LB1845_06 [SANYO]
PWM Current Controlling Stepping Motor Driver; PWM电流控制步进电机驱动器
| 型号： | LB1845_06 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | PWM Current Controlling Stepping Motor Driver |
| 文件： | 总9页 (文件大小：198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : EN5505D
Monolithic Digital IC
PWM Current Controlling
Stepping Motor Driver
LB1845
Overview
The LB1845 is a PWM current control type stepping motor driver that uses a bipolar drive scheme. It is particularly
suitable for driving carriage and paper feed stepping motors in printers and similar products.
Features
• PWM current control (fixed off time scheme)
• Digital load current selection function
• Sustained output voltage: 45V
• Built-in thermal shutdown circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Motor supply voltage
Symbol
max
Conditions
Ratings
Unit
V
V
45
1.75
1.5
BB
Peak output current
I
peak
max
tW ≤ 20µs
A
O
Continuous output current
Logic block supply voltage
Logic input voltage range
Emitter output voltage
I
A
O
V
7.0
V
CC
V
-0.3 to V
V
IN
CC
1.0
V
V
E
Allowable power dissipation
Pd max1
Pd max2
Topr
Independent IC
3.0
20.0
W
W
°C
°C
With an arbitrarily large heat sink
Operating temperature
Storage temperature
-20 to +85
-55 to +150
Tstg
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 usingany 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.
O1806 MS IM / D3096HA (OT) No.5505-1/9
LB1845
Recommended Operating Ranges at Ta = 25°C
Parameter
Motor supply voltage
Symbol
Conditions
Ratings
Unit
V
V
10 to 44.5
4.75 to 5.25
1.5 to 7.5
BB
Logic block supply voltage
Reference voltage
V
V
CC
V
V
REF
Electrical Characteristics at Ta = 25°C, V
= 38V, V
= 5V, V
= 5V
REF
BB
CC
Ratings
typ
Parameter
Symbol
Conditions
unit
mA
V
min
max
[Output Block]
Output stage supply current
Output saturation voltage 1
I
ON
12
0.7
1.2
1.4
1.1
1.3
16
BB
I
OFF
0.9
1.4
1.7
1.3
1.6
50
BB
V
V
V
V
I
(sat)1
(sat)2
(sat)3
(sat)4
I
I
I
I
= +1.0A Sink
O
O
O
O
O
O
O
O
= +1.5A Sink
= -1.0A Source
= -1.5A Source
Output leakage current
(leak)1
(leak)2
V
V
*
= V
Sink
= 0V Source
O
O
BB
µA
I
-50
O
O
Sustained output voltage
[Logic Block]
V(sus)
45
V
Logic supply current
I
ON
CC
I
= 0.8V, I = 0.8V
1
19.5
15.5
25.3
20.1
0
mA
V
I
OFF
CC
I
= 2.4V, I = 2.4V
1
0
Input voltage
V
2.4
IH
V
0.8
10
IL
Input current
I
V
V
I
= 2.4V
IH
IH
µA
I
= 0.8V
IL
-10
9.5
IL
Current control threshold voltage
V
/V
= 0.8V, I = 0.8V
1
10
15
10.5
16.5
34.5
REF SENSE
0
I
I
= 2.4V, I = 0.8V
1
13.5
25.5
0
0
= 0.8V, I = 2.4V
1
30
Thermal shutdown temperature
T
S
170
°C
* Note: Design guaranteed value.
Package Dimensions
unit: mm (typ)
3147C
28
15
R1.7
1
14
20.0
26.75
(1.81)
1.78
0.6
1.0
SANYO : DIP28H(500mil)
No.5505-2/9
LB1845
Pd max - Ta
24
20
16
12
8
With an arbitrarily large heat sink
10.4
1.56
Independent IC
4
3
0
--20
0
20
40
60
80
100
ILB00880
Ambient Temperature, Ta- °C
Truth Table
ENABLE
PHASE
OUTA
H
OUTB
L
L
L
H
L
-
L
H
H
OFF
OFF
I
I
Output Current
0
1
L
H
L
L
L
V
/(10×R ) = I
E
REF OUT
V
V
/(15×R ) = I
×2/3
REF
REF
E
OUT
OUT
H
H
/(30×R ) = I
×1/3
E
H
0
Note: Outputs is OFF when ENABLE is high or in the I = I = high state.
