Ordering number : EN7115
LB1946
Monolithic Digital IC
PWM Current Control Stepping Motor Driver
Overview
The LB1946 is stepping motor drive IC that implements PWM current control bipolar drive with a fixed off time. This IC
features 15-current setting levels using a fixed VREF voltage and supports for microstepping drive from 1-2 phase
excitation to 4W1-2 phase excitation drive. This device is optimal for driving stepping motors such as those used for
carriage drive and paper feed in printers.
Applications
• PWM current control stepping motor drivers
Features
• PWM current control with a fixed off time
• Logic input serial-parallel converter (allows 1-2, W1-2, 2W1-2, and 4W1-2 phase excitation drive)
• Current attenuation switching function (with slow decay, fast decay, and mixed decay modes)
• Built-in upper and lower side output diodes
• Simultaneous on state prevention function (through current prevention)
• Noise canceller function
• Thermal shutdown circuit
• Shutoff on low logic system voltage circuit
• Low-power mode control pin
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Motor supply voltage
VBB
Peak output current
IO PEAK
Maximum continuous output current
Conditions
tw≤20µs
Ratings
Unit
50
V
1.75
A
IO max
1.5
A
Logic system supply voltage
VCC
7.0
V
Logic input voltage range
VIN
-0.3 to VCC
V
Emitter output voltage
VE
1.0
V
Operating temperature
Topr
-20 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
3.0
W
Allowable power dissipation (IC internal)
Pd max
Ta=25°C, independent IC
Any and all SANYO Semiconductor 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 Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor 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 Semiconductor
products described or contained herein.
11707 SY IM B8-5416 No.7115-1/16
LB1946
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Motor supply voltage
VBB
10 to 45
V
Logic supply voltage
VCC
4.5 to 5.5
V
Reference voltage
VREF
0.0 to 3.0
V
Electrical Characteristics at Ta = 25°C, VCC = 5V, VBB = 45V, VRES = 1.52V
Parameter
Symbol
Ratings
Conditions
min
typ
unit
max
Output Block
Output stage supply current
IBB ON
IBB OFF
1.6
2.4
3.5
mA
1.3
1.9
2.5
mA
Output saturation voltage 1
VOsat1
IO=+1.0A (sink)
1.2
1.6
V
Output saturation voltage 2
VOsat2
IO =+1.5 A (sink)
1.5
1.9
V
Output saturation voltage 3
VOsat3
IO=-1.0 A (source)
1.9
2.2
V
Output saturation voltage 4
VOsat4
IO=-1.5 A (source)
2.2
2.4
V
50
µA
Output leakage current
IO1 (leak)
IO2 (leak)
Output sustain voltage
VO sus
VO=VBB (sink)
VO=0V (source)
L=15mH IO=1.5A *
-50
µA
45
V
Logic Block
Logic system supply current
ICC ON
D0=1,D1=1,D2=1,D3=1
