V
Reference voltage range
VREF
0.0 to 3.0
V
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
IBB ON
IBB OFF
Output saturation voltage
2.3
3.5
5.0
mA
0.5
0.8
1.1
mA
VO(sat)1
IO = +1.0A, sink
1.2
1.6
V
VO(sat)2
IO = +1.5A, sink
1.5
1.9
V
VO(sat)3
IO = -1.0A, source
1.9
2.2
V
VO(sat)4
IO = -1.5A, source
2.2
2.4
V
Output leak current
IO(leak)1
VO = VBB, sink
50
μA
IO(leak)2
VO = 0V, source
Output sustain voltage
VSUS
L = 15mH, IO = 1.5A, Guaranteed design value *
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
-50
μA
45
V
Logic Block
Logic supply voltage
Input voltage
VIH
3.2
V
VIL
Input current
Sensing voltage
0.8
100
V
μA
IIH
VIH = 3.2V
IIL
VIL = 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
0.30
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
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
Reference current
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
DECAY pin current Low
IDECL
VDEC = 0.8V
-10
DECAY pin current High
IDECH
VDEC = 3.2V
Thermal shutdown temperature
TSD
μA
-1.0
mA
μA
μA
5
μA
°C
170
Logic ON voltage
LVSD1
3.35
3.65
3.95
V
Logic OFF voltage
LVSD2
3.20
3.50
3.80
V
LVSD hysteresis width
ΔLVSD
0.065
0.15
0.23
V
No.5982-2/15
LB1847
Package Dimensions
unit : mm (typ)
3147C
15
12.7
11.2
R1.7
0.4
8.4
28
1
14
20.0
4.0
4.0
26.75
(1.81)
0.6
1.78
1.0
SANYO : DIP28H(500mil)
Pd max -- Ta
Allowable power dissipation, Pd max -- W
25
With infinitely large heat sink
20
15
10.4
10
5
3
Independent IC
1.56
0
-20
0
20
40
60
8085
100
Ambient temperature, Ta -- °C
VCC
PHASE1
ENABLE1
IA1
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
MD
VREF1
CR1
E1
DECAY1
OUYA
OUYA
OUYB
OUYB
DECAY2
E2
CR2
VREF2
VBB
LB1847
Top view
No.5982-3/15
GND
VREF1
E1
E2
Current
selector
circuit
CR1
CR2
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
selector
circuit
Control logic
circuit
OUTA
IA1
ENABLE1
DECAY1
PHASE1
MD
OUTA
LB1847
Block Diagram
No.5982-4/15
LB1847
Pin Function
Pin No.
Pin name
1
Function
MD
Sets the OFF time for FAST mode and SLOW mode in MIX DECAY.
Setting input range: 4V to 1.5V.
VREF1
VREF2
Output set current reference supply pin.
13
2
3
CR1
Output OFF time setting pin for switching operation.
12
CR2
4
E1
11
E2
Setting voltage range: 0V to 3V.
Pin for controlling the set current with sensing resistor RE.
5
DECAY1
SLOW mode/FAST mode selector pin.
10
DECAY2
DECAY2 SLOW DECAY: H
6
OUTA
OUTA
FAST DECAY: L
7
8
Output pin.
9
OUTB
OUTB
14
VBB
15
GND
Ground pin.
27
PHASE1
Output phase selector input pin
16
PHASE2
26
ENABLE1
17
ENABLE2
Output stage supply voltage pin.
Output ON/OFF setting input pin.
22,23
IA4,IA3
Output set current digital input pin.
24,25
IA2,IA1
15-stage voltage setting.
21,20
IB4,IB3
19,18
IB2,IB1
28
VCC
Logic block supply voltage pin
Truth Table
PHASE
ENABLE
OUTA
OUTA
H
L
H
L
L
L
L
H
−
H
OFF
OFF
Set Current Truth Table
IA4
IA3
IA2
IA1
Set current Iout
Current ratio
1
1
1
1
11.5/11.5 × VREF/3.04RE = Iout
100
1
1
1
0
11.0/11.5 × VREF/3.04RE = Iout
95.65
1
1
0
1
10.5/11.5 × VREF/3.04RE = Iout
91.30
1
1
0
0
10.0/11.5 × VREF/3.04RE = Iout
86.95
1
0
1
1
9.5/11.5 × VREF/3.04RE = Iout
82.61
1
0
1
0
9.0/11.5 × VREF/3.04RE = Iout
78.26
1
0
0
1
8.5/11.5 × VREF/3.04RE = Iout
73.91
1
0
0
0
8.0/11.5 × VREF/3.04RE = Iout
69.56
0
1
1
1
7.0/11.5 × VREF/3.04RE = Iout
60.87
0
1
1
0
6.0/11.5 × VREF/3.04RE = Iout
52.17
0
1
0
1
5.0/11.5 × VREF/3.04RE = Iout
43.48
0
1
0
0
4.0/11.5 × VREF/3.04RE = Iout
34.78
0
0
1
1
3.0/11.5 × VREF/3.04RE = Iout
26.08
0
0
1
0
2.0/11.5 × 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
Upper-side chopping
FAST DECAY
L
L
Dual-side chopping
MIX DECAY
L
4V to 1.5V input
voltage setting
CR voltage > MD: dual-side chopping
CR voltage < MD: upper-side chopping
No.5982-5/15
LB1847
Sequence Table
Phase A
No.
