1 Publication Order Number :
LV8741V/D
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© Semiconductor Components Industries, LLC, 2015
June 2015 - Re v. 2
ORDERING INFORMATION
See detailed ordering and shipping information on page 28 of this data sheet.
LV8741V
Overview
The LV8741V is a 2-channel H-bridge driver IC that can switch a stepper
motor driver, which is capable of micro-step drive and supports
Quarter-step excitation, and two channels of a brushed motor driver,
which supports forward, reverse, brake, and standby of a motor. It is
ideally suited for driving brushed DC motors and stepper motors used in
office equipment and amusement applications.
Feature
Single-channel PWM current control stepper motor driver (selectable
with DC motor driver channel 2) incorporated.
BiCDMOS process IC
On resistance (upper side : 0.5 ; lower side : 0.5 ; total of upper and
lower : 1.0 ; Ta = 25C, IO = 1.5A)
Excitation mode can be set to Full-step, Half-step full torque, Half-step or Quarter-step
Excitation step proceeds only by step signal input
Motor current selectable in four steps
IO max = 1.5A
Output short-circuit protection circuit (selectable from latch-type or auto reset-type) incorporated
Thermal shutdown circuit and power supply monitor circuit incorporated
Support control power supply VCC = 2.7V to 5.5V
Typical Applications
Stepper/Brush DC Motors
Computing & Peripherals, Industrial
Printers, Inkjet Printer, Multi-Function Printer
Flatbed Scanner, Document Scanner
Slot Machine, Vending Machine, Cash Machine
SSOP44K (275mil)
Bi-CMOS IC
PWM Current Control Stepper
Motor Driver
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Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Symbol Conditions Ratings Unit
Supply voltage 1 VM max VM , VM1 , VM2 38 V
Supply voltage 2 VCC max 6 V
Output peak current IO peak tw 10ms, duty 20% , Per 1ch 1.75 A
Output current IO max Per 1ch 1.5 A
Logic input voltage VIN ST , OE , DM , MD1/DC11 , MD2/DC12 ,
FR/DC21 , STP/DC22 , RST , EMM , ATT1 ,
ATT2
-0.3 to VCC+0.3 V
EMO input voltage VEMO -0.3 to VCC+0.3 V
Allowable power dissipation 1 Pd max1 Independent IC 0.55 W
Allowable power dissipation 2 Pd max2 * 2.9 W
Operating temperature Topr -20 to +85 C
Storage temperature Tstg -55 to +150 C
* Specified circuit board : 90901.7mm3 : glass epoxy printed circuit board with back mounting.
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.
Recommended Operating Conditions at Ta = 25C
Parameter Symbol Conditions Ratings Unit
Supply voltage range 1 VM VM , VM1 , VM2 9.5 to 35 V
Supply voltage range 2 VCC 2.7 to 5.5 V
VREF input voltage range VREF 0 to VCC-1.8 V
Logic voltage range VIN ST , OE , DM , MD1/DC11 , MD2/DC12 ,
FR/DC21 , STP/DC22 , RST , EMM , ATT1 ,
ATT2
0 to VCC V
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.
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.