When these data values are set
Input voltage
ICC OFF1
D0=0,D1=0,D2=0,D3=0
ICC OFF2
ST=LOW
VIH
25.5
37
48.5
mA
18
26
34
mA
0.01
0.05
0.1
mA
0.8
V
35
µA
2
V
VIL
Input current
Sense voltages
IIH
VIH=2V
IIL
VIL=0.8V
VE
D0=1,D1=1,D2=1,D3=1
µA
6
0.470
0.50
0.525
V
D0=1,D1=1,D2=1,D3=0
0.445
0.48
0.505
V
D0=1,D1=1,D2=0,D3=1
0.425
0.46
0.485
V
D0=1,D1=1,D2=0,D3=0
0.410
0.43
0.465
V
D0=1,D1=0,D2=1,D3=1
0.385
0.41
0.435
V
D0=1,D1=0,D2=1,D3=0
0.365
0.39
0.415
V
D0=1,D1=0,D2=0,D3=1
0.345
0.37
0.385
V
D0=1,D1=0,D2=0,D3=0
0.325
0.35
0.365
V
D0=0,D1=1,D2=1,D3=1
0.280
0.30
0.325
V
D0=0,D1=1,D2=1,D3=0
0.240
0.26
0.285
V
D0=0,D1=1,D2=0,D3=1
0.195
0.22
0.235
V
D0=0,D1=1,D2=0,D3=0
0.155
0.17
0.190
V
D0=0,D1=0,D2=1,D3=1
0.115
0.13
0.145
V
D0=0,D1=0,D2=1,D3=0
0.075
0.09
0.100
V
-1.25
-0.9
When these data values are set
Reference current
IREF
VREF=1.5V
-0.5
CR pin current
ICR
CR=1.0V
-1.7
MD pin current
IMD
MD=1.0V, CR=4.0V
-5.0
µA
mA
µA
Logic system on voltage
VLSDON
2.6
2.8
3.0
V
Logic system off voltage
VLSDOFF
2.45
2.65
2.85
V
VLHIS
0.03
0.15
0.35
V
LVSD hysteresis
Thermal shutdown temperature
Ts
170
°C
*Design guaranteed value
No.7115-2/16
LB1946
AC Electrical Characteristics at VCC = 5V
Parameter
Symbol
Ratings
Conditions
min
Clock frequency
fclk
Data setup time
tDS
Data hold time
typ
200
VCC=5.0V
unit
max
550
kHz
VCC=5.0V
0.9
2.5
µs
µs
tDH
VCC=5.0V
0.9
2.5
Minimum clock high-level pulse width
tSCH
VCC=5.0V
0.9
2.5
µs
Minimum clock low-level pulse width
tSCL
VCC=5.0V
0.9
2.5
µs
tlat
VCC=5.0V
0.9
2.5
µs
tlatw
VCC=5.0V
1.9
5.0
µs
SET pin stipulated time
SET pin signal pulse width
fclk
tSCH tSCL
CLK
tDS tDH
DATA
D4
D5
D11
D10
D6
tlat
SET
tlatw
VCC=3.3V Specification
Absolute Maximum Ratings
Parameter
Symbol
Emitter output voltage
Conditions
Ratings
Unit
VE
0.5
V
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Motor system supply voltage
Conditions
Ratings
Unit
VBB
10 to 45
V
Logic system supply voltage
VCC
3.0 to 3.6
V
Reference voltage
VREF
0.0 to 1.0
V
Electrical Characteristics at Ta = 25°C, VCC = 3.3V, VBB = 45V, VREF = 1.0V
Parameter
Symbol
Ratings
Conditions
min
typ
unit
max
Output Block
Output stage supply current
IBB ON
1.6
2.4
3.5
mA
IBB OFF
1.3
1.9
2.5
mA
Output saturation voltage 1
VOsat1
IO=+1.0A (sink)
1.3
1.7
V
Output saturation voltage 2
VOsat2
IO=+1.5 A (sink)
1.6
2.0
V
Output saturation voltage 3
VOsat3
IO=-1.0 A (source)
1.9
2.2
V
Output saturation voltage 4
VOsat4
IO=-1.5 A (source)
2.2
2.4
V
50
µA
Output leakage current
Output sustain voltage
*Design guaranteed value
IO1 (leak)
VO=VBB (sink)
IO2 (leak)
VO=0V (source)
VO sus
L=15mH IO=-1.5A *
-50
45
µA
V
Continued on next page.
No.7115-3/16
LB1946
Continued from preceding page.
