Overview
The LB1943 is a forward/reverse motor driver IC. This IC
supports forward, reverse, and braking control from a
single input, and the desired output voltage can be set with
a resistor. Either full drive or VC drive can be selected
from the single input, and the LB1943 can be controlled
from a microprocessor.
Functions
Single-input control of forward, reverse, and braking
operations
Resistor output voltage setup
Either full drive or VC drive can be selected from the
single control input.
Can be controlled from a microprocessor.
Built-in motor dash current absorbing device
Built-in reference voltage circuit
Built-in thermal protection circuit
Package Dimensions
unit: mm
3043A-SIP10
Monolithic Digital IC
22898HA (OT) No. 5806-1/5
SANYO: SIP10
[LB1943]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
Forward/Reverse Motor Driver with Braking Function
LB1943
Ordering number : EN5806
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
18
V
Input voltage
V
IN
V
CC
V
IN
0.3 to +6
V
Output current
I
OUT
1.6
A
Allowable power dissipation
Pd max
1.2
W
Operating temperature
Topr
25 to +75
C
Storage temperature
Tstg
55 to +125
C
Specifications
Absolute Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage range
V
CC
1
8 to 18
V
V
CC
2
V
CC
1
V
CC
2
5 to 18
V
Forward-reverse disabled time
Toff
Over 20
s
Allowable Operating Ranges
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Input low-level voltage
V
INL
0
1
V
Input high-level voltage
V
INH
4.2
6.0
V
Input mid-level voltage
V
INM
2
3
V
Input impedance
Z
IN
75
k
Current drain
I
CC
5.5
10.0
mA
Electrical Characteristics
at Ta = 25C, V
CC
= 12 V
Continued on next page.
No. 58062/5
LB1943
Continued from preceding page.
Note: Items marked with an asterisk (
*
) are design target values, and are not tested.
Input levels: V
H
: Over 4.2 V
V
M
: 2.0 to 3.0 V
V
L
: Under 1.0 V
IN1 and IN2 go to 2.5 V when left open.
LB1943 operation is equivalent to that of the LB1641.
Pin Assignment
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
V
OUT
1
R
L
= 60
, V
C
= 2.5 V
4.4
4.95
5.4
V
Output voltage
V
IN
1 = 2.5 V, V
IN
2 = 0 V
V
OUT
2
R
L
= 60
, V
C
= 2.5 V
4.4
4.95
5.4
V
V
IN
1 = 2.5 V, V
IN
2 = 5.0 V
Output leakage current
I
OL
R
L
=
0.01
1.0
mA
Saturation voltage (upper)
V (sat)11
V
CC
= 12V, I
OUT
= 300 mA
1.9
2.2
V
V (sat)12
V
CC
= 12V, I
OUT
= 500 mA
1.9
2.3
V
Saturation voltage (lower)
V (sat)21
V
CC
= 12V, I
OUT
= 300 mA
0.25
0.5
V
V (sat)22
V
CC
= 12V, I
OUT
= 500 mA
0.4
0.65
V
Reference power supply
V
REF
6.0
6.35
6.8
V
Reference voltage load characteristics
V
REF
/
I
REF
I
REF
= 0 to 2.0 mA
0.05
0.1
V/mA
Control-to-output gain
V
OUT
/V
C
, V
C
= 2.5 V, R
L
= 60
1.5
1.9
2.4
TSD operating temperature
T
STD
*
150
180
C
-25
0
0.4
0.6
0.8
1.0
1.2
1.4
0
25
50
75
100
Pd max Ta
Allowable power dissipation, Pd max W
Ambient temperature, Ta
C
0.6
Tj = 125
C
Truth Table
Input
Output voltage
Operation
IN1
IN2
OUT1
OUT2
H
H
L
FULL
Forward (reverse) operation
M
H
L
V
C
2
Forward (reverse) operation
L
H
L
V
C
2
Forward (reverse) operation
H
M
OFF
OFF
Braking
M
M
OFF
OFF
Braking
L
M
OFF
OFF
Braking
H
L
FULL
L
Reverse (forward) operation
M
L
V
C
2
L
Reverse (forward) operation
L
L
V
C
2
L
Reverse (forward) operation
No. 58063/5
LB1943
Pin No.
Symbol
Pin function
Equivalent circuit
Pin Functions
1
GND
Power system ground. This line is shared with the signal system
ground.
3
IN1
Output voltage switching input
Goes to V
M
(about 2.5 V) when left open.
4
IN2
Forward, reverse, or braking control input
Goes to V
M
(about 2.5 V) when left open.
6
V
C
Output voltage setting
7
V
REF
Reference voltage output. V
REF
= 6.35 V
8
V
CC
1
Signal system power supply
9
V
CC
2
Power system power supply
2
10
OUT1
OUT2
Outputs that are connected to the motor coils
Internal Equivalent Circuit
No. 58064/5
LB1943
Peripheral Circuit Example
Usage Notes
1. The microprocessor output ports are CMOS outputs, and must be used in the high, low, or open states.
2. We recommend using a value of about 60 k
for R1 and R2.
3. Voltages applied to the IN1 and IN2 pins must not exceed the range 0 to 6 V. Note that negative voltages can cause
the IC to operate incorrectly. Also, do not apply voltages to IN1 or IN2 when the V
CC
voltage is not applied.
4. To prevent the upper and lower output transistors from both being in the on state at the same time, when switching
the IN1 and IN2 values, always hold the input open for a brief period during the transition. We recommend holding
the open state for a few tens of microseconds.
5. A capacitor must be inserted between V
CC
and ground. We recommend that this capacitor have a value of at least
20 F.
Microcontroller control port
Motor
Logic circuit
Pre-driver
Thermal
protection circuit
Reference
voltage circuit
PS No. 5806-5/5
LB1943
6. During motor drive, large currents (on the order of several hundred mA) flow in the motor power supply block.
Therefore, the printed circuit board layout and interconnections must be designed so that there are no shared devices.
7. If negative voltages are applied to OUT1 and OUT2 and the IC operates incorrectly, insert Schottky diodes between
OUT1 and ground and between OUT2 and ground.
This catalog provides information as of February, 1998. Specifications and information herein are subject to
change without notice.
s
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
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