SANYO LV8741V_0712

Ordering number : ENA0814B
Bi-CMOS LSI
LV8741V
PWM Current Control Stepping
Motor Driver
Overview
The LV8741V is a PWM current-control stepping motor driver IC.
Features
• Single-channel PWM current control stepping motor driver (selectable with DC motor driver channel 2) incorporated.
• BiCDMOS process IC
• On resistance (upper side : 0.5Ω ; lower side : 0.5Ω ; total of upper and lower : 1.0Ω ; Ta = 25°C, IO = 1.5A)
• Excitation mode can be set to 2-phase, 1-2 phase full torque, 1-2 phase or W1-2 phase
• Excitation step proceeds only by step signal input
• Motor holding current selectable in four steps
• IO max = 1.5A
• Output-stage push-pull structure enabling high-speed operation
• Output short-circuit protection circuit (selectable from latch-type or auto reset-type) incorporated
• Thermal shutdown circuit and power supply monitor circuit incorporated
• Supports control power supply VCC = 3.3V
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage 1
VM max
38
V
Supply voltage 2
VCC max
6
V
Output peak current
IO peak
Output current
IO max
tw ≤ 10ms, duty 20%
1.75
A
1.5
A
Logic input voltage
VIN
-0.3 to VCC+0.3
V
EMO input voltage
VEMO
-0.3 to VCC+0.3
V
Continued on next page.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer' s products or
equipment.
10908 MS PC 20071217-S00001 / 90507 MS PC / 61307 MS PC 20070411-S00007 No.A0814-1/25
LV8741V
Continued from preceding page.
Parameter
Symbol
Conditions
Allowable power dissipation 1
Pd max1
Independent IC
Allowable power dissipation 2
Pd max2
* Our recommended two-layer substrate *1, *2
Operating temperature
Storage temperature
*1 Specified circuit board :
90×90×1.7mm3
Ratings
Unit
0.55
W
2.9
W
Topr
-20 to +85
°C
Tstg
-55 to +150
°C
: glass epoxy printed circuit board
*2 For mounting to the backside by soldering, refer the precautions.
Recommended Operating Conditions at Ta = 25°C
Parameter
Supply voltage range 1
Symbol
Conditions
Ratings
VM
Unit
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
Electrical Characteristics at Ta = 25°C, VM = 24V, VCC = 5V, VREF = 1.5V
Parameter
Symbol
Ratings
Conditions
min
Standby mode current drain 1
Current drain 1
IMstn
IM
Standby mode current drain 2
Current drain 2
ICCstn
ICC
typ
Unit
max
ST = ”L”
150
200
µA
mA
ST = ”H”, OE = ”H”, no load
0.75
1
ST = ”L”
110
160
µA
ST = ”H”, OE = ”H”, no load
2.5
3
mA
2.2
2.35
2.5
V
100
150
200
mV
VCC low-voltage cutoff voltage
VthVCC
Low-voltage hysteresis voltage
VthHIS
Thermal shutdown temperature
TSD
Design guarantee
180
°C
∆TSD
Design guarantee
40
°C
Thermal hysteresis width
Output on-resistance
Ronu
IO = 1.5A, Upper-side on resistance
0.5
0.7
Ω
Rond
IO = 1.5A, Lower-side on resistance
0.5
0.6
Ω
Output leakage current
IOleak
50
µA
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
IINL
VIN = 0.8V
3
8
15
µA
IINH
VIN = 5V
30
50
70
µA
Logic pin input current
Logic high-level input voltage
VINH
Logic low-level input voltage
VINL
2.0
Current
W1-2-phase
Step 0(When initialized : channel 1
selection
drive
comparator level)
V
0.8
V
0.485
0.5
0.515
V
0.485
0.5
0.515
V
reference
Step 1 (Initial state+1)
voltage level
Step 2 (Initial state+2)
0.323
0.333
0.343
V
Step 3 (Initial state+3)
0.155
0.167
0.179
V
Step 0 (When initialized: channel 1
0.485
0.5
0.515
V
1-2 phase drive
comparator level)
Step 2 (Initial state+1)
0.323
0.333
0.343
V
1-2 phase (full
Step 0 (Initial state, channel 1 comparator
0.485
0.5
0.515
V
torque) drive
level)
Step 2 (Initial state+1)
0.485
0.5
0.515
V
Step 2
0.485
0.5
0.515
V
2 phase drive
Chopping frequency
Fchop
RCHOP = 20kΩ
45
62.5
75
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
kHz
µA
Continued on next page.
No.A0814-2/25
LV8741V
Continued from preceding page.
