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PDF LB1841 Datasheet ( Hoja de datos )

Número de pieza LB1841
Descripción Low-Saturation Current-Controlled Forward/Reverse Motor Driver
Fabricantes Sanyo 
Logotipo Sanyo Logotipo

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LB1841 Hoja de datos, Descripción, Manual
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 11
1 10
6.7
0.15
0.22 0.65 0.43
SANYO : SSOP20
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Applied input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Im max
VIN
Pd max
Topr
Tstg
Conditions
With substrate (50 × 35 × 1.6 mm3)
Ratings
10.5
800
–0.3 to +10
800
–20 to +80
–40 to +150
Unit
V
mA
V
mW
°C
°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.
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

1 page

LB1841 pdf
LB1841V
• Set current detection circuit
(1) When DEL = High
When the motor current IM is below the set current Ilimit, the input voltage (IM × Rf) 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 IM reaches the set current Ilimit, 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.
DEL OUT
limit
H Non-limit (saturation)
L Saturation
RD
L
H
H
Output Current Limiter and Setting Current Detection Circuits Block Diagram
Rf
VCC
VCC PBC
VS
VM
RS
LIR
VLIR
10RS
IM M
Setting current
detection circuit
P-G
DEL
RD
No. 4384-5/7

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