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Electrical Characteristics at Ta = 25°C, VM = 24V, VCC = 5V, VREF = 1.5V
Parameter Symbol Conditions Ratings
Unit
min typ max
Standby mode current drain 1 IMstn ST = ”L” , I(VM)+I(VM1)+I(VM2) 150 200 A
Current drain 1 IM ST = ”H”, OE = ”H”, no load
I(VM)+I(VM1)+I(VM2)
0.75 1 mA
Standby mode current drain 2 ICCstn ST = ”L” 110 160 A
Current drain 2 ICC ST = ”H”, OE = ”H”, no load 2.5 3 mA
VCC low-voltage cutoff voltage VthVCC ST = ”H”, OE = ”H”, no load 2.2 2.35 2.5 V
Low-voltage hysteresis voltage VthHIS 100 150 200 mV
Thermal shutdown temperature TSD Design guarantee 180 C
Thermal hysteresis width TSD Design guarantee 40 C
Output on-resistance Ronu IO = 1.5A, Upper-side on resistance 0.5 0.7
Rond IO = 1.5A, Lower-side on resistance 0.5 0.6
Output leakage current IOleak VM = 35V 50 A
Diode forward voltage 1 VD1 ID = -1.0A 1 1.3 V
Diode forward voltage 2 VD2 ID = -1.5A 1.1 1.5 V
Logic pin input current IINL ST , OE , DM , MD1/DC11 , MD2/DC12 ,
FR/DC21 , STP/DC22 , RST , EMM , ATT1 ,
ATT2 ,VIN = 0.8V
38 15A
IINH VIN = 5V 30 50 70 A
Logic input
voltage
High VINh ST , OE , DM , MD1/DC11 , MD2/DC12 ,
FR/DC21 , STP/DC22 , RST , EMM , ATT1 ,
ATT2
2.0 VCC V
Low VINLl 0 0.8 V
Current
selection
reference
voltage level
Quarter step
resolution
Vtdac0_W Step 0(When initialized : channel 1
comparator level)
0.485 0.5 0.515 V
Vtdac1_W Step 1 (Initial state+1) 0.485 0.5 0.515 V
Vtdac2_W Step 2 (Initial state+2) 0.323 0.333 0.343 V
Vtdac3_W Step 3 (Initial state+3) 0.155 0.167 0.179 V
Half step
resolution
Vtdac0_H Step 0 (When initialized: channel 1
comparator level)
0.485 0.5 0.515 V
Vtdac2_H Step 2 (Initial state+1) 0.323 0.333 0.343 V
Half step
resolution
(full torque)
Vtdac0_HF Step 0 (Initial state, channel 1 comparator
level)
0.485 0.5 0.515 V
Vtdac2_HF Step 2 (Initial state+1) 0.485 0.5 0.515 V
Full step
resolution
Vtdac2_F Step 2 0.485 0.5 0.515 V
Chopping frequency Fchop RCHOP = 20k 45 62.5 75 kHz
Current setting reference voltage VRF00 ATT1 = L, ATT2 = L 0.485 0.5 0.515 V
VRF01 ATT1 = H, ATT2 = L 0.323 0.333 0.343 V
VRF10 ATT1 = L, ATT2 = H 0.237 0.25 0.263 V
VRF11 ATT1 = H, ATT2 = H 0.155 0.167 0.179 V
VREF pin input current Iref VREF = 1.5V -0.5 A
Charge pump
VREG5 output voltage Vreg5 IO = -1mA 4.5 5 5.5 V
VG output voltage VG 28 28.7 29.8 V
Rise time tONG VG = 0.1F , Between CP1-CP2 0.1uF
ST=”H”→VG = VM+4V
0.5 ms
Oscillator frequency Fosc RCHOP = 20k 90 125 150 kHz
Output short-circuit protection
EMO pin saturation voltage Iemo = 1mA 50 100 mV
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.
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Package Dimensions
unit : mm
SSOP44K (275mil) Exposed Pad
CASE 940AF
ISSUE A
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SOLDERING FOOTPRINT*
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor
Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
(Unit: mm)
7.00
0.32
1.00
0.65
(4.7)
(3.5)
XXXXX = Specific Device Code
Y = Year
M = Month
DDD = Additional Traceability Data
GENERIC
MARKING DIAGRAM*
XXXXXXXXXX
YMDDD
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Substrate Specifications (Substrate recommended for operation of LV8741V)
Size : 90mm × 90mm × 1.7mm (two-layer substrate [2S0P])
Material : Glass epoxy
Copper wiring density : L1 = 90% / L2 = 95%
L1 : Copper wiring pattern diagram L2 : Copper wiring pattern diagram
Cautions
1) The data for the case with the Exposed Die-Pad substrate mounted shows the values when 95% or more of the
Exposed Die-Pad is wet.
2) For the set design, employ the derating design with sufficient margin.
Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as
vibration, impact, and tension.
Accordingly, the design must ensure these stresses to be as low or small as possible.
The guideline for ordinary derating is shown below :
(1)Maximum value 80% or less for the voltage rating
(2)Maximum value 80% or less for the current rating
(3)Maximum value 80% or less for the temperature rating
3) After the set design, be sure to verify the design with the actual product.
Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die-Pad, etc.
Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction,
possibly resulting in thermal destruction of IC.
