SANYO LV8736LF

Ordering number : ENA1987
Bi-CMOS LSI
LV8736LF
PWM Constant-Current Control
Stepping Motor Driver
Overview
The LV8736LF is a 2-channel H-bridge driver IC that can switch a stepping motor driver, which is capable of micro-step
drive and supports 2W 1-2 phase 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 stepping motors used in office
equipment and amusement applications.
Features
• Single-channel PWM current control stepping motor driver (selectable with DC motor driver channel 2) incorporated.
• BiCDMOS process IC
• Low on resistance (upper side : 0.75Ω ; lower side : 0.5Ω ; total of upper and lower : 1.25Ω ; Ta = 25°C, IO = 1A)
• Excitation mode can be set to 2-phase, 1-2 phase, W1-2 phase , or 2W1-2 phase
• Excitation step proceeds only by step signal input
• Motor current selectable in four steps
• Output short-circuit protection circuit (selectable from latch-type or auto-reset-type) incorporated
• Unusual condition warning output pins
• Built-in thermal shutdown circuit
• No control power supply required
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Supply voltage
VM max
Output peak current
IO peak
Output current
IO max
Logic input voltage
MONI/EMO input voltage
Conditions
Ratings
Unit
36
tw ≤ 10ms, duty 20%
V
1.5
A
1
A
VIN max
-0.3 to +6
V
Vmo/Vemo
-0.3 to +6
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. 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 new introduction or other application different
from current conditions on the usage of automotive device, communication device, office equipment, industrial
equipment etc. , please consult with us about usage condition (temperature, operation time etc.) 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.
O1911 SY 20110928-S00001 No.A1987-1/26
LV8736LF
Continued from preceding page.
Parameter
Symbol
Allowable power dissipation
Pd max
Operating temperature
Storage temperature
Conditions
Ratings
Unit
*
2.75
W
Topr
-20 to +85
°C
Tstg
-55 to +150
°C
* Specified circuit board : 57.0mm×57.0mm×1.6mm, glass epoxy 4-layer board, with backside 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.
Allowable Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage range
VM
9 to 32
V
Logic input voltage
VIN
0 to 5.5
V
VREF input voltage range
VREF
0 to 3
V
Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V
Ratings
Parameter
Symbol
Conditions
Unit
min
typ
max
100
400
μA
3.2
5
mA
Standby mode current drain
IMst
ST = “L”
Current drain
IM
ST = “H”, OE = “L”, with no load
VREG5 output voltage
Vreg5
IO = -1mA
4.5
5
5.5
V
Thermal shutdown temperature
TSD
Design guarantee
150
180
200
°C
Thermal hysteresis width
ΔTSD
Design guarantee
Ronu
IO = 1A, Upper-side on resistance
0.75
0.97
Ω
Rond
IO = 1A, Lower-side on resistance
0.5
0.65
Ω
50
μA
ID = -1A
1.2
1.4
V
°C
40
Motor driver
Output on resistance
Output leakage current
IOleak
Diode forward voltage
VD
Logic high-level input voltage
VINH
Logic low-level input voltage
VINL
Logic pin input current
IINL
VIN = 0.8V
other OE/CMK pin
IINH
VIN = 5V
ICMKL
DM = “L”, OE/CMK = 0.8V
ICMKH
DM = “L”, OE/CMK = 5V
OE / CMK pin input current
OE/CMK pin current LIMIT mask
2.0
V
0.8
V
4
8
12
μA
30
50
70
μA
4
8
12
μA
30
50
70
μA
ICMK
DM = “H”, OE/CMK = 0V
-32
-25
-18
μA
VtCMK
DM = “H”
1.2
1.5
1.8
V
Vtdac0_2W
Step 0 (When initialized : channel 1
0.291
0.3
0.309
V
threshold voltage.
Current setting
2W1-2 phase
comparator
drive
comparator level)
threshold
Vtdac1_2W
Step 1 (Initial state+1)
0.285
0.294
0.303
V
voltage
Vtdac2_2W
Step 2 (Initial state+2)
0.267
0.276
0.285
V
Vtdac3_2W
Step 3 (Initial state+3)
0.240
0.249
0.258
V
Vtdac4_2W
Step 4 (Initial state+4)
0.201
0.21
0.219
V
Vtdac5_2W
Step 5 (Initial state+5)
0.157
0.165
0.173
V
Vtdac6_2W
Step 6 (Initial state+6)
0.107
0.114
0.121
V
(current step
switching)
W1-2 phase
Vtdac7_2W
Step 7 (Initial state+7)
0.053
0.06
0.067
V
Vtdac0_W
Step 0 (When initialized : channel 1
0.291
0.3
0.309
V
Vtdac2_W
Step 2 (Initial state+1)
0.267
0.276
0.285
V
Vtdac4_W
Step 4 (Initial state+2)
0.201
0.21
0.219
V
Vtdac6_W
Step 6 (Initial state+3)
0.107
0.114
0.121
V
Vtdac0_H
Step 0 (When initialized : channel 1
0.291
0.3
0.309
V
drive
1-2 phase drive
comparator level)
comparator level)
2 phase drive
Vtdac4_H
Step 4 (Initial state+1)
0.201
0.21
0.219
V
Vtdac4_F
Step 4' (When initialized : channel 1
0.291
0.3
0.309
V
comparator level)
Continued on next page.