Parameter
Symbol
Ratings
Conditions
min
typ
unit
max
Logic Block
Logic system supply current
ICC ON
D0=1,D1=1,D2=1,D3=1
When these data values are set
Input voltage
ICC OFF1
D0=0,D1=0,D2=0,D3=0
ICC OFF2
ST=0.8V
23.5
34
44.5
mA
16
23
30
mA
0.005
0.03
0.1
mA
0.8
V
35
µA
VIH
2
V
VIL
Input current
Sense voltages
IIH
VIH=2V
IIL
VIL=0.8V
VE
D0=1,D1=1,D2=1,D3=1
0.303
0.330
0.356
V
D0=1,D1=1,D2=1,D3=0
0.290
0.315
0.341
V
D0=1,D1=1,D2=0,D3=1
0.276
0.300
0.324
V
D0=1,D1=1,D2=0,D3=0
0.263
0.286
0.309
V
D0=1,D1=0,D2=1,D3=1
0.250
0.272
0.294
V
D0=1,D1=0,D2=1,D3=0
0.236
0.257
0.278
V
D0=1,D1=0,D2=0,D3=1
0.223
0.243
0.263
V
D0=1,D1=0,D2=0,D3=0
0.209
0.228
0.247
V
D0=0,D1=1,D2=1,D3=1
0.183
0.200
0.217
V
D0=0,D1=1,D2=1,D3=0
0.155
0.170
0.185
V
D0=0,D1=1,D2=0,D3=1
0.128
0.143
0.158
V
D0=0,D1=1,D2=0,D3=0
0.102
0.114
0.126
V
D0=0,D1=0,D2=1,D3=1
0.074
0.085
0.096
V
D0=0,D1=0,D2=1,D3=0
0.047
0.057
0.067
When these data values are set
Reference current
µA
6
IREF
VREF=1.5V
CR pin current
ICR
CR=1.0V
MD pin current
IMD
MD=1.0V, CR=4.0V
-0.91
V
µA
-0.5
-0.7
-0.49
mA
µA
-5.0
Logic system on voltage
VLSDON
2.6
2.8
3.0
V
Logic system off voltage
VLSDOFF
2.45
2.65
2.85
V
VLHIS
0.03
0.15
0.35
LVSD hysteresis
Thermal shutdown temperature
Ts
V
°C
170
AC Electrical Characteristics at VCC = 3.3V
Parameter
Symbol
Ratings
Conditions
min
Clock frequency
typ
unit
max
fclk
VCC=3.3V
Data setup time
tDS
VCC=3.3V
0.9
2.5
µs
Data hold time
tDH
VCC=3.3V
0.9
2.5
µs
Minimum clock high-level pulse width
tSCH
VCC=3.3V
0.9
2.5
µs
Minimum clock low-level pulse width
tSCL
VCC=3.3V
0.9
2.5
µs
tlat
VCC=3.3V
0.9
2.5
µs
tlatw
VCC=3.3V
1.9
5.0
µs
SET pin stipulated time
SET pin signal pulse width
200
550
kHz
No.7115-4/16
LB1946
fclk
tSCH tSCL
CLK
tDS tDH
DATA
D4
D5
D10
D6
D11
tlat
SET
tlatw
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
4.0
Independent IC
3.0
2.0
1.0
0
--20
0
20
40
60
Ambient temperature, Ta - °C
80
100
ILB01479
No.7115-5/16
LB1946
Block Diagram
VCC
VREF2
ST
+ -
Current selection
circuit
Control logic circuit
One-shot
multi-vibrator
blanking time
CR2
OUTBE2
OUTB
SET
Serial-parallel
conversion
circuit
Thermal
shutdown
circuit
VBB
DATA
CLK
OUTAE1
OUTA
One-shot
multi-vibrator
blanking time
Control logic circuit
Current selection
circuit
+
MD
CR1
-
VREF1
GND
No.7115-6/16
LB1946
VCC
VREF1
NC
CR1
MD
CLK
DATA
SET
ST
NC
CR2
NC
VREF2
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
VBB
NC
E1
NC
NC
OUTA-
OUTA
OUTB-
OUTB
NC
NC
E2
NC
VBB
LB1946
Top view
Timing Chart
1µs
CLOCK
1µs
DATA
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
SET
No.7115-7/16
LB1946
Serial Transmission Data Definitions
IA4
IA3
IA2
IA1
DE1
PH1
IB4
IB3
IB2
IB1
DE2
PH2
I/O
DEC
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
OUTA
OUTA-
OUTB
OUTB-
ratio
MODE
0
1
1
1
1
1
1
1
1
1
1
1
1
H
L
H
L
100%
SLOW
1
1
1
1
0
1
1
1
1
1
0
1
1
H
L
H
L
96
SLOW
2
1
1
0
1
1
1
1
1
0
1
1
1
H
L
H
L
91
SLOW
3
1
1
0
0
1
1
1
1
0
0
1
1
H
L
H
L
87
SLOW
4
1
0
1
1
1
1
1
0
1
1
1
1
H
L
H
L
83
SLOW
5
1
0
1
0
1
1
1
0
1
0
1
1
H
L
H
L
78
SLOW
6
1
0
0
1
1
1
1
0
0
1
1
1
H
L
H
L
74
SLOW
7
1
0
0
0
1
1
1
0
0
0
1
1
H
L
H
L
70
SLOW
8
0
1
1
1
1
1
0
1
1
1
1
1
H
L
H
L
61
SLOW
No.