Pd max - Ta
0
1.0
2.0
2.05
4.0
3.0
2.90
1.51
1.07
40 60 80200100
*1 With components mounted on the exposed die-pad board
*2 With no components mounted on the exposed die-pad board
Two-layer circuit board 1 *1
Two-layer circuit board 2 *2
-20
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Pin Assignment
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
VMCP2
VGCP1
PGNDVCC
NCVREG5
GNDATT2
NCATT1
NCNC
OUT1
A
EMO
VM1CEM
RF1EMM
OUT1BRCHOP
OUT2
A
MONI
VM2RST
RF2STP/DC22
OUT2BFR/DC21
NCMD2/DC12
NCNC
GNDMD1/DC11
NCDM
NCOE
NCST
SGNDVREF
Top view
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Block Diagram
ATT1 ATT2 EMMDM
CEM
EMO
OERSTSTP/
DC22
FR/
DC21
MD2/
DC12
MD1/
DC11
RCHOP ST
TSD
LVS
VREF
VCC
GND
VREG5
MONI
VM
PGND
CP1CP2 VG RF1 OUT1A
OUT1B OUT2A
OUT2B RF2VM2VM1
+
-
+
-
+
-
+
-
+
-
Output preamplifier stage
Output preamplifier stage
Output preamplifier stage
Output preamplifier stage
Output control logic
Current set
(Full/Half/
Half full-torque/
Quarter)
Current set
(Full/Half/
Half full-torque/
Quarter)
Charge pump
Regulator
Oscillation
circuit
Attenuator
(4 levels
selectable)
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Pin Functions
Pin No. Pin name Description
36 VM1 Channel 1 motor power supply pin
37 OUT1A Channel 1 OUTA output pin
34 OUT1B Channel 1 OUTB output pin
35 RF1 Channel 1 current-sense resistor connection pin
32 VM2 Channel 2 motor power supply connection pin
33 OUT2A Channel 2 OUTA output pin
30 OUT2B Channel 2 OUTB output pin
31 RF2 Channel 2 current-sense resistor connection pin
42 PGND Power system ground
12 MONI Position detection monitor pin
14 STP/DC22 STM STEP signal input pin/DCM2 output control input pin
22 VREF Constant current control reference voltage input pin
18 MD1/DC11 STM excitation mode switching pin/DCM1 output control input pin
16 MD2/DC12 STM excitation mode switching pin/DCM1 output control input pin
13 RST Reset signal input pin
20 OE Output enable signal input pin
15 FR/DC21 STM forward/reverse rotation signal input pin/DCM2 output control input pin
6 ATT1 Motor holding current switching pin
5 ATT2 Motor holding current switching pin
21 ST Chip enable pin
44 VM Motor power supply connection pin
3 VCC Logic power supply connection pin
23 GND Signal system ground
11 RCHOP Chopping frequency setting resistor connection pin
19 DM Drive mode (STM/DCM) switching pin
4 VREG5 Internal power supply capacitor connection pin
2 CP1 Charge pump capacitor connection pin
1 CP2 Charge pump capacitor connection pin
43 VG Charge pump capacitor connection pin
8 EMO Output short-circuit state warning output pin
10 EMM Overcurrent mode switching pin
9 CEM Pin to connect the output short-circuit state detection time setting capacitor
27,40 GND Ground
7, 17, 24,
25, 26, 28,
29, 38, 39,
41
NC No Connection
(No internal connection to the IC)
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Equivalent Circuits
Pin No. Pin Equivalent Circuit
5
6
10
13
14
15
16
18
19
20
21
ATT2
ATT1
EMM
RST
STP/DC22
FR/DC21
MD2/DC12
MD1/DC11
DM
OE
ST
30
31
32
33
34
35
36
37
42
OUT2B
RF2
VM2
OUT2A
OUT1B
RF1
VM1
OUT1A
PGND
1
2
43
44
CP2
CP1
VG
VM
Continued on next page.
VCC
5kΩ
100kΩ
GND
32
36
3142
35
37 33 34 30
GND
VCC
100Ω
GND
VREG5
2 44 1 43
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Continued from preceding page.
Pin No. Pin Equivalent Circuit
22
VREF
4
VREG5
12
MONI
Continued on next page.
GND
VCC
500Ω
GND
VM
26kΩ
78kΩ
2kΩ
VCC
GND
500Ω
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Continued from preceding page.
Pin No. Pin Equivalent Circuit
8
EMO
9
CEM
11
RCHOP
VCC
GND
500Ω
VCC
GND
1kΩ
VCC
GND
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Description of operation
1. Input Pin Function
1-1) Chip enable function
This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to
power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not
operate in standby mode.