No.A1987-2/26
LV8736LF
Continued from preceding page.
Ratings
Parameter
Symbol
Conditions
Unit
min
typ
max
Current setting comparator
Vtatt00
ATT1 = L, ATT2 = L
0.291
0.3
0.309
threshold voltage
Vtatt01
ATT1 = H, ATT2 = L
0.232
0.24
0.248
V
Vtatt10
ATT1 = L, ATT2 = H
0.143
0.15
0.157
V
0.053
0.06
0.067
40
50
60
kHz
7
10
13
μA
0.8
1
1.2
V
400
mV
(current attenuation rate switching)
Vtatt11
ATT1 = H, ATT2 = H
Chopping frequency
Fchop
Cchop = 200pF
CHOP pin charge/discharge current
Ichop
Chopping oscillation circuit
Vtup
V
V
threshold voltage
VREF pin input current
Iref
VREF = 1.5V
MONI pin saturation voltage
Vsatmon
Imoni = 1mA
μA
-0.5
Charge pump
VG output voltage
VG
Rise time
tONG
Oscillator frequency
Fosc
28
VG = 0.1μF
90
28.7
29.8
V
200
500
μS
125
150
kHz
400
mV
Output short-circuit protection
EMO pin saturation voltage
Vsatemo
Iemo = 1mA
CEM pin charge current
Icem
Vcem = 0V
CEM pin threshold voltage
Vtcem
7
10
13
μA
0.8
1
1.2
V
Package Dimensions
unit : mm (typ)
3415
TOP VIEW
SIDE VIEW
BOTTOM VIEW
44
0.5
(4.2)
(3.0)
6.0
6.0
2 1
12
0.0 NOM
(0.8)
SIDE VIEW
0.4
(1.0)
0.85 MAX
0.16
SANYO : VQFN44L(6.0X6.0)
No.A1987-3/26
LV8736LF
Pd max - Ta
Allowable power dissipation, Pd max - W
4.0
*1 With components mounted on the exposed die-pad board
*2 With no components mounted on the exposed die-pad board
3.0
2.75
2.10
2.0
*1
*2
1.43
1.10
1.0
0
—20
0
20
40
60
80
100
Ambient temperature, Ta - C
Substrate Specifications (Substrate recommended for operation of LV8736LF)
Size
: 57mm × 57mm × 1.6mm (4-layer substrate [2S2P])
Material
: Glass epoxy
Copper wiring density : L1 = 75% / L4 = 85%
L1 : Copper wiring pattern diagram
L4 : Copper wiring pattern diagram
Cautions
1) The data for the case with the Exposed Die-Pad substrate mounted shows the values when 90% 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.A1987-4/26
MONI
PGND
VM
GND
VREF
VREG5
+
-
LVS
TSD
+
-
CHOP
Oscillation
circuit
Regulator
ATT2
Attenuator
(4 levels
selectable)
ST ATT1
Charge pump
Output preamplifier stage
RF1
OUT1B VM1
MD1/
DC11
VM2 OUT2A
Output control logic
+
RF2
Current
Limit Mask
Current
selection
(2W1-2/
W1-2/1-2/2)
OUT2B
MD2/ FR/ STEP/ RST/ OE/ DM EMM
DC12 DC21 DC22 BLK CMK
+
Current
selection
(2W1-2/
W1-2/1-2/2)
OUT1A
Output preamplifier stage
VG
Output preamplifier stage
CP1
Output preamplifier stage
CP2
CEM
EMO
LV8736LF
Block Diagram
No.A1987-5/26
LV8736LF
MD1/DC11
MD2/DC12
FR/DC21
STEP/DC22
RST/BLK
MONI
CHOP
EMM
CEM
EMO
ATT1
Pin Assignment
33
32
31
30
29
28
27
26
25
24
23
NC 34
22 ATT2
DM 35
21 VREG5
OE/CMK 36
20 CP1
ST 37
19 CP2
18 VM
VREF 38
LV8736LF
GND 39
17 VG
OUT2B 40
16 OUT1A
OUT2B 41
15 OUT1A
PGND 42
14 PGND
VM2 43
13 VM1
VM2 44
12 VM1
11
NC
10
RF1
9
RF1
8
OUT1B
7
OUT1B
OUT2A
6
OUT2A
5
4
NC
3
RF2
2
RF2
NC
1
Top view
Pin Functions
Pin No.
Pin name
Pin Function
17
VG
18
VM
Charge pump capacitor connection pin.
Motor power supply connection pin.
19
CP2
Charge pump capacitor connection pin.
20
CP1
Charge pump capacitor connection pin.
21
VREG5
Internal power supply capacitor connection pin.
22
ATT2
Motor holding current switching pin.
23
ATT1
Motor holding current switching pin.