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
Charge pump
VREG5 output voltage
Vreg5
VG output voltage
IO = -1mA
VG
Rise time
tONG
VG = 0.1µF
Oscillator frequency
Fosc
RCHOP = 20kΩ
4.5
5
5.5
V
28
28.7
29.8
V
0.5
ms
90
125
150
kHz
50
100
mV
Output short-circuit protection
EMO pin saturation voltage
Iemo = 1mA
Package Dimensions
unit : mm (typ)
3333
TOP VIEW
SIDE VIEW
BOTTOM VIEW
15.0
44
23
(3.5)
0.5
5.6
7.6
(4.7)
0.22
22
0.2
1.7MAX
0.65
SIDE VIEW
0.1 (1.5)
1
(0.68)
SANYO : SSOP44K(275mil)
No.A0814-3/25
LV8741V
Pd max – Ta
Allowable power dissipation, Pd max – W
4.0
3.0
*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
2.90
Two-layer circuit board 2 *2
2.0
2.05
1.51
1.07
1.0
0
– 20
0
20
40
60
80
100
Ambient temperature, Ta – °C
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.
No.A0814-4/25
LV8741V
Pin Assignment
CP2 1
44 VM
CP1 2
43 VG
VCC 3
42 PGND
VREG5 4
41 NC
ATT2 5
40 GND
ATT1 6
39 NC
NC 7
38 NC
EMO 8
37 OUT1A
CEM 9
36 VM1
EMM 10
35 RF1
RCHOP 11
34 OUT1B
LV8741V
MONI 12
33 OUT2A
RST 13
32 VM2
STP/DC22 14
31 RF2
FR/DC21 15
30 OUT2B
MD2/DC12 16
29 NC
NC 17
28 NC
MD1/DC11 18
27 GND
DM 19
26 NC
OE 20
25 NC
ST 21
24 NC
VREF 22
23 SGND
Top view
No.A0814-5/25
MONI
PGND
+
-
SGND
VCC
VREF
VREG5
+
-
VM
LVS
TSD
+
-
RCHOP
Oscillation
circuit
Regulator
ATT2
Attenuator
(4 levels
selectable)
ST ATT1
Charge pump
Output preamplifier stage
RF1
OUT1B VM1
VM2 OUT2A
MD1/ MD2/ FR/ STP/ RST OE
DC11 DC12 DC21 DC22
DM
Current
selection
(W1-2/1-2/
1-2Full/2)
Current
selection
(W1-2/1-2/
1-2Full/2)
EMM
RF2
+
Output control logic
OUT2B
+
OUT1A
Output preamplifier stage
VG
Output preamplifier stage
CP1
Output preamplifier stage
CP2
CEM
EMO
LV8741V
Block Diagram
No.A0814-6/25
LV8741V
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
SGND
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,
NC
No Connection
(No internal connection to the IC)
29, 38, 39,
41
No.A0814-7/25
LV8741V
Equivalent Circuits
Pin No.
Pin
5
ATT2
6
ATT1
10
EMM
13
RST
14
STP/DC22
15
FR/DC21
16
MD2/DC12
18
MD1/DC11
19
DM
20
OE
21
ST
Equivalent Circuit
VCC
5kΩ
100kΩ
GND
30
OUT2B
31
RF2
36
32
VM2
32
33
OUT2A
34
OUT1B
35
RF1
36
VM1
37
OUT1A
42
PGND
VCC
37 33
34 30
35
GND
42
1
CP2
2
CP1
43
VG
44
VM
2
VREG5
31
44
1
43
100Ω
GND
Continued on next page.
No.A0814-8/25
LV8741V
Continued from preceding page.
Pin No.
22
Pin
VREF
Equivalent Circuit
VCC
500Ω
GND
4
VREG5
VM
2kΩ
78kΩ
26kΩ
GND
12
MONI
VCC
500Ω
GND
Continued on next page.
No.A0814-9/25
LV8741V
Continued from preceding page.
Pin No.
8
Pin
Equivalent Circuit
EMO
VCC
GND
9
CEM
VCC
500Ω
GND
11
RCHOP
VCC
GND
1kΩ
No.A0814-10/25
LV8741V
Input Pin Function
(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
(2) Drive mode switching pin function
The IC drive mode is switched by setting the DM pin. In STM mode, stepping motor channel 1 can be controlled by
the CLK-IN input. In DCM mode, DC motor channel 2 or stepping motor channel 1 can be controlled by parallel
input. Stepping motor control using parallel input is 2-phase or 1-2 phase full torque.