ST Mode Internal regulator Charge pump
Low or Open Standby mode Standby Standby
High Operating mode Operating Operating
1-2) Drive mode switching pin function
The IC drive mode is switched by setting the DM pin. In STM mode, stepper motor channel 1 can be controlled by the
CLK-IN input. In DCM mode, DC motor channel 2 or stepper motor channel 1 can be controlled by parallel input.
Stepper motor control using parallel input is Full-step or Half-step full torque.
DM Drive mode Application
Low or Open STM mode Stepper motor channel 1 (CLK-IN)
High DCM mode DC motor channel 2 or stepper motor channel 1 (parallel)
2.STM mode (DM = Low or Open)
2-1) STEP pin function
Input Operating mode
ST STP
Low * Standby mode
High
Excitation step proceeds
High
Excitation step is kept
2-2) Excitation mode setting function
MD1 MD2 Micro-step resolution
(Excitation mode)
Initial position
Channel 1 Channel 2
Low Low Full step (2 phase excitation) 100% -100%
High Low Half step (1-2 phase excitation)
full torque
100% 0%
Low High Half step (1-2 phase excitation) 100% 0%
High High Quarter step
(W1-2 phase excitation)
100% 0%
This is the initial position of each excitation mode in the initial state after power-on and when the counter is reset.
2-3) Constant-current control reference voltage setting function
ATT1 ATT2 Current setting reference voltage
Low Low VREF/3100%
High Low VREF/367%
Low High VREF/350%
High High VREF/333%
The voltage input to the VREF pin can be switched to four-step settings as the reference voltage for setting the output current. This is effective for
reducing power consumption when motor holding current is supplied.
Set current value calculation method
The reference voltage is set by the voltage applied to the VREF pin and the two inputs ATT1 and ATT2. The output
current (output current at a constant-current drive current ratio of 100%) can be set from this reference voltage and the
RF resistance value.
IOUT = (VREF/3 Voltage setting ratio)/RF resistor
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(Example) When VREF = 0.66V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RF resistor =
0.22, the following output current flows :
IOUT = 0.66V/3 100%/0.22 = 1A
2-4) Input Timming
TstepH/TstepL : Clock H/L pulse width (min 500ns)
Tds : Data set-up time (min 500ns)
Tdh : Data hold time (min 500ns)
2-5) Blanking period
If, when exercising PWM constant-current chopping control over the motor current, the mode is switched from decay
to charge, the recovery current of the parasitic diode may flow to the current sensing resistance, causing noise to be
carried on the current sensing resistance pin, and this may result in erroneous detection. To prevent this erroneous
detection, a blanking period is provided to prevent the noise occurring during mode switching from being received.
During this period, the mode is not switched from charge to decay even if noise is carried on the current sensing
resistance pin. In the blanking time for this IC, it is fixed one sixteenth of chopping cycle.
2-6) Reset function
RST Operating mode
High Normal operation
Low Reset state
When the RST pin is set Low, the output excitation position is forced to the initial state, and the MONI output also
goes Low.
When RST is set High after that, the excitation position proceeds to the next STEP input.
RST RESET
0%
STEP
MONI
1ch output
2ch output
Initial state
STEP
MD1
MD2
FR
TstepH TstepL
Tds
(md1 step)
Tdh
(step md1)
Tds
(md2 step)
Tdh
(step md2)
Tds
(fr step)
Tdh
(step fr)
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2-7) Output enable function
OE Operating mode
Low Output OFF
High Output ON
When the OE pin is set Low, the output is forced OFF and goes to high impedance.
However, the internal logic circuits are operating, so the excitation position proceeds when the STEP signal is input.
Therefore, when OE is returned to High, the output level conforms to the excitation position proceeded by the STEP
input.
2-8) Forward/reverse switching function
FR Operating mode
Low Clockwise (CW)
High Counter-clockwise (CCW)
The internal D/A converter proceeds by one bit at the rising edge of the input STEP pulse.
In addition, CW and CCW mode are switched by setting the FR pin.
In CW mode, the channel 2 current phase is delayed by 90° relative to the channel 1 current.
In CCW mode, the channel 2 current phase is advanced by 90° relative to the channel 1 current.
