LB1841V
No. 4384-1/7
LB1841V
Package Dimensions
unit: mm
3179A-SSOP20
Any and all SANYO 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 representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
73099RM(KI)
Ordering number : ENN4384A
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Monolithic Digital IC
Low-Saturation Current-Controlled
Forward/Reverse Motor Driver
[LB1841V]
SANYO : SSOP20
Specifications
Absolute Maximum Ratings
at Ta = 25
C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
10.5
V
Maximum output current
Im max
800
mA
Applied input voltage
V
IN
0.3 to +10
V
Allowable power dissipation
Pd max
With substrate (50
35
1.6 mm
3
)
800
mW
Operating temperature
Topr
20 to +80
C
Storage temperature
Tstg
40 to +150
C
1
10
11
6.4
6.7
0.5
4.4
0.1
1.6max
1.0
20
0.65
0.22
0.43
0.15
Overview
The LB1841V is a low-saturation current-controlled
forward/reverse motor driver with provision for a constant
voltage circuit using an external transistor and an output
current limiter function. Its design is optimized for use in
video camera loading motors.
Features
Built-in output current limiter and detector circuit
Built-in low-saturation voltage forward/reverse bridge
circuit: V
O
sat = 0.40V typ. at 400 mA
Little current drain in standby mode
(up to 0.1
A)
Built-in low-saturation constant voltage circuit using an
external pnp transistor
Built-in reference voltage linked to input
Built-in thermal shutdown circuit
Low external parts count. Compact SSOP-20 package
allows space saving design.
LB1841V
No. 4384-2/7
Electrical Characteristics
at Ta = 25
C, V
CC
= 7.2V
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Power supply current
I
CC
0
In standby mode
0.1
10
A
I
CC
1
Forward/reverse No load
9
13
mA
I
CC
2
In brake mode
12
18
mA
Output saturation voltage
Vsat 1
I
O
= 200 mA (upper side + lower side)
0.20
0.30
V
Vsat 2
I
O
= 400 mA (upper side + lower side)
0.40
0.60
V
Reference voltage
Vref
I
Vref
= 1 mA
1.85
2.0
2.15
V
Current limiter characteristics
I
limit
V
S
-V
M
resistance = 1
at LIR = 2V
165
185
205
mA
Input current
I
IN
V
IN
= 5V
90
150
A
PBC drive current
I
PBC
10
mA
Vs output voltage
V
S
2.55
V
SVR
V
RD saturation voltage
V
RD
sat
I
O
= 1 mA
0.3
V
Allowable Operating Ranges
at Ta = 25
C
Parameter
Symbol
Conditions
Ratings
Unit
Power supply voltage
V
CC
3.0 to 9.0
V
Input High voltage
V
IH
3.0 to 9.0
V
Input Low voltage
V
IL
0.3 to 0.7
V
SVR input voltage
V
SVR
1.0 to V
CC
0.2
V
LIR input voltage
V
LIR
0.5 to V
CC
1.0
V
Output current limiter
I
limit
50 to 350
mA
Constant-voltage output V
S
is determined by the equation V
S
= 2.55
V
SVR
.
The input range of V
SVR
is 1.0 to 4 V. When V
S
V
CC
, the output will be saturated.
The output current limiter value is determined according to the following equation (R
f
is a sensing resistor across V
S
and V
M
).
I limit = V
LIR
/10 R
f
(A)
V
LIR
input range is 0.5 to V
CC
1.0 (V).
Block Diagram and Sample Application Circuit
V
CC
= 3 to 10.5V
10
F
Vcc
SVR
LIR
PBC
V
S
V
M
OUT1
M
OUT2
P-G
RD
DEL
IN2
IN1
Thermal
shutdown
S-G
Vref
= 2.0V
0.001
F
to 0.01
F
V
S
= 5.1V
R
f
= 0.47 to 2
10
F
DECODER
Limit
detection
LB1841V
No. 4384-3/7
Pin Assignment
Truth Table
Bridge and V
S
circuits
Input
Output
Mode
IN1
IN2
OUT1
OUT2
V
S
L
L
off
off
off
Standby
H
L
H
L
H
Forward rotation
L
H
L
H
H
Reverse rotation
H
H
L
L
off
Brake
Output current limiter and detection output
DEL
OUT output
RD
H
limit
L
Non-limit
off
L
Saturation
off
Note) V
M
(motor power supply/sensing pin)
are both connected.
P-GND (motor power supply GND pin)
are both connected.
S-GND (control power supply ground
pin) is connected to microprocessor
ground.
Pd max Ta
20
0
20
40
60
80
100
800
600
400
200
0
1000
Ambient temperature, Ta
C
Allowable power dissipation, Pd max mW
Specified substrate (50
35
1.6 mm
3
, glass epoxy)
20
19
18
17
16
15
14
13
12
11
P-GND
OUT2
OUT2
LIR
SVR
DEL
IN2
IN1
RD
S-GND
1
2
3
4
5
6
7
8
9
10
P-GND
OUT1
OUT1
V
M
V
M
V
S
PBC
V
CC
Vref
NC
LB1841V
(Top view)
LB1841V
No. 4384-4/7
Sample Application Timing Chart
Sample Application timing chart
1 Connect DC motor (R
L
= R
) between OUT1 and OUT2, and input forward signal (IN1 = High, IN2 = Low)
with RD pin in pull-up state.
