The LB1945H is a PWM current control type stepping motor driver.
Feature
•
PWM current control (external excitation)
•
Load current digital selection (1-2, W1-2, and 2 phase excitation drives possible)
•
Built-in upper/lower diode
•
Simultaneous ON prevention function (feed-through current prevention)
•
Built-in thermal shutdown circuit
•
Built-in noise canceler
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Maximum motor supply voltage
Output peak current
Output continuous current
Logic supply voltage
Logic input voltage range
Emitter output voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VBB max
IO peak
IO max
VCC max
VIN max
VE max
Pd max
Topr
Tstg
Mounted on a specified board *
tw
≤
20μs
Conditions
Ratings
30
1.0
0.8
6.0
-0.3 to VCC
1.0
1.9
-20 to +90
-55 to +150
Unit
V
A
A
V
V
V
W
°C
°C
* Specified board: 114.3mm
×
76.1mm
×
1.6mm, glass epoxy board.
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
30409 MS / 82799RM(KI) No.6193-1/7
LB1945H
Allowable Operating Ranges
at Ta = 25°C
Parameter
Motor supply voltage
Logic supply voltage
Reference voltage
Symbol
VBB
VCC
VREF
Conditions
Ratings
10 to 28
4.75 to 5.25
1.5 to 5.0
Unit
V
V
V
Electrical Characteristics
at Ta
=
25°C, VBB = 24V, VCC = 5V, VREF = 5.0V
Parameter
Output Block
Output stage supply current
IBB ON
IBB OFF
Output saturation voltage
VOsat1
VOsat2
VOsat3
VOsat4
Output leakage current
IO1(leak)
IO2(leak)
Output sustain voltage
Logic Block
Logic supply current
ICC ON
ICC OFF
Input voltage
VIH
VIL
Input current
IIH
IIL
Set current control threshold
value
Vref/Vsen
VIH = 3.2V
VIL = 0.8V
I1 = 0.8V, I2 = 0.8V
I1 = 3.2V, I2 = 0.8V
I1 = 0.8V, I2 = 3.2V
Reference current
CR pin current
Thermal shutdown temperature
Temperature hysteresis width
Iref
ICR
T-TSD
Ts hys
Vref = 5.0V, I1 = 0.8V, I2 = 0.8V
CR = 1.0V
Design guarantee value *
35
7
9.5
13.5
25.5
17.5
-1.0
170
40
50
10
10
15
30
25
I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V
ENABLE = 3.2V
50
7
3.2
0.8
65
13
10.5
16.5
34.5
32.5
μA
mA
°C
°C
70
10
92
13
mA
mA
V
V
μA
μA
VSUS
I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V
ENABLE = 3.2V
IO = +0.5A, sink
IO = +0.8A, sink
IO = -0.5A, source
IO = -0.8A, source
VO = VBB, sink
VO = 0V, source
L = 3.9mH, IO = 1.0A, Design guarantee value *
-50
30
0.3
0.5
1.6
1.8
0.5
1.0
2.0
0.2
0.5
0.7
1.8
2.0
50
mA
mA
V
V
V
V
μA
μA
V
Symbol
Conditions
min
Ratings
typ
max
Unit
* Design guarantee value, Do not measurement.
No.6193-2/7
LB1945H
Package Dimensions
unit : mm (typ)
3233B
2.4
15.2
(6.2)
28
15
Pd max -- Ta
Specified board: 114.3×76.1×1.6mm
3
glass epoxy board.
Allowable power dissipation, Pd max -- W
HEAT SPREADER
2.0
1.9
1.6
(4.9)
10.5
7.9
1.2
0.91
0.8
1
0.8
(0.8)
2.0
0.3
14
0.25
0.65
0.4
2.45max
(2.25)
0
-20
0
20
40
60
80
90
100
Ambient temperature, Ta --
°C
2.7
0.1
SANYO : HSOP28H(375mil)
Pin Assignment
OUTA 1
OUTA 2
NC 3
NC 4
E1 5
D-GND 6
VBB1 7
28 OUTB
27 OUTB
26 NC
25 NC
24 VBB2
23 E2
22 D-GND
LB1945H
VCC 8
PHASE1 9
ENABLE1 10
IA2 11
IA1 12
VREF1 13
GND 14
21 CR
20 PHASE2
19 ENABLE2
18 IB2
17 IB1
16 VREF2
15 S-GND
No.6193-3/7
Block Diagram
OUTA
1
2
7
28
27
24
OUTA
VBB1
OUTB
OUTB
VBB2
8
VCC
PHASE1
9
Control
logic
ciruit
Control
logic
ciruit
20
PHASE2
ENABLE1
10
19
ENABLE2
IA1
12
17
IB1
18
IB2
LB1945H
IA2
11
Thermal
shutdown
circuit
VREF1
13
Current
select
circuit
Blanking
time
OSC
Blanking
time
Current
select
circuit
16
VREF2
GND
14
15
S-GND
5
6
21
22
23
E1
D-GND
CR
D-GND
E2
No.6193-4/7
LB1945H
Truth Table
ENABLE
L
L
H
PHASE
H
L
−
OUTA
H
L
OFF
OUTA
L
H
OFF
I1
L
H
L
H
I2
L
L
H
H
Output current
Vref / (10
×
RE) = IOUT
Vref / (15
×
RE) = IOUT
×
2/3
Vref / (30
×
RE) = IOUT
×
1/3
0
Note: Output is OFF when ENABLE = H or when I1 = I2 = H.
Pin Function
Pin No.
7
24
5
23
2
1
27
28
14
15
6
22
21
13
16
9
20
Pin name
VBB1
VBB2
E1
E2
OUTA
OUTA
OUTB
OUTB
GND
S-GND
D-GND
D-GND
CR
VREF1
VREF2
PHASE1
PHASE2
Triangular wave chopping with CR constant setting.
Triangular wave OFF time is noise cancel time.
Output current setting pins.
(Output current is set by inputting a 1.5V to 7.5V voltage.)
Output phase select input pin.
High input: OUTA = H, OUTA = L
Low input: OUTA = L, OUTA = H
10
19
12,11
17,18
8
ENABLE1
ENABLE2
IA1,IA2
IB1,IB2
VCC
Output ON/OFF setting input pins.
High input: output OFF
Low input: output ON
Output current setting digital input pins.
Current is set to 1/3, 2/3, 1 by High and Low combinations.
Logic block power supply voltage pin.
Ground pin.
Sense ground pin.
Lower-side internal diode ground (anode).
Output pins.
Output stage power supply voltage pin.
Cathode pin for the upper-side diodes.
Insert resistor RE between these pins and ground to control set current.
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