OE Power save mode
0%
STEP
MONI
1ch output
2ch output
Output is high-impedance
FR CW mode CW modeCCW mode
STEP
Excitation position
1ch output
2ch output
(1) (2) (3) (4) (5) (6) (5) (4) (3) (4) (5)
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2-9) Setting the chopping frequency
For constant-current control, chopping operation is made with the frequency determined by the external resistor
(connected to the RCHOP pin).
The chopping frequency to be set with the resistance connected to the RCHOP pin (pin 11) is as shown below.
PCA01883
0
20
40
60
80
100
03020 4010 50 60
RCHOP – kΩ
Fchop – kHz
Chopping frequency settings (reference data)
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2-10) Output current vector locus (one step is normalized to 90 degrees)
Setting current ration in each micro-step mode
STEP Quarter-step (%) Half-step (%) Half-step full torque (%) Full-step (%)
Channel 1 Channel 2 Channel 1 Channel 2 Channel 1 Channel 2 Channel 1 Channel 2
0 0 100 0 100 0 100
1 33.3 100
2 66.7 66.7 66.7 66.7 100 100 100 100
3 100 33.3
4 100 0 100 0 100 0
0.0
33.3
66.7
100.0
0.0 33.3 66.7 100.0
Channel 2 current ratio (%)
θ2 (Full-step/
Half-step
full torque)
θ 0
θ 1
θ 2
θ 3
θ 4
Channel 1 phase current ratio (%)
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2-11) Examples of current waveform in each micro-step mode
Full step (CW mode)
Half step full torque (CW mode)
STEP
MONI
l1
(%)
(%)
-100
-100
100
100
0
0
I2
STEP
MONI
I1
(%)
(%)
-100
-100
100
100
0
0
I2
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Half step (CW mode)
Quarter step (CW mode)
STEP
MONI
I1
(%)
-100
-100
100
(%)
100
0
0
I2
STEP
MONI
I1
(%)
-100
-100
100
(%)
100
0
0
I2
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FASTSLOWCHARGEFASTSLOWCHARGECurrent mode
fchop
Coil current
STEP
Set current
Set current
Forced CHARGE
section
Forced CHARGE
section
FAST SLOWFASTSLOWCHARGECurrent mode
fchop
Coil current
STEP
Set current
Set current
Forced CHARGE
section
CHARGE
2-12) Current control operation specification
(Sine wave increasing direction)
(Sine wave decreasing direction)
In each current mode, the operation sequence is as described below :
At rise of chopping frequency, the CHARGE mode begins.(The section in which the CHARGE mode is forced
regardless of the magnitude of the coil current (ICOIL) and set current (IREF) exists for 1/16 of one chopping cycle.)
The coil current (ICOIL) and set current (IREF) are compared in this forced CHARGE section.
When (ICOIL<IREF) state exists in the forced CHARGE section ;
CHARGE mode up to ICOIL IREF, then followed by changeover to the SLOW DECAY mode, and finally
by the FAST DECAY mode for the 1/16 portion of one chopping cycle.
When (ICOIL<IREF) state does not exist in the forced CHARGE section;
The FAST DECAY mode begins. The coil current is attenuated in the FAST DECAY mode till one cycle of
chopping is over.
Above operations are repeated. Normally, the SLOW (+FAST) DECAY mode continues in the sine wave increasing
direction, then entering the FAST DECAY mode till the current is attenuated to the set level and followed by the SLOW
DECAY mode.
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3.DCM Mode (DM-High)
3-1) DCM mode output control logic
Parallel input Output Mode
DC11 (21) DC12 (22) OUT1 (2) A OUT1 (2) B
Low Low OFF OFF Standby
High Low High Low CW (Forward)
Low High Low High CCW (Reverse)
High High Low Low Brake
3-2) Reset function
RST Operating mode MONI
High or Low Reset operation not performed High output
The reset function does not operate in DCM mode. In addition, the MONI output is High, regardless of the RST pin
state.
3-3) Output enable function
OE Operating mode
Low Output OFF
High Output ON
When the OE pin is set Low, the output is forced OFF and goes to high impedance. When the OE pin is set High,
output conforms to the control logic.
3-4) Current limit control time chart
3-5) Current limit reference voltage setting function
ATT1 ATT2 Current setting reference voltage
Low Low VREF/3100%
High Low VREF/367%
Low High VREF/350%
High High VREF/333%
The voltage input to the VREF pin can be switched to four-step settings as the reference voltage for setting the current limit.
