Datasheet LB1841V Datasheet (SANYO)

Ordering number : ENN4384A

LB1841V

Monolithic Digital IC

LB1841V

Low-Saturation Current-Controlled

Forward/Reverse Motor Driver

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: VOsat = 0.40V typ. at 400 mA

• Little current drain in standby mode
(up to 0.1 µA)

• 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.

Package Dimensions

unit: mm

3179A-SSOP20

[LB1841V]

20

110

6.7

11

0.650.22 0.43

4.4

0.15

1.6max

0.1

SANYO : SSOP20

1.0

6.4

0.5

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 10.5 V
Maximum output current Im max 800 mA
Applied input voltage V
Allowable power dissipation Pd max With substrate (50 × 35 × 1.6 mm3) 800 mW
Operating temperature Topr –20 to +80 °C
Storage temperature Tstg –40 to +150 °C

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.

IN

–0.3 to +10 V

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

73099RM(KI)

No. 4384-1/7

LB1841V

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Power supply voltage V
Input High voltage V
Input Low voltage V
SVR input voltage V
LIR input voltage V
Output current limiter I

CC

IH

IL

SVR

LIR

limit

Electrical Characteristics at Ta = 25°C, VCC = 7.2V

Parameter Symbol Conditions
Power supply current ICC 0 In standby mode 0.1 10 µA

ICC 1 Forward/reverse No load 9 13 mA
ICC 2 In brake mode 12 18 mA

Output saturation voltage Vsat 1 IO = 200 mA (upper side + lower side) 0.20 0.30 V

Vsat 2 IO = 400 mA (upper side + lower side) 0.40 0.60 V
Reference voltage Vref I
Current limiter characteristics I
Input current I
PBC drive current I
Vs output voltage V

limit

IN

PBC

S

= 1 mA 1.85 2.0 2.15 V

Vref

VS-VM resistance = 1Ω at LIR = 2V 165 185 205 mA
VIN = 5V 90 150 µA

RD saturation voltage VRDsat IO = 1 mA 0.3 V

min typ max

3.0 to 9.0 V

3.0 to 9.0 V

–0.3 to 0.7 V

1.0 to VCC–0.2 V

0.5 to VCC–1.0 V
50 to 350 mA

Ratings

–10 mA

2.55×V

SVR

Unit

V

Constant-voltage output VS is determined by the equation VS = 2.55 × V
The input range of V

is 1.0 to 4 V. When VS ≥ VCC, the output will be saturated.

SVR

SVR

.

The output current limiter value is determined according to the following equation (Rf is a sensing resistor across VS and VM).

I limit = V

V

input range is 0.5 to VCC –1.0 (V).

LIR

/10 Rf(A)

LIR

Block Diagram and Sample Application Circuit

VCC = 3 to 10.5V

10µF

SVR

LIR

VS = 5.1V

10µF

cc

PBC V

S

V

= 0.47 to 2Ω

R

f

V

M

OUT1

0.001µF
to 0.01µF

OUT2
P-G

M

Vref
= 2.0V

Thermal

shutdown

S-G

DECODER

RD

Limit

detection

DELIN2IN1

No. 4384-2/7

Pin Assignment

P-GND

OUT1
OUT1

V

LB1841V

1
2
3

4

M

20
19
18

17

P-GND
OUT2
OUT2

LIR

V

5

Note) • VM (motor power supply/sensing pin)

are both connected.

• P-GND (motor power supply GND pin)
are both connected.

• S-GND (control power supply ground

V

PBC

V

V

NC

M

S

CC

ref

LB1841V

6
7
8
9

10

pin) is connected to microprocessor
ground.