0
1
Pin Assignment
28 27 26 25 24 23 22 21 20 19 18 17 16 15
LB1845
1
2
3
4
5
6
7
8
9
10 11 12 13 14
ILB00881
No.5505-3/9
LB1845
Block Diagram
V
V
BB
BB
SBD
SBD
SBD
SBD
OUT 1B
OUT 1A
OUT 2B
OUT 2A
V
BB
V
CC
PHASE1
–
PHASE2
–
+
+
V
V
2
REF1
REF
–
+
–
+
–
+
–
+
ENABLE1
ENABLE2
ONE
SHOT
ONE
SHOT
I 1
0
I 2
0
–
+
–
+
RC1
D-GND
RC2
I 1
1
E1
SENSE1
GND
E2
SENSE2
I 2
1
1kΩ
1kΩ
–
+
–
+
ILB00882
Application Circuit Diagram
Ccc
100µF
Cbb
V
V
CC
BB
1
2
3
28
Ct
SENSE1
E1
RC1
27
Rt
Cc
V
1
REF
26
Re
D-GND
4
PHASE1
25
NC
5
ENABLE1
24
SBD
SBD
OUT1B
6
I11
23
Motor
OUT1A
7
I01
22
OUT2B
8
I02
21
SBD
SBD
OUT2A
9
I12
20
NC
10
ENABLE2
19
D-GND
11
PHASE2
18
Off time setting
values
toff≈CtRt
Re=0.82Ω(1W)
E2
12
V
2
REF
Re
Cc
V
=5V
17
REF
Rt=56kΩ
SENSE2
13
RC2
16
R1
Ct
Ct=470pF
Rc=1kΩ
Cc=330pF
Cbb=100µF
V
GND
15
BB
14
ILB00883
No.5505-4/9
LB1845
Pin Description
Pin No
Pin
Function
1, 14
V
Output stage power-supply voltage
Set current detection pins.
BB
SENSE1
SENSE2
E1
2
13
Connect these pins, fed back through noise filters, to E1 and E2.
3
The set current is controlled by the resistors Re inserted between these pins and ground.
12
E2
4, 11
D-GND
Internal diode anode connection
Outputs
6
7
OUT1B
OUT1A
OUT2B
OUT2A
GND
8
9
15
Ground
27
16
26
17
RC1
RC2
Used to set the output off time for the switched output signal.
The fixed off times are set by the capacitors and resistors connected to these pins. toff = CR.
Output current settings
V
V
1
2
REF
REF
The output current is determined by the voltage (in the range 1.5 to 7.5V) input to these pins.
25
18
PHASE1
PHASE2
Output phase switching inputs.
High-level input: OUTA = high, OUTB = low
Low-level input: OUTA = low, OUTB = high
24
19
ENABLE1
ENABLE2
Output on/off settings
High-level input: output off
Low-level input: output on
22, 23
21, 20
I 1, I 1
Digital inputs that set the output current
0
1
I 2, I 2
The output currents can be set to 1/3, 2/3, or full by setting these pins to appropriate combinations of high and low levels.
0
1
28
V
Logic block power supply
CC
Timing chart for pin switching operations during PWM drive
RC pin
t
d
Spike noise
E pin
SENSE pin
V
pin
t
off
OUT
ILB00884
Figure 1 Switching Waveforms
t
: Output off time. Determined by external capacitor and resistor Ct and Rt. (toff ≈ Ct × Rt)
off
t : Delay time between the point the set current is sensed at the SENSE pin and the point the output turns off.
d
No.5505-5/9
LB1845
Usage Notes
1. External diode
Since this IC adopts a system based on lower side transistor switching drive, an external diode for the regenerative
current that occurs during switching is required between V
feedthrough current.
and V . Use a Schottky barrier diode with a low
OUT
BB
2. Noise filters
Since spike noise (see Figure 1) occurs when switching to the on state due to the external diode’s feedthrough current,
applications must remove noise from the SENSE pin with a noise filter (Cc, Rc) between the E pin and the SENSE
pin.
However, note that if the values of Cc and Rc are too large, the SENSE voltage rise will be slowed, and the current
setting will be shifted towards a higher current level.
3. V
pin
REF
It is possible to change the output current continuously by continuously changing the V
pin voltage. However,
REF
pin input impedance is 26kΩ (±30%) when V
this voltage cannot be set to 0V. The V
used to set the output current, applications must be designed so that noise does not appear on this pin's input.
is 5V. Since this pin is
REF
REF
4. GND pin
Since this IC switches large currents, care must be taken to avoid ground loops when the IC is mounted in the
application. The section of the PCB that handles large currents should be designed with a low-impedance pattern, and
must be separated from the small signal sections of the circuit. In particular, the ground for the sense resistor Re must
be as close as possible to the IC ground.
5. Operation in hold mode
There are cases where a current somewhat larger than the current setting may flow in hold mode (light load mode).
Since this IC adopts a lower side switching, lower side sense system, the emitter voltage falls and the sense voltage
goes to 0 when the switching state goes to off. The circuit then always turns the output on after the toff period has
elapsed. At this time, due to the light load, the existence of the time td, and the fact that the output goes on even if the
output current is higher than the set current, the output current will be somewhat higher than the set current.
