Sanyo EN4385B Low-saturation, current-controlled bidirectional motor driver Datasheet

Ordering number: EN 4385B
Monolithic Digital IC
LB1843V
Low-saturation, current-controlled
bidirectional motor driver
Overview
Package Dimensions
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.
unit : mm
3179A-SSOP20
[LB1843V]
Features
. Output current limiter and detector built in
. Low-saturation voltage bidirectional bridge circuit built in:
sat = 0.40 V typ. at 400 mA
. VPractically
current drain (0.1 µA or less) in standby mode
. Input-linkednoreference
voltage built in
. Thermal shutdown circuit
in
. Requires little space, sincebuilt
few external components are
O
SANYO : SSOP20
needed and the IC is contained in a small SSOP-20 package
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
Allowable power dissipation
VIN
Pd max
–0.3 to +10
With board ( 50 × 35 × 1.6 mm )
3
800
V
mW
Operating temperature
Topr
–20 to +80
°C
Storage temperature
Tstg
–40 to +150
°C
Ratings
Unit
Allowable Operating Ranges at Ta = 25°C
Parameter
Supply voltage
Symbol
Conditions
VCC
3.0 to 9.0
VM voltage
VM
2.2 to VCC
V
High-level input voltage
VIH
3.0 to 9.0
V
Low-level input voltage
VIL
V
–0.3 to +0.7
V
LIR input voltage
VLIR
0.5 to VCC–1.0
V
Output current limitation
Ilimit
50 to 350
mA
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3096HA(II) No.4385-1/6
LB1843V
Electrical Characteristics at Ta = 25°C, VCC = 7.2 V
Parameter
Reference voltage
Symbol
ICC0
ICC1
ICC2
Vsat1
Vsat2
Vref
Set output current
Ilimit
Supply current
Output saturation voltage
Input current
RD saturation voltage
IIN
VRDsat
Conditions
During standby
During bidirectional operation, no load
During braking
IO = 200 mA (upper side + lower side)
IO = 400 mA (upper side + lower side)
IVref = 1 mA
Resistance between VCC and VM = 1 Ω,
when LIR = 2 V
VIN = 5 V
IO = 1 mA
min
1.85
typ
0.1
9
12
0.20
0.40
2.0
max
10
13
18
0.30
0.60
2.15
Unit
µA
mA
mA
V
V
V
165
185
205
mA
90
150
0.3
µA
V
Allowable power dissipation, Pd max – mW
Output current limit is determined by the following equation (Rf is the sensing resistance between VCC and VM):
Ilimit = VLIR/10Rf (A)
The input range for VLIR is 0.5 to VCC–1.0 (V)
Pd max – Ta
Specified board (50 × 35 × 1.6 mm3 glass epoxy)
Ambient temperature, Ta – °C
No.4385-2/6
LB1843V
Block Diagram and Sample Application Ciruit
Rf = 0.47 to 2 Ω
VCC = 3 to 10.5 V
0.001 µF
to 0.01 µF
Thermal
shut down
Decoder
Limit detection
Pin Assignment
Notes:
. Connect both V pins
(motor power supply/sensing pins).
. Connect
both P-GND pins
(motor power supply GND pins).
. Connect S-GND (control power
M
supply GND pin) to the
microcontroller’s GND.
Top view
No.4385-3/6
LB1843V
Truth Table
Input
Output
IN1
IN2
OUT1
OUT2
Mode
L
L
off
off
Standby
H
L
H
L
Forward
L
H
L
H
Reverse
H
H
L
L
Brake
Output Current Limitation and Detector Output
DEL
H
L
OUT output
RD
Limit
L
Non-limit
Off
Saturated
Off
Sample Application Timing Chart
Sample application timing chart
1
Connect a DC motor (RL = RΩ) between OUT1 and OUT2, and with the RD pin pulled up, input a forward rotation signal
(IN1 = high, IN2 = low).
Because the output is used in the saturated state at startup, set the DEL input to low.
2 The DC motor starts up, and the startup current (IST = VM/R) flows to the motor.
3 The DC motor rotates in the normal state. At this point, set the DEL input to high.
4 If the DC motor locks, the motor current IM increases to the point of Ilimit (= VLIR/(10Rf)), the output current limiter operates
to limit the output current. At the same time, RD is output low from the set current detection circuit.
No.4385-4/6
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
H
L
OUT
RD
limit
L
Non-limit (saturated)
H
Saturated
H
Output Current Limiter and Set Current Detector Block Diagram
Set current
detector
No.4385-5/6
LB1843V
IIN – VIN
ICC – VCC
Bidirectional
Input current, IIN – µA
Brake
Current drain, ICC – mA
Rf = 0.5 Ω, no load
Set output current, Ilimit – mA
VLIR – V
VO(sat) – IO
Supply voltage, VCC – V
VO(sat) – Ta
Output saturation voltage, VO(sat) – V
Output saturation voltage, VO(sat) – V
Input voltage, VIN – V
Ilimit – VCC
Set output current, Ilimit – mA
Supply voltage, VCC – V
Ilimit – VLIR
Output current, IO – mA
Ambient temperature, Ta – °C
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.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 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:
2 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.
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 October, 1996. Specifications and information herein are subject to change without notice.
No.4385-6/6
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