LV8075LP Motor Driver Application Note

LV8075LP
Bi-CMOS LSI
Constant-voltage Control
1-channel Forward/Reverse DC
Motor Driver
Application Note
http://onsemi.com
Overview
The LV8075LP is a low voltage bidirectional DC motor driver with a typical input voltage of 2.5 to 5.5 V and
output currents up to 500mA. The unique output full-bridge incorporates source-side linear operation to allow
a constant voltage across the motor coil. This regulated output minimizes motor voltage change due to I
×RDS (ON) variation and battery voltage tolerance.
Internal protection circuitry includes thermal shutdown, under voltage lockout.
Function
 Constant voltage control forward/reverse H-bridge
Parallel input-Analog value must be entered for constant voltage reference input
V (OUT) = V (VC)  2.0
 500mA output peak rating
 Low power standby mode
 Small 2.6mm×2.6mm, 0.80mm nominal height VCT16 package
 Control voltage and motor voltage separable
 Built-in thermal protection circuit and under-voltage detection protection circuit
 -30 to 85 operating temperature range
Typical Applications
 Camera lens/shutters/lens barrier control
 Battery powered toys and games
 Portable printers/scanners
 Robotics actuators and pumps
 Low noise test instrumentation systems
Typical Application
TOP VIEW
SIDE VIEW
BOTTOM VIEW
(0.125)
(0.13)
2.6
(C0.116)
2
15
14
13
(NC)
(NC)
VREF
1
IN2
2
EN
SGND 12
VC 11
LV8075LP
1
0.5
LASER MARKED
INDEX
16
IN1
16
0.4
2.6
CPU
＋VBATT
3
VM
VCC 10
4
OUT1
(0.55)
PGND
(NC)
(NC)
5
6
7
8
0.25
(0.035)
0.8
SIDE VIEW
OUT2 9
PGND
DCmotor
SANYO : VCT16(2.6X2.6)
Semiconductor Components Industries, LLC, 2013
December, 2013
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LV8075LP Application Note
Pin Assignment
(NC)
(NC)
VREF
16
15
14
13
1
12 SGND
EN
2
11 VC
VM
3
10 VCC
OUT1
4
9
5
6
7
PGND PGND
OUT2
8
(NC)
Pd max -- Ta
0.8
Allowable power dissipation, Pd max -- W
IN2
IN1
(NC)
0.6
0.4
0.36
0.2
0
-30 -20
Top view
Specified board : 40.0×50.0×0.8mm3
4-layer grass epoxy
0.7
0
20
40
60
8085
100
Ambient temperature, Ta -- °C
Block Diagram
VCC
Start-up
control
block
EN
200kΩ
VREF
Thermal
protection
circuit
Under-voltage
detection
circuit
Reference
voltage
circuit
VM
IN1
200kΩ
Motor control
logic
IN2
OUT1
Constant-voltage
control pre-driver
OUT2
200kΩ
PGND
VC
SGND
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LV8075LP Application Note
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Maximum control power supply
Symbol
Conditions
Ratings
Unit
VCC max
6
Maximum load power supply
VM max
6
V
Maximum control pin voltage
VC max
6
V
Maximum output current
IO max
VREF maximum current
IREF max
Allowable power dissipation
OUT1, 2
0.5
VREF
Pd max
V
Mounted on a circuit board*
A
1
mA
700
mW
Operating temperature
Topr
-30 to +85
C
Storage temperature
Tstg
-40 to +150
C
* Specified circuit board : 40.050.00.8mm3 : glass epoxy four-layer board
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 Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions at Ta = 25C
Parameter
Control power-supply voltage
Symbol
Conditions
Ratings
min
typ
Unit
max
VCC
2.5
5.5
V
Load power-supply voltage
VM
2.5
5.5
V
Output control input voltage
Vcont
VC pin
0
VCC-1
V
Input pin “H” voltage
VINH
IN1, 2,EN pin
VCC  0.6
VCC+0.3
V
Input pin “L” voltage
VINL
IN1, 2,EN pin
-0.1
VCC  0.2
V
Electrical Characteristics at Ta = 25°C, VCC = VM = 3.0V, PGND = SGND = 0V, unless otherwise specified.
