LB1843V - ON Semiconductor

Ordering number : EN4385D
LB1843V
Monolithic Linear IC
Low-saturation, current-controlled
bidirectional motor driver
http://onsemi.com
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.
Function
• 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
SSOP20 (225mil)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
Conditions
Ratings
Unit
VCC max
10.5
V
800
mA
Maximum output current
Im max
Applied Input voltage
VIN
Allowable power dissipation
Pd max
Operating temperature
Topr
-20 to +80
°C
Storage temperature
Tstg
-40 to +150
°C
-0.3 to +10
With board (50x35x1.6mm)
V
800
mW
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Recommended Operating Conditions at Ta = 25°C
Parameter
Supply voltage
Symbol
Conditions
VCC
Ratings
min
typ
max
Unit
3.0
9.0
V
VM voltage
VM
2.2
VCC
V
High-level input voltage
VIH
3.0
9.0
V
Low-level input voltage
VIL
-0.3
+0.7
V
LIR input voltage
VLIR
0.5
VCC-1.0
Output current limitation
I limit
50
350
V
mA
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
ORDERING INFORMATION
See detailed ordering and shipping information on page 10 of this data sheet.
Semiconductor Components Industries, LLC, 2014
February, 2014
22814NK B8-7154 / O3096HA(II) No.4385-1/10
LB1843V
Electrical Characteristics at Ta = 25°C, VCC = 7.2V
Parameter
Supply current
Symbol
Conditions
ICC0
During standby
ICC1
During bidirectional operation, no load
Ratings
min
typ
Unit
max
0.1
10
μA
9
13
mA
mA
ICC2
During braking
12
18
Output saturation voltage
Vsat1
IOUT = 200mA (upper side + lower side)
0.20
0.30
V
(upper side + lower side)
Vsat2
IOUT = 400mA (upper side + lower side)
0.40
0.60
V
Reference voltage
Vref
IVref = 1mA
1.85
2.0
2.15
V
Set output current
Ilimit
Resistance between VCC and VM = 1Ω,
165
185
205
mA
90
150
μA
0.3
V
when LIR = 2V
Input current
RD saturation voltage
IIN
VIN = 5V
VRDsat
Io = 1mA
Output current limit is determined by the following equation (Rf is the sensing resistance between VCC and VM):
I limit = VLIR / 10Rf (A)
The input range for VLIR is 0.5 to VCC – 1.0(V)
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
No.4385-2/10
LB1843V
Package Dimensions
SSOP20 (225mil)
CASE 565AN
ISSUE A
SOLDERING FOOTPRINT*
5.80
1.0
(Unit: mm)
0.32
GENERIC
MARKING DIAGRAM*
XXXXXXXXXX
YMDDD
0.65
NOTE: The measurements are not to guarantee but for reference only.
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
XXXXX = Specific Device Code
Y = Year
M = Month
DDD = Additional Traceability Data
*This information is generic. Please refer to
device data sheet for actual part marking.
No.4385-3/10
LB1843V
Block Diagram and Sample Application Circuit
Pin Assignment
No.4385-4/10
LB1843V
Pin Functions
Pin No.
Pin name
Pin Function
13
IN1
Control signal input pin
14
IN2
Control signal input pin
Equivalent Circuit
VCC
50K
80K
4K
S-GND
15
DEL
Control signal input pin
4,5
VM
Output current detect pin
2,3
OUT1
Out pin
18,19
OUT2
Out pin
Continued on next page.
No.4385-5/10
LB1843V
Continued from preceding page.
9
Vref
Reference voltage output pin
12
RD
Lock detect signal output pin
17
LIR
Output current setting pin
Power supply voltage pin
6
VCC
11
S-GND
Signal ground pin
1,20
P-GND
Power ground pin
NC
No connect
7,8,10,16
No.4385-6/10
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 = R) 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.4385-7/10
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 output
RD
Limit
L
Non-limit
Off
Saturated
Off
Output Current Limiter and Set Current Detector Block Diagram
No.4385-8/10
LB1843V
ICC -- VCC
VIN=3V
LIR=Vref
Rf=0.5W, no load
Current drain, ICC -- mA
14
Brake
Bidirectional
DEL=L
8
DEL=H
6
4
0
1
2
3
4
5
6
7
8
9
10
Supply voltage, VCC -- V
.5
W
400
W
1.0
200
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
4.4
0.2
0.1
100
200
300
400
500
600
Output current, IO -- mA
700
800
ILB00878
5
6
7
8
9
11
Ilimit -- VCC
Ilimit=300mA
200mA
100mA
100
0.3
10
ILB00875
0
1
2
3
4
5
6
7
8
9
Supply voltage, VCC -- V
Output saturation voltage, VO(sat) -- V
0.3
4
200
0.4
0.4
0
3
ILB00876
VCC=6.0V
VIN=3.0V
LIR=Vref
DEL=L
0.5
2
300
0
4.8
VO(sat) -- IO
0.6
1
Input voltage, VIN -- V
Set output current, Ilimit -- mA
VCC=6.0V
RL=10W
300
0
400
R
f =0
Set output current, Ilimit -- mA
80
0
12
500
0
120
ILB00874
VLIR -- V
Output saturation voltage, VO(sat) -- V
11
Ilimit -- VLIR
600
0
160
40
2
0
VCC=6.0V
200
12
10
IIN -- VIN
240
Input current, IIN -- mA
16
10
11
ILB00877
VO(sat) -- Ta
VCC=6.0V
VIN=3.0V
LIR=Vref
DEL=L
A
0m
I O=40
0.2
200mA
0.1
0
--40
--20
0
20
40
60
80
100
120
140
160
ILB00879
No.4385-9/10
LB1843V
ORDERING INFORMATION
Device
LB1843V-MPB-E
Package
SSOP20 (225mil)
(Pb-Free / Halogen Free)
LB1843V-TLM-E
SSOP20 (225mil)
(Pb-Free / Halogen Free)
Shipping (Qty / Packing)
70 / Fan-Fold
2000 / Tape & Reel
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PS No.4385-10/10