Applications should set the current setting somewhat lower than required if this occurs.
6. Function for preventing the upper and lower outputs being on at the same time
This IC incorporates a built-in circuit that prevents the through currents that occur when the phase is switched. The
table lists the output on and off delay times when PHASE and EANBLE are switched.
Sink side
10µs
Source side
9µs
On delay time
Off delay time
On delay time
Off delay time
When PHASE is switched
When ENABLE is on
1.5µs
9µs
3µs
9µs
1.5µs
6.5µs
7. 1-2 phase excitation and the double 1-2 phase excitation control sequence
To reduce the vibration that occurs when the motor turns, this IC supports 1-2 phase excitation and double 1-2 phase
excitation by using the output current setting digital input pins I and I without changing the V pin voltage.
0
1
REF
Tables 1 and 2 list that control sequence, and Figure 2 and Figure 3 present the composite vector diagram for this
sequence.2. Noise filters
No.5505-6/9
LB1845
Table 1 [1-2 phase excitation] 1/2 Step
ENABLE1 = ENABLE2 = 0
Phase A
Phase B
No
Current
Value
Current
PH1
I 1
1
I 1
0
PH2
I 2
1
I 2
0
Value
0
0
1
2
3
4
5
6
7
0
0
*
0
0
1
0
0
0
1
0
0
1
1
1
0
1
1
1
1
2/3
0
*
1
0
0
0
1
0
0
0
1
1
0
1
1
1
0
1
0
0
0
*
2/3
1
1
1
1
*
2/3
1
2/3
0
2/3
0
1
1
1
2/3
1
0
2/3
2/3
Table 2 [Double 1-2 phase excitation] about 1/4 Step
ENABLE1 = ENABLE2 = 0
Phase A
Phase B
No
Current
Value
Current
PH1
I 1
1
I 1
0
PH2
I 2
1
I 2
0
Value
0
0
1
0
0
0
0
*
0
0
0
1
1
1
0
0
0
0
0
1
1
1
0
0
0
0
1
0
1
0
1
0
0
0
1
0
1
0
1
0
1
1
*
1
1
0
0
0
0
0
1
1
1
0
0
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
0
0
0
1
0
0
0
0
0
0
0
0
*
1/3
2/3
1
2
2/3
1/3
0
3
4
1
5
1
1
1
1
1
1
1
*
1/3
2/3
1
1
6
2/3
1/3
0
7
8
1
9
1
1
1
1
1
1
1
1
1/3
2/3
1
10
11
12
13
14
15
2/3
1/3
0
1
0
0
0
1/3
2/3
1
1
2/3
1/3
Composite Vector Diagram
[1-2 phase excitation]
[Double 1-2 phase excitation]
Phase B
Phase B
(4)
(2)
(3)
(1)
(2)
(1)
(0)
(0)
Phase A
Phase A
ILB00885
ILB00886
Figure 3 Composite Vector Diagram for the
Sequence in Table 2 (1/4 cycle)
Figure 2 Composite Vector Diagram for the
Sequence in Table 1 (1/4 cycle)
No.5505-7/9
LB1845
I
- V
BB
I
I
- V
BB
CC, BB CC
16
14
12
10
8
32
28
24
20
16
12
8
32
28
24
20
16
12
8
V
V
=5V
V
=38V
BB
CC
=5V
V
=5V
REF
REF
Output off
6
4
2
0
4
0
4
0
I
Output off
BB
0
0
0
4
8
12 16 20 24 28 32 36 40 44 46
0
1
2
3
4
5
6
7
8
Output Stage Power-Supply Voltage, V - V ILB00887
BB
ILB00888
Logic Block Supply Voltage, V - V
CC
I
I
- V
V (sat) - I
O OUT
CC, BB
CC
32
28
24
20
16
12
8
32
28
24
20
16
12
8
1.6
1.2
0.8
V
V
=38V
=5V
BB
REF
Output on
(Sink side)
0.4
0
V
V
V
=45V
=5V
=5V
BB
CC
REF
4
0
4
0
1
2
3
4
5
6
7
8
0
0.4
0.8
1.2
1.6
2.0
2.4
ILB00890
Logic Block Supply Voltage, V - V ILB00889
CC
Output Current, I - A
OUT
V (sat) -- I
O
OUT
1.6
1.2
0.8
(Source side)
0.4
0
V
V
V
=45V
=5V
BB
CC
REF
=5V
0.4
0.8
1.2
1.6
2.0
2.4
ILB00891
Output Current, I
OUT
- A
No.5505-8/9
LB1845
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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.
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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
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so that these kinds of accidents or events cannot occur. Such measures include but are not limited to
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for the SANYO Semiconductor product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
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reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual
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This catalog provides information as of October, 2006. Specifications and information herein are subject
to change without notice.
PS No.5505-9/9
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