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
A
Standby current consumption 1
ICCO
EN, IN1, 2 = H/L/L or EN = L
1
Standby current consumption 1
IMO
EN, IN1, 2 = H/L/L or EN = L
1
A
Operating current consumption
VCC1
0.5
1.0
mA
15
20
A
0
1
A
1.5
1.6
V
EN = H, IN1 or IN2 = H
H-level input current
IINH
200k pull-down, VIN = 3V
L-level input current
IINL
VIN = 0V
Reference voltage output
VREF
IREF = 500F
Output on-resistance
Ron1
Total of top and bottom
Constant-voltage control output
VOUT
VC = 1.0V
10
1.4
1.75
2.5

1.94
2.0
2.06
V
voltage
Under-voltage detection
VCS
VCC Voltage
2.1
2.2
2.35
V
TSD
Design guarantee value*
150
operating voltage
180
210
C
Output rise time
Tr
(Note)
1.6
3.0
s
Output fall time
Tf
(Note)
0.2
1.0
s
Thermal protection temperature
* Design guarantee value and no measurement is made.
Note : Specify rising control start time  90% of OUT output voltage, and falling control start time  10% of OUT output voltage.
3 / 17
LV8075LP Application Note
Truth Table
Constant voltage output H-bridge
EN
IN1
IN2
OUT1
OUT2
Mode
H
H
H
L
L
Brake
H
L
H
L
Forward evolution
L
H
L
H
Reverse rotation
L
L
off
off
Stand by
-
-
off
off
Stand by
L
“-“ entries indicate don't care state, “off” indicates output off state, insert 20k impedance across PGND.
Constant voltage output value : V (OUT) = V (VC) 2.0
Pin Functions
Pin No.
Pin name
Description
10
VCC
Power supply pin for control
5, 6
PGND
Power ground pins for IC
12
SGND
IC system ground
3
VM
Power supply pin for constant voltage output H-bridge
2
EN
IC enable pin. Power-saving mode is established when L-level is applied.
Pulled-down with 200k
16, 1
IN1, 2
Input pins for manipulating constant-current output H-bridge (OUT1, 2) .
Pulled-down with 200k
4, 9
OUT1, 2
Constant voltage H-bridge output pins
13
VREF
Reference voltage output, outputs 1.5V
11
VC
Analog voltage input pin for constant voltage setting.
Must be short-circuited to VCC pin when using saturation control.
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LV8075LP Application Note
Reference data
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LV8075LP Application Note
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LV8075LP Application Note
APPLICATION INFORMATION
1. Constant voltage output
VC
Constant
voltage AMP
Constant
voltage AMP
Analog
switch
VM
Analog
switch
OUT1
OUTPUT
Control
Logic
OUT2
10kΩ
10kΩ
10kΩ
10kΩ
PGND
LV8075LP controls output voltage by controlling Pch power transistor to detect the voltage of OUT in order to
obtain VOUT voltage of VC×2.0.
However, make sure that the voltage of VOUT does not exceed VM.
Constant-voltage control is unnecessary. When you use this IC for Full-drive, make sure to short VC and VCC.
OUT has impedance of 20kΩ to PGND.
2. Thermal Shutdown
The LV8075LP will disable the outputs if the junction temperature reaches 180°C.
When temperature falls 30 °C, the IC outputs a set output mode.
3. Low voltage protection function
When the power supply voltage is as follows 2.2V in LV8075LP, OFF does the output.
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LV8075LP Application Note
Motor connecting figure
Control
Input
16
15
14
13
IN1
(NC)
(NC)
VREF
1
IN2
SGND 12
2
EN
VC 11
LV8075LP
C1
Motor
voltage
supply
Constant
voltage output
setting
3
VM
4
OUT1
C2
VCC 10
+
10uF
0.1uF
Control
voltage
supply
OUT2 9
PGND
PGND
(NC)
(NC)
5
6
7
8
DCmotor
VCC and VM can be used as common pins.
Even when you apply different voltage to VCC and VM, you can supply higher voltage to either one of the two
pins. Also either one of the two can be powered first.
The output voltage of VREF is 1.5V.
When VC and VREF are connected, you can set 3.0V of output voltage for OUT.
The capacitor C1 and C2 are used to stabilize the power supply. A requirement for capacitance may vary
depends on a layout of board, capability of motor or power supply.