Because output is saturated during startup, set DEL input to Low.
2 DC motor starts and startup current (I
ST
= V
M
/R) flows through motor.
3 DC motor rotates in normal condition. At this point, set DEL input to High.
4 When DC motor locks up, motor current I
M
increases. When it reaches I
limit
(=V
LIR
/(10 R
f
)), output current
limiting circuit operates. At the same time, the set current detection circuit sets RD output to Low.
Reference voltage Vref
The Vref output is linked to the input. When IN1 or IN2 is High, the reference voltage is output.
Output current limiter circuitry
The circuit configuration is as shown in the separate diagram.
The output set current is determined by the reference voltage V
LIR
applied to the LIR pin. When V
LIR
is
applied, 1/10 of the voltage occurs across R
S
in the diagram. This voltage is input to the + side of the voltage
setting amplifier.
The motor current I
M
generates a voltage (I
M
R
f
) across the external resistor R
f
. This voltage is input to
the side of the amplifier. The differential amplifier operates so as to make the two inputs equal, then the
output transistor is driven.
The set current is determined by the following equation:
I
limit
= V
LIR
/(10R
f
) [A]
V(V)
IN1
IN2
DEL
G
I
O
OUT1
OUT2
RD
t (s)
V
M
R
V
LIR
10Rf
1
2
3
4
LB1841V
No. 4384-5/7
DEL
OUT
RD
H
limit
L
Non-limit (saturation)
H
L
Saturation
H
Set current detection circuit
(1) When DEL = High
When the motor current I
M
is below the set current I
limit
, the input voltage (I
M
R
f
) at the side of the current
setting amplifier is smaller than the input voltage at the + side (larger vs. ground). The drive current therefore
increases and the output pnp transistor saturates. When this condition is detected, a signal is sent to the set
current detection circuit and the RD output becomes High.
When the motor current I
M
reaches the set current I
limit
, the output pnp transistor is in the controlled state and
the RD output becomes Low.
(2) When DEL = Low
When a Low signal is input to the DEL pin, operation of the current setting amplifier is canceled. Therefore as
described above, the output transistor saturates and the RD output becomes High.
The above conditions are shown in the table below.
Output Current Limiter and Setting Current Detection Circuits Block Diagram
LIR
V
LIR
V
CC
V
CC
V
S
V
M
PBC
Rf
10R
S
I
M
R
D
P-G
DEL
R
S
M
Setting current
detection circuit
LB1841V
No. 4384-6/7
240
200
160
120
80
0
0
1
2
3
4
5
Input voltage, V
IN
V
I
IN
V
IN
Input current, I
IN
A
6
7
8
9
10
11
40
V
CC
= 8.0V
16
14
12
10
8
6
4
0
0
1
2
3
4
5
Power supply voltage, V
CC
V
I
CC
V
CC
Current drain, I
CC
mA
6
7
8
9
10
12
11
2
LIR = SVR = Vref
V
IN
= 5.0V
Rf = 0.5
, no load
DEL = L
Brake
DEL = H
Forward/
reverse
6
5
4
3
2
0
0
1
2
3
4
5
Power supply voltage, V
CC
V
V
S
V
CC
V
S
output voltage, V
S
V
6
7
8
9
10
11
1
V
IN
= 5.0V
SVR = Vref
10
8
6
4
0
0
0.4
0.8
1.2
1.6
2.0
SVR input voltage, V
SVR
V
V
S
V
SVR
V
S
output voltage, V
S
V
2.4
2.8
3.2
3.6
4.0
4.8
4.4
2
V
CC
= 8.0V
V
IN
= 3.0V
LIR = Vref
Forward/reverse
0.6
0.5
0.4
0.3
0.2
0
0
100
200
300
400
500
Output current, I
O
mA
V
O
(sat) I
O
Output saturation voltage, V
O
(sat) V
600
700
800
900
0.1
V
CC
= 6.0V
V
IN
= 3.0V
LIR = SVR = Vref
DEL = L
0.4
0.3
0.2
0
40
20
0
20
40
Ambient temperature, Ta
C
V
O
(sat) Ta
Output saturation voltage, V
O
(sat) V
60
80
100
120
160
140
0.1
V
CC
= 6.0V
V
IN
= 3.0V
LIR = SVR = Vref
DEL = L
I
O
= 400mA
200mA
400
300
200
0
0
1
2
3
4
Power supply voltage, V
CC
V
V
LIR
V
I limit V
CC
Output set current, I limit mA
5
6
7
8
9
11
10
100
SVR = Vref
V
IN
= 3.0V
R
L
= 10
Rf = 0.5
.
.
600
500
400
300
200
100
0
0
0.4
0.8
1.2
1.6
2.0
I limit V
LIR
Output set current, I limit mA
2.4
2.8
3.2
3.6
4.0
4.8
4.4
V
CC
= 6.0V
SVR = Vref
R
L
= 10
R f
= 0.5
1.0
Ilimit = 300mA
200mA
100mA
LB1841V
No. 4384-7/7
This catalog provides information as of July, 1999. Specifications and information herein are subject to change
without notice.
Specifications of any and all SANYO products described or contained herein stipulate the 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.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any 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 fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.
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mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
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
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