EN7633 D

Ordering number : EN7633A
LB1945D
Monolithic Digital IC
PWM Current Control
http://onsemi.com
Stepping Motor Driver
Overview
The LB1945D is a PWM current control stepping motor driver that uses a bipolar drive technique. It is optimal for use
with the carriage and paper feed stepping motors used in printers.
Functions and Features
• PWM current control (external clock)
• Digital load current selection function (supports 1-2, W1-2, and 2-phase excitation)
• Built-in high and low side diodes
• Simultaneous on state prevention function (through-current prevention)
• Built-in thermal shutdown circuit
• Noise canceling function
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Motor supply voltage
VBB max
Output peak current
IO peak
Output continuous current
Logic system supply voltage
Conditions
tW ≤ 20μs
Ratings
Unit
30
V
1.0
A
IO max
0.8
A
VCC max
6.0
V
Logic input voltage range
VIN
-0.3 to VCC
V
Emitter output voltage range
VE
1.0
V
Allowable power dissipation
Pd max
2.8
W
Operating temperature
Topr
Independent IC
-20 to +90
°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
41107 TI PC B8-6489, 6394 No.7633-1/9
LB1945D
Recommended Operating Range at Ta = 25°C
Parameter
Symbol
Motor supply voltage
Conditions
Ratings
Unit
VBB
10 to 28
V
Logic system supply voltage
VCC
4.75 to 5.25
V
Reference voltage
VREF
1.5 to 5.0
V
Electrical Characteristics at Ta = 25°C, VBB = 24V, VCC = 5V, VREF = 5V
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
Output block
IBB ON
IBB OFF
I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V
Output saturation voltage 1
VO sat1
IO = +0.5A, sink side
0.3
0.5
V
Output saturation voltage 2
VO sat2
IO = +0.8A, sink side
0.5
0.7
V
Output saturation voltage 3
VO sat3
IO = -0.5A, source side
1.6
1.8
V
VO sat4
IO = -0.8A, source side
1.8
2.0
V
50
μA
Output stage supply current
Output saturation voltage 4
Output leakage current
Output sustain voltage
0.5
1.0
2.0
ENABLE = 3.2V
mA
0.2
VO1(leak)
VO2(leak)
VO = VBB, sink side
VO = 0V, source side
-50
VSUS
L = 3.9mH, IO = 1.0A*
30
I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V
50
70.0
92
7
10.0
13
V
Logic block
ICC ON
ICC OFF
Logic supply current
ENABLE = 3.2V
VIH
VIL
Input voltage
Input current
mA
3.2
V
1.8
IIH
VIH = 3.2V
VIL = 0.8V
IIL
35
50
65
7
10
13
Set current control threshold
VREF/
I1 = 0.8V, I2 = 0.8V
9.5
10
10.5
value
VSEN
I1 = 3.2V, I2 = 0.8V
13.5
15
16.5
I1 = 0.8V, I2 = 3.2V
25.5
30
34.5
25
32.5
μA
μA
Reference current
IREF
VREF = 5.0V, I1 = 0.8V, I2 = 0.8V
17.5
CR pin current
ICR
CR = 1.0V
-1.0
Thermal shutdown temperature
TS
170
°C
TSHY
40
°C
Thermal shutdown hysteresis
μA
*: The design specification items are design guarantees and are not measured.
Package Dimensions
unit:mm (typ)
3147C
Pd max – Ta
15
12.7
11.2
R1.7
0.4
8.4
28
1
14
20.0
4.0
4.0
26.75
(1.81)
1.78
0.6
Allowable power dissipation, Pd max – W
3.5
3.0
2.8
2.5
2.0
1.5
1.34
1.0
0.5
0
-20
1.0
Independent IC
0
20
40
60
80
100
Ambient temperature, Ta – °C
SANYO : DIP28H(500mil)
No.7633-2/9
LB1945D
21
GND
22
VREF1
23
IA1
D-GND
24
IA2
E1
25
ENABLE1
SUBGND
26
PHASE1
NC
27
VCC
OUTA
28
VBB
OUTA
Pin Assignment
20
19
18
17
16
15
9
10
11
12
13
14
S-GND
VREF2
IB1
IB2
ENABLE2
8
CR
7
D-GND
6
E2
5
VBB
4
SUBGND
3
NC
OUTB
2
OUTB
1
PHASE2
LB1945D
Top view
ILB01555
Pin Functions
Pin No.