Set current calculation method
The reference voltage is set by the voltage applied to the VREF pin and the two inputs ATT1 and ATT2. The current
limit can be set from this reference voltage and the RF resistance value.
Ilimit = (VREF/3 Current setting ratio) /RF resistance
(Example) When VREF = 0.66V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RNF1 (2) = 0.22,
the current limit value is as follows :
Ilimit = 0.66V/3 100%/0.22 = 1A
CHARGE
fchop
Forced CHARGE
section
Coil current
Set current
Current mode SLOW
Current mode
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3-6) Examples of current waveform in each micro-step mode when stepper motor parallel input control
Full step (CW mode)
Half step full torque (CW mode)
DC11
DC12
DC21
DC22
lOUT1
lOUT2
(%)
-100
-100
100
(%)
100
0
0
DC11
DC12
DC21
DC22
l1
l2
-100
-100
0
0
(%)
100
(%)
100
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4.Output short-circuit protection circuit
To protect the IC from damage due to short-circuit of the output caused by lightening or ground fault, the output
short-circuit protection circuit to put the output in standby mode and turn on the alarm output is incorporated. Note
that when the RF pin is short-circuited to GND, this output short-circuit protection is not effective against shorting to
power.
4-1) Output short-circuit protection mode switching function
Output short-circuit protection mode of IC can be switched by the setting of EMM pin.
EMM State
Low or Open Auto reset method
High Latch method
4-2) Auto reset method
When the output current is below the output short-circuit protection current, the output is controlled by the input
signal. When the output current exceeds the detection current, the switching waveform as shown below appears
instead.
(When a 20k resistor is inserted between RCHOP and GND)
When detecting the output short-circuit state, the short-circuit detection circuit is activated.
When the short-circuit detection circuit operation exceeds the timer latch time described later, the output is changed
over to the standby mode and reset to the ON mode again in 256s (TYP). In this event, if the overcurrent mode still
continues, the above switching mode is repeated till the overcurrent mode is canceled.
4-3) Latch method
Similarly to the case of automatic reset method, the short-circuit detection circuit is activated when it detects the
output short-circuit state.
When the short-circuit detection circuit operation exceeds the timer latch time described later, the output is changed
over to the standby mode.
In this method, latch is released by setting ST = “L”
4-4) Output short-circuit condition warning output pin
EMO, warning output pin of the output short-circuit protection circuit, is an open-drain output.
EMO outputs ON when output short-circuit is detected.
ON
1V
OFF
1 to 2μs
Tscp
256μs (TYP)
OFFON ON
OCP voltage
Output current
Exceeding the
over-current
detection
current
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24
4-5) Timer latch time (Tscp)
The time to output OFF when an output short-circuit occurs can be set by the capacitor connected between the CEM
pin and GND. The capacitor (C) value can be determined as follows :
Timer latch : Tscp Tscp Td+C V/I [sec]
Td : Internal delay time TYP 4s
V : Threshold voltage of comparator TYP 1V
I : CEM charge current TYP 2.5A
The Tscp time must be set so as not to exceed 80% of the chopping period.
The CEN pin must be connected to (S) GND when the output short protection funtion is not to be used.
5.Charge Pump Circuit
When the ST pin is set High, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage
to the VM + VREG5 voltage. If the VG pin voltage is not boosted sufficiently, the output cannot be controlled, so be
sure to provide a wait time of tONG or more after setting the ST pin High before starting to drive the motor.
VG Pin Voltage Schematic View
When controlling the stepping motor driver with the CLK-IN input, set the ST pin High, wait for the tONG time
duration or longer, and then set the OE pin High. In addition, when controlling the stepping motor and DC motor
driver with parallel input, set the ST pin High, wait for the tONG time duration or longer, and then start the control for
each channel.
6.Thermal shutdown function
The thermal shutdown circuit is included, and the output is turned off when junction temperature Tj exceeds 180°C
and the abnormal state warning output is turned on at the same time.