Recommendation range for C1: approx. 0.1μF to 10μF
Recommendation range for C2: approx. 0.01μF to 1μF
In order to set an optimum capacitance for stable power supply, make sure to confirm the waveform of the
supply voltage of a motor under operation
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LV8075LP Application Note
Waveform example
No load
VCC=VM=5V VC=1.0V IN2=”L”
No load
VCC=VM=5V VC=2.0V IN2=”L”
IN1
IN1
OUT1
Forwar Stand-by
d
Forwar Stand-by
d
OUT2
10us/div
No load
OUT1
10us/div
VCC=VM=5V VC=1.0V IN2=”H”
Brake
No load
VCC=VM=5V VC=2.0V IN2=”H”
IN1
IN1
OUT1
OUT1
Brake
Revers
OUT2
10us/div
No load
OUT2
Revers
OUT2
10us/div
VCC=VM=5V VC=3.0V IN2=”H”
IN1
OUT1
Brake
Revers
OUT2
10us/div
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LV8075LP Application Note
No load VCC=VM=5V VC=3.0V IN2=”H”
Time scale expansion
“fall time”
Revers
Brake
IN1
IN1
OUT1
OUT1
OUT2
Brake
Revers
OUT2
0.5us/div
0.1us/div
No load VCC=VM=3V VC=3.0V IN2=”H”
Time scale expansion
“fall time”
Revers
0.1us/div
No load VCC=VM=5V VC=3.0V IN2=”H”
Time scale expansion
“rise time”
Brake
No load VCC=VM=3V VC=3.0V IN2=”H”
Time scale expansion
“rise time”
IN1
IN1
OUT1
OUT1
OUT2
Brake
Revers
OUT2
0.5us/div
10/17
LV8075LP Application Note
DC motor load VCC=VM=3V VC=3.0V IN2=”H”
Current waveform example
“motor start”
IN1
OUT1
OUT2
Icoil
Brake
Revers
Motor stop
Motor rotate
20ms/div
High current flows when the DC motor starts to rotate. After a while, induced voltage “Ea” is generated from
motor and current value gradually decreases in the course of motor rotation.
Given that the coil resistor is Rcoil, motor supply voltage is Vm, the motor current Im is obtained as follows: Im=
(Vm-Ea) /Rcoil
DC motor load VCC=VM=3V VC=3.0V IN2=”H”
Current waveform example
“brake current”
IN1
OUT1
OUT2
Icoil
20ms/div
Brake
Revers
Motor stop
Motor rotate
Brake
By setting brake mode while the DC motor is under rotation, DC motor becomes short-brake state and thereby
decreases rotation count rapidly.
In this case, the current of Im=Ea/Rcoil flows reversely due to the induced voltage Ea generated while the
motor was under rotation. And by stopping the rotation of DC motor, Ea becomes 0. Therefore, the current also
becomes 0.
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LV8075LP Application Note
DC motor load VCC=VM=3V VC=3.0V
Current waveform example
“active reverse brake current”
IN1
IN2
OUT1
Icoil
Motor stop
20ms/div
Forwar
d
Revers
If a direction of rotation is switched while the DC motor is under rotation, torque for reverse rotation is
generated. Therefore, the change of rotation takes place more abruptly.
In this case, since the voltage of VM is added as well as the induced voltage Ea that occurred during the motor
rotation, the following current flows: Im= (VM+Ea) /Rcoil
Since this driving method generates the highest current at the startup of DC motor, if the current value exceeds
the Iomax, it is recommended to set brake mode between forward and reverse to reduce induced voltage.
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LV8075LP Application Note
Evaluation board description
16
15
14
13
IN1
(NC)
(NC)
VREF
1
IN2
2
EN
SGND 12
VC 11
LV8075LP
C1
+
3
VM
VCC 10
4
OUT1
10uF
OUT2 9
PGND
PGND
(NC)
(NC)
5
6
7
8
Bill of Materials for LV8075LP Evaluation Board
Designator
Qty
Description
IC1
1
Motor Driver
C1
1
VCC Bypass
capacitor
TP1-TP11
11
Test points
Value
10µF
50V
Tol
Footprint
Manufacturer
Manufacturer
Part Number
Substitution
Allowed
Lead
Free
VCT16
ON
Semiconductor
LV8075LP
No
Yes
SUN Electronic
Industries
50ME10HC
Yes
Yes
MAC8
ST-1-3
Yes
Yes
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LV8075LP Application Note
OUTPUT Full-Drive (VCC-VC short)
VM
Bypass capacitor
：10μF
（Electrolytic capacitor）
Logic input
“VCC”
Power Supply
“VM”
Power Supply
M
 Connect OUT1 and OUT2 to a DC motor each.
 Connect the motor power supply with the terminal VM, the control power supply with the terminal VCC.
Connect the GND line with the terminal GND.
 DC motor becomes the predetermined output state corresponding to the input state by inputting a signal
such as the following truth value table into EN, IN1, IN2.
 See the table in p.4 for further information on input logic.
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LV8075LP Application Note
OUTPUT constant voltage 3.0V drive (VREF-VC short)
VM
Bypass capacitor
：10μF
（Electrolytic capacitor）
Logic input
“VCC”
Power Supply
“VM”
Power Supply
M
OUTPUT constant voltage 1.5V drive (VC voltage setting)
VM
Bypass capacitor
：10μF
（Electrolytic capacitor）
10kΩ
10kΩ
Logic input
“VCC”
Power Supply
“VM”
Power Supply
M
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LV8075LP Application Note
Recommended Soldering Footprint
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LV8075LP Application Note
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