Pin
22
VBB1
5
VBB2
24
E1
6
E2
27
OUTA
28
OUTA
2
OUTB
1
OUTB
Description
Output stage power supply voltage
High side diode cathode connection
The set current is controlled by inserting resistors RE between these pins and ground.
Output pins
15
GND
14
S-GND
Ground
Sense ground
4, 25
SUBGND
IC sub-ground
23
D-GND
Low side built-in diode ground (anode side)
7
8
CR
Chopping is performed at the period of a triangle wave set by the RC circuit connected to this pin.
The triangle wave off time is the noise cancellation time.
16
VREF1
13
VREF2
Output current settings.
20
PHASE1
Output phase switching inputs
9
PHASE2
High-level input: OUTA = high, OUTA = low
19
ENABLE1
Output on/off control inputs
10
ENABLE2
High-level input: Output off
17, 18
IA1, IA2
Output current setting digital inputs.
12, 11
IB1, IB2
The output current is set to 1/3, 2/3 or 1 by input high/low levels to these pins.
21
VCC
(The output current is determined by providing an input in the range 1.5V to 5V.)
Low-level input: OUTA = low, OUTA = high
Low-level input: Output on
Logic block power supply voltage
No.7633-3/9
LB1945D
S-GND
SUBGND
VREF2
IB2
IB1
ENABLE2
PHASE2
VCC
Block Diagram
Current selection
circuit
Control logic circuit
VBB2
Blanking time
OUTB
E2
OUTB
D-GND
Thermal
shutdown
circuit
VBB1
OSC
CR
D-GND
OUTA
E1
OUTA
Blanking time
GND
SUBGND
IA2
IA1
ENABLE1
PHASE1
VREF1
Current selection
circuit
Control logic
circuit
ILB01559
No.7633-4/9
LB1945D
Application circuit
Motor L
Motor L
1
OUTB
OUTA
28
2
OUTB
OUTA
27
3
NC
4
SUBGND
5
VBB
6
E2
7
D-GND
NC 26
SUBGND 25
0.5Ω
E1 24
0.5Ω
820pF
8
CR
D-GND 23
24V
VBB 22
LB1945D
47μF
5V
VCC 21
10μF
56kΩ
9
PHASE2
PHASE1 20
10
ENABLE2
ENABLE1 19
11
IB2
IA2 18
12
IB1
IA1 17
13
VREF2
VREF1 16
14
S-GND
GND 15
Logic input
Logic input
10μF
5V
ILB01556
No.7633-5/9
LB1945D
Truth Table
ENABLE
PHASE
OUTA
Low
High
High
OUTA
Low
Low
Low
Low
High
High
-
OFF
OFF
I1
I2
Output current
Low
Low
Vref/(10 × RE) = IOUT
High
Low
Vref/(15 × RE) = IOUT × 2/3
Low
High
Vref/(30 × RE) = IOUT × 1/3
High
High
0
Note: The output is turned off when ENABLE is high or in the I1 = I2 = high state.
Clockwise/counterclockwise Operating Sequence
2-phase excitation drive
Clockwise rotation
IA1 = IA2 = IB1 = IB2 = 0
No.
PHASE1
OUTA
OUTA
PHASE2
OUTB
OUTB
0
0
0
1
0
0
1
1
1
1
0
0
0
1
2
1
1
0
1
1
0
3
0
0
1
1
1
0
No.