DM
Drive mode
Application
Low or Open
STM mode
Stepping motor channel 1 (CLK-IN)
High
DCM mode
DC motor channel 2 or stepping motor channel 1 (parallel)
STM mode (DM = Low or Open)
(1) STEP pin function
Operating mode
Input
ST
STP
Low
*
Standby mode
High
Excitation step proceeds
High
Excitation step is kept
(2) Excitation mode setting function
MD1
Low
MD2
Low
Excitation mode
2 phase excitation
Initial position
Channel 1
Channel 2
100%
-100%
High
Low
1-2 phase excitation (full torque)
100%
0%
Low
High
1-2 phase excitation
100%
0%
High
High
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.
(3) Constant-current control reference voltage setting function
ATT1
ATT2
Current setting reference voltage
VREF/3×100%
Low
Low
High
Low
VREF/3×67%
Low
High
VREF/3×50%
High
High
VREF/3×33%
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
(Example) When VREF = 1.5V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RF resistor = 0.5Ω,
the following output current flows :
IOUT = 1.5V/3 × 100%/0.5Ω = 1A
No.A0814-11/25
LV8741V
(4) Reset function
RST
Operating mode
High
Normal operation
Low
Reset state
RESET
RST
STEP
MONI
1ch output
0%
2ch output
Initial 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.
(5) Output enable function
OE
Operating mode
Low
Output OFF
High
Output ON
OE
Power save mode
STEP
MONI
1ch output
0%
2ch output
Output is high-impedance
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.
No.A0814-12/25
LV8741V
(6) Forward/reverse switching function
FR
Operating mode
Low
Clockwise (CW)
High
Counter-clockwise (CCW)
FR
CW mode
CCW mode
CW mode
STEP
Excitation position
(1)
(2)
(3)
(4)
(5)
(6)
(5)
(4)
(3)
(4)
(5)
1ch output
2ch output
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.
(7) 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.
Chopping frequency settings (reference data)
100
Fchop – kHz
80
60
40
20
0
0
10
20
30
RCHOP – kΩ
40
50
60
PCA01883
No.A0814-13/25
LV8741V
(8) Output current vector locus (one step is normalized to 90 degrees)
100.0
θ2 (2-phase/
1-2 phase
full torque)
θ4
Channel 1 phase current ratio (%)
θ3
66.7
θ2
33.3
θ1
θ0
0.0
0.0
33.3
66.7
100.0
Channel 2 current ratio (%)
Setting current ration in each excitation mode
STEP
W1-2 phase (%)
Channel 1
1-2 phase (%)
Channel 2
Channel 1
θ0
0
100
θ1
33.3
100
θ2
66.7
66.7
θ3
100
33.3
θ4
100
0
1-2 phase full torque (%)
Channel 2
Channel 1
2-phase (%)
Channel 2
Channel 1
0
100
0
100
66.7
66.7
100
100
100
0
100
0
100
Channel 2
100
No.A0814-14/25
LV8741V
(9) Typical current waveform in each excitation mode
2-phase excitation (CW mode)
STEP
MONI
(%)
100
l1
0
-100
(%)
100
I2
0
-100
1-2 phase excitation full torque (CW mode)
STEP
MONI
(%)
100
I1
0
-100
(%)
100
I2
0
-100
No.A0814-15/25
LV8741V
1-2 phase excitation (CW mode)
STEP
MONI
(%)
100
I1
0
-100
(%)
100
I2
0
-100
W1-2 phase excitation (CW mode)
STEP
MONI
(%)
100
I1
0
-100
(%)
100
I2
0
-100
No.A0814-16/25
LV8741V
(10) Current control operation specification
(Sine wave increasing direction)
STEP
Set current
Set current
Coil current
Forced CHARGE
section
fchop
Current mode CHARGE
SLOW
FAST
CHARGE
SLOW
FAST
(Sine wave decreasing direction)
STEP
Set current
Coil current
Forced CHARGE
section
Set current
fchop
Current mode CHARGE
SLOW
FAST
Forced CHARGE
section
FAST
CHARGE
SLOW
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.
No.A0814-17/25
LV8741V
DCM Mode (DM-High)
(1) DCM mode output control logic
Parallel input
Mode
Output
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
(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) 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.
(4) Current limit control time chart
Set current
Current mode
Coil current
Forced CHARGE
section
fchop
Current mode
CHARGE
SLOW
(5) Current limit reference voltage setting function
ATT1
ATT2
Current setting reference voltage
Low
Low
VREF/3×100%
High
Low
VREF/3×67%
Low
High
VREF/3×50%
High
High
VREF/3×33%
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 = 1.5V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RNF1 (2) = 0.5Ω,
the current limit value is as follows :
Ilimit = 1.5V/3 × 100%/0.5Ω = 1A
No.A0814-18/25
LV8741V
(6) Typical current waveform in each excitation mode when stepping motor parallel input control
2-phase excitation (CW mode)
DC11
DC12
DC21
DC22
(%)
100
lOUT1
0
-100
(%)
100
lOUT2
0
-100
1-2 phase excitation full torque (CW mode)
DC11
DC21
DC12
DC22
(%)
100
l1
0
-100
(%)
100
l2
0
-100
No.A0814-19/25
LV8741V
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.
