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PDF LB1843V Data sheet ( Hoja de datos )
| Número de pieza | LB1843V | |
| Descripción | Low-saturation / current-controlled bidirectional motor driver | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number: EN 4385B
Monolithic Digital IC
LB1843V
Low-saturation, current-controlled
bidirectional motor driver
Overview
The LB1843V is a low-saturation bidirectional motor driver
with output current limitation and detection functions. This
design is ideal for controlling the loading motor in a video
camera.
Package Dimensions
unit : mm
3179A-SSOP20
[LB1843V]
Features
. Output current limiter and detector built in
. Low-saturation voltage bidirectional bridge circuit built in:
VOsat = 0.40 V typ. at 400 mA
. Practically no current drain (0.1 µA or less) in standby mode
. Input-linked reference voltage built in
. Thermal shutdown circuit built in
. Requires little space, since few external components are
needed and the IC is contained in a small SSOP-20 package
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 board ( 50 × 35 × 1.6 mm3 )
Allowable Operating Ranges at Ta = 25°C
Parameter
Supply voltage
VM voltage
High-level input voltage
Low-level input voltage
LIR input voltage
Output current limitation
Symbol
VCC
VM
VIH
VIL
VLIR
Ilimit
Conditions
SANYO : SSOP20
Ratings
10.5
800
–0.3 to +10
800
–20 to +80
–40 to +150
Unit
V
mA
V
mW
°C
°C
Ratings
3.0 to 9.0
2.2 to VCC
3.0 to 9.0
–0.3 to +0.7
0.5 to VCC–1.0
50 to 350
Unit
V
V
V
V
V
mA
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O3096HA(II) No.4385-1/6
1 page  
LB1843V
Reference voltage (Vref)
The Vref output is linked to the input; if either IN1 or IN2 is high, the reference voltage is output.
Output current limiter
The schematic for the output current limiter is shown below.
The output set current is set according to the reference voltage VLIR applied to the LIR pin. When VLIR is applied, 1/10 of that
voltage is generated at both ends of RS in the diagram; this voltage is input on the positive (+) side of the current setting
amplifier.
The motor current IM generates voltage equal to (IM × Rf) at both ends of the external resistor Rf. This voltage is input to the
negative (–) side of the same amplifier, and the differential amplifier functions and the output transistors are driven so that these
inputs become equal.
The set current value in this instance is determined by the following equation:
Ilimit = VLIR/(10Rf) [A]
Set current detector
(1) When DEL = high
If the motor current IM has not reached the set current Ilimit, the input voltage on the negative (–) side of the amplifier is
greater than the input voltage on the positive (+) side. As a result, the drive current increases and the output PNP transistors
reach the saturation state. If this state is detected, the detection signal is sent to the set current detector, and the RD output
goes high.
If the motor current IM reaches the set current Ilimit, the output PNP transistor enters the controlled state, and the RD output
goes low.
(2) When DEL = low
Because the operation of the current setting amplifier is cancelled when a low signal is input to the DEL pin, the output PNP
transistors reach the saturation state and the RD output goes high, just as in the case described above.
The following table summarizes the states described above.
DEL OUT
limit
H
Non-limit (saturated)
L Saturated
RD
L
H
H
Output Current Limiter and Set Current Detector Block Diagram
Set current
detector
No.4385-5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LB1843V.PDF ] | |
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