PHASE1
OUTA
OUTA
PHASE2
OUTB
OUTB
0
0
0
1
1
1
0
1
1
1
0
1
1
0
2
1
1
0
0
0
1
3
0
0
1
0
0
1
Counterclockwise rotation
IA1 = IA2 = IB1 = IB2 = 0
Control Sequence
2-phase excitation
Table 1
ENABLE1 = ENABLE2 = 0
Phase A
NO
Phase B
PH1
IA2
IA1
Current value
PH2
IB2
IB1
Current value
0
0
0
0
1
0
0
0
1
1
1
0
0
1
0
0
0
1
2
1
0
0
1
1
0
0
1
3
0
0
0
1
1
0
0
1
1-2 phase excitation - 1/2 step
Table 2
ENABLE1 = ENABLE2 = 0
Phase A
No.
Phase B
PH1
IA2
IA1
Current value
PH2
IB2
IB1
Current value
0
0
0
0
1
*
1
1
0
1
0
0
1
2/3
0
0
1
2/3
2
*
1
1
0
0
0
0
1
3
1
0
1
2/3
0
0
1
2/3
4
1
0
0
1
*
1
1
0
5
1
0
1
2/3
1
0
1
2/3
6
*
1
1
0
1
0
0
1
7
0
0
1
2/3
1
0
1
2/3
No.7633-6/9
LB1945D
1-2 phase Excitation Timing Chart
PH1
IA2
IA1
PH2
IB2
IB1
IOUT1
VOUT1
0
1
2
3
4
5
6
7
IOUT2
VOUT2
1 cycle = T
ILB01558
No.7633-7/9
LB1945D
W1-2 phase excitation - about 1/4 step
Table 3
ENABLE1 = ENABLE2 = 0
Phase A
NO
PH1
IA2
Phase B
IA1
Current value
PH2
IB2
IB1
Current value
0
0
0
0
1
*
1
1
0
1
0
0
0
1
0
1
0
1/3
2
0
0
1
2/3
0
0
1
2/3
3
0
1
0
1/3
0
0
0
1
4
*
1
1
0
0
0
0
1
5
1
1
0
1/3
0
0
0
1
6
1
0
1
2/3
0
0
1
2/3
7
1
0
0
1
0
1
0
1/3
8
1
0
0
1
*
1
1
0
9
1
0
0
1
1
1
0
1/3
10
1
0
1
2/3
1
0
1
2/3
11
1
1
0
1/3
1
0
0
1
12
*
1
1
0
1
0
0
1
13
0
1
0
1/3
1
0
0
1
14
0
0
1
2/3
1
0
1
2/3
15
0
0
0
1
1
1
0
1/3
W1-2 phase Excitation Timing Chart
PH
IA
IA
PH
IB
IB
IOUT
VOU
0
1
2
3
4
5
6
7
8
9
10
11
12
13 14
15
IOUT
VOU
1 cycle =
ILB01557
No.7633-8/9
LB1945D
Simplified Equations for Determining RC Component Values
The equations for setting the RC oscillator circuit rise time (T1) and fall time (T2) are shown below.
T1 ≈ 0.44C × R (s)
T2 ≈ 0.72 × ( C × R × 1000 )/( R + 1000 ) (s)
(C:220 to 4700pF, R = 10 to 150kΩ)
The oscillator frequency must be set using the simplified equations shown above.
Note that the triangle wave fall time (T2) is also used as the noise canceller time.
Motor
CR
T2
T1
T2
Usage Notes
1. VREF
Since the VREF pin is the input pin for the reference voltage that sets the current, applications must be designed so that
noise does not appear on this pin.
2. Ground pins
Since this IC switches high currents, the following points concerning grounding must be observed.
• The fins on the package rear surface, pins 7 and 8, and pins 21 and 22 must all be grounded.
• Sections of the circuit that carry large currents must be implemented with wide lines in the printed circuit
pattern, and must be physically separated from the small signal system.
• The E pin sense resistor (RE) must be position as close as possible to the IC ground (pin 14).
• The capacitors between VCC and ground and between VBB and ground must be positioned as close as
possible to the VCC and VBB pins on the printed circuit pattern.
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PS No.7633-9/9
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