When the temperature falls hysteresis level, output is driven again (automatic restoration)
The thermal shutdown circuit doesn’t guarantee protection of the set and the destruction prevention of IC, because it
works at the temperature that is higher than rating (Tjmax=150°C) of the junction temperature
TTSD = 180°C (typ)
ΔTSD = 40°C (typ)
tONG
ST
OE (STM mode)
DC11, DC12, DC21 and DC22
(DCM mode)
VM+VREG5
VM+4V
VM
VG pin voltage
High after the tONG wait time has elapsed
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25
7.Recommended Po wer-on Sequence
Provide a wait time of 10s or more after the VCC power supply rises before supplying the motor power supply.
Provide a wait time of 10s or more after the motor power supply rises before setting the ST pin High.
The above power-on sequence is only a recommendation, and there is no risk of damage to the IC even if this
sequence is not followed.
Notes on Board Design Layout
Use thick GND lines and connect to GND stabilization points by the shortest distance possible to lower the
impedance.
Use thick VM, VM1 and VM2 lines, and short-circuit these lines to each other by a short distance.
Place the capacitors connected to VCC and VM as close to the IC as possible, and connect each capacitor to a
separate GND stabilization point using a thick independent line.
Place the RF resistor as near to the IC as possible, and connect it to the GND stabilization point using a thick
independent line.
When thermal radiation is necessary for the exposed die-pad on the bottom of the IC, solder it to GND. Also, do not
connect the exposed die-pad to other than GND.
ST
VM
VCC 10μs or longer
10μs or longer
LV8741V
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Application Circuits
Stepper motor driver application circuit example
The setting conditions for the above circuit diagram example are as follows :
Auto recovery-type output short-circuit protection function (EMM = High)
Reset function fixed to normal operation (RST = High)
Chopping frequency : 37kHz (RCHOP = 43k)
ATT1 ATT2 Current setting reference voltage
L L VREF/3×100%
H L VREF/3×67%
L H VREF/3×50%
H H VREF/3×33%
At the time of VREF = 0.66V, setting electric current ratio 100% [(ATT1, ATT2) =(L,L)], RF resistance 0.22,
the set current value is as follows.
IOUT = (VREF/3 Voltage setting ratio) /0.22
= (0.66/3 100 % / 0.22) = 1A
0.1μF
CP2
CP1
VREG5
ATT2
ATT1
NC
EMO
CEM
EMM
RCHOP
MONI
RST
STP/DC22
FR/DC21
MD2/DC12
MD1/DC11
DM
OE
ST
VREF
NC
VCC
VM
VG
NC
GND
NC
NC
OUT1A
VM1
RF1
OUT1B
OUT2A
VM2
RF2
OUT2B
NC
GND
NC
NC
NC
GND
NC
PGND
5V
0.1μF
Position detection monitor
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
LV8741V
-+
+-
0.1μF
0.22Ω
43kΩ
0.22Ω
M
10μF
0.66V
+-
Clock input
Logic input
Short-circuit state
detection monitor
47kΩ
24V
LV8741V
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DC motor driver application circuit example
The setting conditions for the above circuit diagram example are as follows :
At the time of VREF = 0.66V, setting electric current ratio 100% [(ATT1, ATT2) =(L,L)], RF resistance 0.22,
the current limit value is as follows .
IOUT = (VREF/3 Voltage setting ratio) /0.22
= (0.66/3 100 % / 0.22) = 1A
Auto recovery-type output short-circuit protection function (EMM = High)
Chopping frequency : 62.5kHz (RCHOP = 20k)
0.1μF
VREG5
ATT2
ATT1
NC
EMO
CEM
EMM
RCHOP
MONI
RST
STP/DC22
FR/DC21
MD2/DC12
MD1/DC11
DM
OE
ST
VREF
NC
VCC
VM
VG
NC
GND
NC
NC
OUT1A
VM1
RF1
OUT1B
OUT2A
VM2
RF2
OUT2B
NC
GND
NC
NC
NC
GND
NC
PGND
5V
0.1μF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
LV8741V
-
+
+-
0.1μF
0.22Ω
47kΩ
20kΩ
0.22Ω
M
10μF
M
0.66V
+-
CP2
CP1
24V
Sort-circuit state
detection monitor
Logic input
LV8741V
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ORDERING INFORMATION
Device Package Shipping (Qty / Packing)
LV8741V-TLM-E SSOP44K (275mil)
(Pb-Free) 2000 / Tape & Reel
† For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel
Packaging Specifications Brochure, BRD8011/D. http://www.onsemi.com/pub_link/Collateral/BRD8011-D.PDF