Output mode
9
0
1
1
0
1
1
0
1
1
0
1
1
H
L
H
L
52
SLOW
10
0
1
0
1
1
1
0
1
0
1
1
1
H
L
H
L
44
SLOW
11
0
1
0
0
1
1
0
1
0
0
1
1
H
L
H
L
35
SLOW
12
0
0
1
1
1
1
0
0
1
1
1
1
H
L
H
L
26
SLOW
13
0
0
1
0
1
1
0
0
1
0
1
1
H
L
H
L
17
SLOW
14
1
1
1
1
0
0
1
1
1
1
0
0
L
H
L
H
100
FAST
15
1
1
1
0
0
0
1
1
1
0
0
0
L
H
L
H
96
FAST
16
1
1
0
1
0
0
1
1
0
1
0
0
L
H
L
H
91
FAST
17
1
1
0
0
0
0
1
1
0
0
0
0
L
H
L
H
87
FAST
18
1
0
1
1
0
0
1
0
1
1
0
0
L
H
L
H
83
FAST
19
1
0
1
0
0
0
1
0
1
0
0
0
L
H
L
H
78
FAST
20
1
0
0
1
0
0
1
0
0
1
0
0
L
H
L
H
74
FAST
21
1
0
0
0
0
0
1
0
0
0
0
0
L
H
L
H
70
FAST
22
0
1
1
1
0
0
0
1
1
1
0
0
L
H
L
H
61
FAST
23
0
1
1
0
0
0
0
1
1
0
0
0
L
H
L
H
52
FAST
24
0
1
0
1
0
0
0
1
0
1
0
0
L
H
L
H
44
FAST
25
0
1
0
0
0
0
0
1
0
0
0
0
L
H
L
H
35
FAST
26
0
0
1
1
0
0
0
0
1
1
0
0
L
H
L
H
26
FAST
27
0
0
1
0
0
0
0
0
1
0
0
0
L
H
L
H
17
FAST
28
0
0
0
0
*
*
0
0
0
0
*
*
OFF
OFF
OFF
OFF
0
-
Note *: Don't care (0 or 1)
Note 1: In the mixed decay mode, set D4 and D10 to 0 and set the MD pin to a level shown below.
Programmable MD voltage range
VCC=5V specifications: 1.6 to 3.9V
VCC=3.3V specifications: 1.2 to 2.5V
Current Settings Truth Table
* Items in parentheses are defined by the serial data.
IA4 (D0)
IA3 (D1)
IA2 (D2)
IA1 (D3)
Set Current IOUT
1
1
1
1
11.5/11.5×VREF/3.04RE=IOUT
Current Ratio (%)
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
Note 1: The current ratios shown are calculated values.
No.7115-8/16
LB1946
0.1µF
1.5V
680pF
30kΩ
5V
10µF
30kΩ
680pF
Sample Application Circuit at VCC=5V
Logic level inputs
CR1
MD
CLK
20
19
18
17
16
15
GND
NC
21
VREF2
VREF1
22
NC
23
CR2
24
NC
25
ST
26
SET
27
DATA
28
VCC
MD voltage setting
(1.6 to 3.9V)
Fast mode: GND
Slow mode: VCC
VBB
NC
E1
NC
NC
OUTA -
OUTA
OUTB -
OUTB
NC
NC
E2
NC
VBB
LB1946
1
2
3
4
5
6
7
8
9
10
11
12
13
14
L
L
SBD
SBD
47µF
42V
1Ω
1Ω
SBD SBD
Top view
No.7115-9/16
LB1946
0.1µF
1.0V
680pF
30kΩ
3.3V
10µF
30kΩ
680pF
Sample Application Circuit at VCC=3.3V
Logic level inputs
CR1
MD
CLK
20
19
18
17
16
15
GND
NC
21
VREF2
VREF1
22
NC
23
CR2
24
NC
25
ST
26
SET
27
DATA
28
VCC
MD voltage setting
(1.2 to 2.5V)
Fast mode: GND
Slow mode: VCC
VBB
NC
E1
NC
NC
OUTA -
OUTA
OUTB -
OUTB
NC
NC
E2
NC
VBB
LB1946
1
2
3
4
5
6
7
8
9
10
11
12
13
14
L
L
SBD
SBD
47µF
42V
SBD
1Ω
1Ω
SBD
Top view
No.7115-10/16
LB1946
Current Path in Slow Decay Mode
Regenerative current during upper-side transistor switching operation
VBB
ON
Current path when output is on
OFF
I
Regenerative current
when upper-side transistor is off
OUTA
OUTA
SBD
SBD
ON
Constant
Output OFF
Sense voltage comparator
VE
Motor current I
I=VE/RE
VREF
Re
VREF
3.04
Internal reference voltage generated
by setting voltage circuit
Figure 1
ILB01480
Current Path in Fast Decay Mode
VBB
ON
Current path when output is on
OFF
Current path in fast decay mode
OUTA
SBD
SBD
OUTA
ON
Sense voltage comparator
OFF
VREF
Re
VREF
3.04
ILB01481
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Switching Timing Chart During PWM Drive Mode
Slow decay (upper-side chopping)
Serial transmission data (D4, D10) = High
MD pin: Low
E pin
Output current
tn
CR pin
Output pin
Switching Waveform
ILB01482
FAST DECAY
Serial transmission data (D4, D10) = Low
MD pin: Low
Noise spike
E pin
Output current
CR pin
Output pin
Switching Waveform
ILB01483