Truth Table

Bridge and VS circuits

Input Output

IN1 IN2 OUT1 OUT2 V

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

S

16
15
14
13
12
11

(Top view)

Mode

SVR
DEL
IN2
IN1
RD
S-GND

Pd max – Ta

1000

Specified substrate (50×35×1.6 mm3, glass epoxy)

800

600

400

200

Allowable power dissipation, Pd max – mW

0

–20 0 20 40 60 80 100

Ambient temperature, Ta – °C

No. 4384-3/7

Sample Application Timing Chart

V(V)

IN1

IN2

DEL

IO

G

OUT1

OUT2

V

M

R

LB1841V

V

10R

LIR

f

RD

1 2 3 4

t (s)

• Sample Application timing chart
1 Connect DC motor (RL = RΩ) 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 (IST = VM/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 IM increases. When it reaches I

limit

(=V

/(10 Rf)), output current

LIR

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

applied to the LIR pin. When V

LIR

applied, 1/10 of the voltage occurs across RS in the diagram. This voltage is input to the + side of the voltage
setting amplifier.
The motor current IM generates a voltage (IM × Rf) across the external resistor Rf. 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

/(10Rf) [A]

LIR

LIR

is

No. 4384-4/7

• Set current detection circuit

(1) When DEL = High

When the motor current IM is below the set current I
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 IM reaches the set current I
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.

DEL OUT RD

H
L Saturation H

Non-limit (saturation) H

limit L

LB1841V

limit

limit

, the input voltage (IM × Rf) at the – side of the current

, the output pnp transistor is in the controlled state and

Output Current Limiter and Setting Current Detection Circuits Block Diagram

R

f

V

V

CC

LIR

V

LIR

V

PBC

CC

10R

S

R

S

I

M

S

P-G

M

V

M

Setting current
detection circuit

DEL

R

D

No. 4384-5/7

LB1841V

16

LIR = SVR = Vref
VIN = 5.0V

14

Rf = 0.5Ω, no load

12

– mA

10

CC

8

6

Current drain, I

4

2

0

01 2 345

Power supply voltage, VCC – V

6

VIN = 5.0V
SVR = Vref

5

– V

S

4

3

2

output voltage, V

S

V

1

ICC – V

CC

Brake

DEL = L

DEL = H

6 7 8 9 10 1211

VS – V

CC

Forward/reverse

Forward/
reverse

240

200

160

– µA

IN

120

80

Input current, I

40

0

012 345

Input voltage, VIN – V

10

VCC = 8.0V
V

= 3.0V

IN

LIR = Vref

8

– V

S

6

4

output voltage, V

S

V

2

IIN – V

IN

6 7 8 9 10 11

VS – V

SVR

VCC = 8.0V

0

012 345

Power supply voltage, VCC – V

600

I limit – V

VCC = 6.0V
SVR = Vref

500

R

= 10Ω

L

400

300

200

Output set current, I limit – mA

100

0

0 0.4 0.8 1.2 1.6 2.0

0.6

= 0.5Ω

f

R

1.0Ω

VO(sat) – I

VCC = 6.0V
V

= 3.0V

IN

0.5

LIR = SVR = Vref
DEL = L

(sat) – V

O

0.4

6 7 8 9 10 11

LIR

2.4 2.8 3.2 3.6 4.0 4.84.4

– V

LIR

O

0

0 0.4 0.8 1.2 1.6 2.0

SVR input voltage, V

400

I limit – V

SVR = Vref
V

= 3.0V

IN

R

= 10Ω

L

.

R

= 0.5Ω

.

f

300

200

100

Output set current, I limit – mA

0

01234

Power supply voltage, VCC – VV

0.4

VO(sat) – Ta

VCC = 6.0V
V

= 3.0V

IN

LIR = SVR = Vref
DEL = L

0.3

(sat) – V

O

2.4 2.8 3.2 3.6 4.0 4.84.4

SVR

– V

CC

Ilimit = 300mA

200mA

100mA

6789 1110

5

= 400mA

I

O

0.3

0.2

0.1

Output saturation voltage, V

0

0 100 200 300 400 500

Output current, IO – mA

600 700 800 900

0.2

0.1

Output saturation voltage, V

0

–40 –20 0 20 40

Ambient temperature, Ta – °C

200mA

60 80 100 120 160

140

No. 4384-6/7

LB1841V

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.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
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
or other rights of third parties.

This catalog provides information as of July, 1999. Specifications and information herein are subject to change
without notice.

No. 4384-7/7

PS