IA4
IA3
IA2
Phase B
IA1 ENA1 PHA1
Iout
IB4
IB3
IB2
IB1 ENA2 PHA2
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
95.65
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
95.65
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 1-2
{
Phase W1-2 Phase 2W1-2 Phase 4W1-2
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
* Don’t care
Note: Iout percentage (%) is the calculated setting value.
No.5982-6/15
LB1847
Switch Timing Chart During PWM Drive
SLOW DECAY (upper-side chopping)
DECAY pin: High
MD pin: Low
E pin
Output pin
tn
RC pin
Output pin
Switching waveform
FAST DECAY
DECAY pin: Low
MD pin: Low
Noise spike
E pin
Output pin
RC pin
Output pin
Switching waveform
No.5982-7/15
LB1847
MIX DECAY
Noise spike
tm
E pin
Output pin
tn
RC pin
ton
Output pin
toff
Switching waveform
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 upper-side chopping.
CR voltage > MD pin voltage: dual-side chopping
CR voltage < MD pin voltage: upper-side chopping
No.5982-8/15
LB1847
SLOW DECAY Current Path
Regenerative current during upper-side transistor switching operation
ON
VBB
Current path at output ON
OFF
Regenerative current
at upper-side transistor OFF
OUTA
OUTA
SBD
SBD
ON
constant
Sensing voltage comparator
Re
FAST DECAY Current Path
VBB
ON
Current path at output ON
OFF
Current path at FAST DECAY
OUTA
SBD
SBD
OUTA
ON
Sensing voltage comparator
OFF
Re
No.5982-9/15
LB1847
Composite Spectrum of Set Current (1 step normalized to 90°)
Phase B
IOUT
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Sequence No.
0
Phase A
No.
θ
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
IOUT
Rotation angle Composite spectrum
* Rotation angle and composite spectrum are calculated values.
No.5982-10/15
LB1847
Set Current Waveform Model
Phase A
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
IOUT
Phase B
IOUT
PHASE1
PHASE2
No.5982-11/15
LB1847
Sample Application Circuit
10μF
5V
IA1
IA2
IA3
20
19
18
17
15
MD
VREF1
CR1
E1
DECAY1
OUYA
OUYA
OUYB
OUYB
DECAY2
E2
CR2
VREF2
VBB
LB1847
16
GND
ENABLE1
21
PHASE2
PHASE1
22
ENABLE2
23
IB1
24
IB2
25
IB3
26
IB4
27
IA4
28
VCC
Logic input
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1.5V to 4.0V
voltage setting
L
L
SBD
SBD
SBD
SBD
42V
47μF
1.5V
0.51Ω
15kΩ
0.51Ω
15kΩ
470pF
470pF
Notes on Usage
1. External diodes
Because this IC uses upper-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.5982-12/15
LB1847
4. Simultaneous ON prevention function
This IC incorporates a circuit to prevent feed-through 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
2.2μs
PHASE switching
ON delay time
1.9μs
(Low → Hi)
OFF deley time
0.8μs
1.8μs
PHASE switching
ON delay time
1.4μs
1.7μs
(Hi → Low)
OFF deley time
0.9μs
1.35μs
ENABLE switching
ON delay time
2.15μs
2.75μs
OFF deley time
1.2μs
5.8μs
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 = 5V
CR pin voltage E1 = VCC × R / (R1 + R2 + R) [V]
Noise cancel time tn ≈ (R1 + R2)× C × 1n {(E1 − 1.5) / (E1 − 4.0)} [s]
Switching OFF time toff ≈ –R × C × 1n (1.5 / E1) [s]
Internal resistance at CR pin : R1 = 1kΩ, R2 = 300Ω (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 100μs. The switching time can also be made higher than 100 ms. 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 ms, 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
1kΩ
R2
CR pin
E1
C:470pF
300Ω
R:15kΩ
Figure 1
No.5982-13/15
LB1847
Switching OFF time and CR setting range
(toff time : approx. 8 to 100μs)
C [pF]
3000
toff time : 30μs
2000
toff time : 50μs
toff time : 100μs
1000
50k
100k
R [Ω]
No.5982-14/15
LB1847
ICC -- VCC
Input logic voltage: IA1,2,3,4
PHA,ENA = VCC
typ.
40
N
ut O
p
Out
30
FF
ut O
Outp
20
10
0
0
1
2
3
IBB -- VBB
5
Output stage supply current, IBB -- mA
Logic supply current, ICC -- mA
50
4
5
6
Input logic voltage: IA1,2,3,4
PHA,ENA = VCC
typ.
3
2
Output OFF
1
0
7
N
Output O
4
0
VO(sat) -- IO
Sink side
[typ.]
2.4
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
50
60
VO(sat) -- IO
2.8
2.0
2.4
Output saturation voltage, VO(sat) -- V
Output saturation voltage, VO(sat) -- V
2.8
10
Output stage supply current voltage, VBB -- V
Logic supply voltage, VCC -- mV
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
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PS No.5982-15/15