(1) Output short-circuit protection operation changeover function
Changeover to the output short-circuit protection of IC is made by the setting of OCPM pin.
EMM
State
Low or Open
Auto reset method
High
Latch method
(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 20kΩ resistor is inserted between RCHOP and GND)
Exceeding the
over-current
detection
current
ON
OFF
ON
OFF
ON
Output current
1V
OCP voltage
Tscp
1 to 2µs
256µs (TYP)
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 256µs (TYP). In this event, if the overcurrent mode still
continues, the above switching mode is repeated till the overcurrent mode is canceled.
(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 PS = “L”
(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.
No.A0814-20/25
LV8741V
(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 :
Tscp ≈ Td+C × V/I [sec]
Td : Internal delay time TYP 4µs
V : Threshold voltage of comparator TYP 1V
I : CEM charge current TYP 2.5µA
Timer latch : Tscp
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.
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.
ST
VG pin voltage
VM+VREG5
VM+4V
VM
tONG
OE (STM mode)
DC11, DC12, DC21 and DC22
(DCM mode)
High after the tONG wait time has elapsed
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.
No.A0814-21/25
LV8741V
Recommended Power-on Sequence
Provide a wait time of 10µs or more after the VCC power supply rises before supplying the motor power supply.
Provide a wait time of 10µs or more after the motor power supply rises before setting the ST pin High.
VCC
10µs or longer
VM
10µs or longer
ST
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.
No.A0814-22/25
LV8741V
Application Circuits
• Stepping motor driver application circuit example
0.1µF
1 CP2
VM 44
2 CP1
VG 43
3 VCC
PGND 42
0.1µF
0.1µF
- +
Logic input
4 VREG5
0.1µF
10µF
+ + -
20kΩ
5 ATT2
GND 40
6 ATT1
NC 39
7 NC
NC 38
OUT1A 37
9 CEM
VM1 36
10 EMM
RF1 35
Logic input
12 MONI
LV8741V
8 EMO
11 RCHOP
43kΩ
NC 41
0.25Ω
OUT1B 34
OUT2A 33
13 RST
VM2 32
14 STP/DC22
RF2 31
15 FR/DC21
M
0.25Ω
OUT2B 30
16 MD2/DC12
NC 29
17 NC
NC 28
18 MD1/DC11
GND 27
19 DM
NC 26
20 OE
NC 25
21 ST
NC 24
Logic input
- +
22 VREF
GND 23
0.1µF
The setting conditions for the above circuit diagram example are as follows :
• 2-phase excitation (MD1/DC11 = Low, MD2/DC12 = Low)
• Auto recovery-type output short-circuit protection function (EMM = Low)
• Reset function fixed to normal operation (RST = High)
• Chopping frequency : 37kHz (RCHOP = 43kΩ)
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%
The set current value is as follows :
IOUT = (VREF/3 × Voltage setting ratio) /0.25Ω
No.A0814-23/25
LV8741V
• DC motor driver application circuit example
0.1µF
1 CP2
VM 44
2 CP1
VG 43
3 VCC
PGND 42
10µF
+ + -
0.1µF
0.1µF
- +
4 VREG5
NC 41
0.1µF
43kΩ
Logic input
- +
GND 40
6 ATT1
NC 39
7 NC
NC 38
8 EMO
OUT1A 37
9 CEM
VM1 36
10 EMM
RF1 35
11 RCHOP
12 MONI
LV8741V
1ch
2ch
control logic inputs control logic inputs
20kΩ
5 ATT2
14 STP/DC22
RF2 31
2ch
DC motor
0.25Ω
OUT2B 30
16 MD2/DC12
NC 29
17 NC
NC 28
GND 27
19 DM
NC 26
20 OE
NC 25
21 ST
NC 24
22 VREF
M
0.25Ω
OUT2A 33
VM2 32
18 MD1/DC11
1ch
DC motor
OUT1B 34
13 RST
15 FR/DC21
M
GND 23
0.1µF
The setting conditions for the above circuit diagram example are as follows :
• Auto recovery-type output short-circuit protection function (EMM = Low)
• Output enable function fixed to output ON state (OE = High)
• Current limit reference voltage setting = 100% (ATT1 = Low, ATT2 = Low)
• Chopping frequency : 37kHz (RCHOP = 43kΩ)
The current limit value is as follows :
Ilimit = (VREF/3) /0.25Ω
No.A0814-24/25
LV8741V
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of January, 2008. Specifications and information herein are subject
to change without notice.
PS No.A0814-25/25