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MIX DECAY
Noise spike
tm
E pin
Output current
tn
MD pin voltage level
CR pin
t on
Output pin
t off
Switching Waveform
ILB01484
Mix decay logic setting
When serial transmission data (D4, D10) is Low
MD pin setting:
5V VCC type: 1.6 to 3.9V
3.3V VCC type: 1.2 to 2.5V
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
t on: Output on time
t off: Output off time
tm: Fast decay time in mix decay mode
tn: Noise cancellation time
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1. Switching OFF time and noise cancellation time calculations
Notes on the CR pin setting (switching off time and noise canceller time)
The noise canceller time (Tn) and the switching off time (Toff) are set using the following formulas.
• When VCC=5V
Noise canceller time (Tn)
Tn ≈ CyRyln {(1.5 - RI)/(4.0 - RI)} [s]
CR pin charge current: 1.25mA
Switching off time (Toff)
Toff ≈ -CyRyln (1.5/4.8) [s]
Component value ranges
R: 5.6kΩ to 100kΩ
C: 470pF to 2000pF
• When VCC=3.3V
Noise canceller time (Tn)
Tn ≈ CyRyln {(1.06 - RI)/(2.66 - RI)} [s]
CR pin charge current: 0.7mA
Switching off time (Toff)
Toff ≈ -CyRyln (1.06/3.1) [s]
VCC line
One-shot multi-vibrator
blanking time circuit
CR pin
R : 30kΩ
C : 680pF
E1
Figure 2 CR Pin Internal Circuit Structure
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2. Notes on the MD pin
• If slow decay mode is set up by setting the D4 and D10 bits in the input serial data to 1, the MD pin must be shorted
to GND.
• If the decay mode is set up by setting the D4 and D10 bits in the input serial data to 0, decay mode can be set with the
MD pin.
When the VCC=5V specifications are used, the setting voltage range for mixed decay mode is 1.6 to 3.9V.
When the VCC=3.3V specifications are used, the setting voltage range for mixed decay mode is 1.2 to 2.5V.
If mixed decay mode will not be used with the fast decay mode setting, either:
Short the MD pin to GND to select fast decay mode, or
Short the MD pin to VCC to select slow decay mode.
3. Usage Notes
• Notes on the VREF pin
Since the VREF pin inputs the reference voltage used to set the current, applications must be designed so that noise
does not occur at this pin.
• Notes on the GND pins
Since this IC switches large currents, care is required with respect to the GND pins.
The PCB pattern in sections where large currents flow must be designed with low impedances and must be kept
separate from the small-signal system.
In particular, the GND terminals of the E pin sense resistor (RE) and external Schottky barrier diode GND terminals
must be located as close as possible to the IC GND. The capacitor between VCC and ground and between VBB and
GND must be as close as possible to the corresponding VCC and VBB pin in the pattern.
• Power on sequence
When turning the power systems on
VCC→logic level inputs (CLK, DATA, SET, and ST) →VREF→VBB
When turning the power systems off
VBB→VREF→logic level inputs (CLK, DATA, SET, and ST) →VCC
Note that if the power supply for the logic level inputs is on when the VCC power supply is off, a bias with an
unstable state will be applied to the protection diodes at the VCC pins, and this can cause incorrect operation.
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PS No.7115-16/16