24
EMO
Output short-circuit state warning output pin.
25
CEM
Pin to connect the output short-circuit state detection time setting capacitor.
26
EMM
Output short-circuit protection mode switching pin.
27
CHOP
Chopping frequency setting capacitor connection pin.
28
MONI
Position detection monitor pin.
29
RST/BLK
RESET input pin (STM) / Blanking time switching pin (DCM).
30
STEP/DC22
STEP signal input pin (STM) / Channel 2 output control input pin 2 (DCM).
31
FR/DC21
CW / CCW signal input pin (STM) / Channel 2 output control input pin 1 (DCM).
32
MD2/DC12
Excitation mode switching pin 2 (STM) / Channel 1 output control input pin 2 (DCM).
33
MD1/DC11
Excitation mode switching pin 1 (STM) / Channel 1 output control input pin 1 (DCM).
35
DM
Drive mode (STM/DCM) switching pin.
36
OE/CMK
Output enable signal input pin / Current limit mask time setting capacitor connection pin.
37
ST
Chip enable pin.
38
VREF
Constant current control reference voltage input pin.
39
GND
Ground.
40, 41
OUT2B
Channel 2 OUTB output pin.
43, 44
VM2
Channel 2 motor power supply connection pin.
2, 3
RF2
Channel 2 current-sense resistor connection pin.
5, 6
OUT2A
Channel 2 OUTA output pin.
No.A1987-6/26
LV8736LF
Continued on next page.
Continued from preceding page.
Pin No.
Pin name
Pin Function
7, 8
OUT1B
9, 10
RF1
Channel 1 current-sense resistor connection pin.
12, 13
VM1
Channel 1 motor power supply connection pin.
15, 16
OUT1A
Channel 1 OUTA output pin.
14, 42
PGND
Power system ground.
N.C.
No Connection. (No internal connection to the IC)
1, 4,
Channel 1 OUTB output pin.
11, 34
Equivalent circuit
Pin No.
Pin Name
22
ATT2
23
ATT1
26
EMM
29
RST/BLK
30
STEP/DC22
31
FR/DC21
32
MD2/DC12
33
MD1/DC11
35
DM
Equivalent Circuit
VREG5
GND
37
ST
VREG5
GND
40, 41
OUT2B
14, 42
PGND
43, 44
VM2
2, 3
RF2
5, 6
OUT2A
7, 8
OUT1B
9, 10
RF1
12, 13
VM1
15, 16
OUT1A
43 44
12 13
40 41
7 8
5 6
15 16
14 42
2 3
9 10
GND
Continued on next page.
No.A1987-7/26
LV8736LF
Continued from preceding page.
Pin No.
Pin Name
17
VG
18
VM
19
CP2
20
CP1
Equivalent Circuit
20
18
19
17
VREG5
GND
38
VREF
VREG5
GND
21
VREG5
VM
GND
24
EMO
28
MONI
VREG5
GND
25
CEM
VREG5
GND
Continued on next page.
No.A1987-8/26
LV8736LF
Continued from preceding page.
Pin No.
27
Pin Name
CHOP
Equivalent Circuit
VREG5
GND
36
OE/CMK
VREG5
GND
No.A1987-9/26
LV8736LF
Description of operation
Input Pin Function
The function to prevent including the turn from the input to the power supply is built into each input pin.
Therefore, the current turns to the power supply even if power supply (VM) is turned off with the voltage impressed to
the input pin and there is not crowding.
(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
Input
Operating mode
ST
STEP
Low
*
Standby mode
High
Excitation step proceeds
High
Excitation step is kept
(2) Excitation mode setting function
MD1
Low
MD2
Excitation mode
Initial position
Channel 1
Channel 2
Low
2 phase excitation
100%
-100%
High
Low
1-2 phase excitation
100%
0%
Low
High
W1-2 phase excitation
100%
0%
High
High
2W1-2 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) Position detection monitoring function
The MONI position detection monitoring pin is of an open drian type.
When the excitation position is in the initial position, the MONI output is placed in the ON state.
(Refer to "Examples of current waveforms in each of the excitation modes.")
No.A1987-10/26
LV8736LF
(4) Setting constant-current control reference current
This IC is designed to automatically exercise PWM constant-current chopping control for the motor current by setting
the output current. Based on the voltage input to the VREF pin and the resistance connected between RF and GND,
the output current that is subject to the constant-current control is set using the calculation formula below :
IOUT = (VREF/5)/RF resistance
* The above setting is the output current at 100% of each excitation mode.
The voltage input to the VREF pin can be switched to four-step settings depending on the statuses of the two inputs,
ATT1 and ATT2. This is effective for reducing power consumption when motor holding current is supplied.
Attenuation function for VREF input voltage
ATT1
ATT2
Current setting reference voltage attenuation ratio
Low
Low
100%
High
Low
80%
Low
High
50%
High
High
20%
The formula used to calculate the output current when using the function for attenuating the VREF input voltage is
given below.
IOUT = (VREF/5) × (attenuation ratio)/RF resistance
Example : At VREF of 1.5V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RF resistance of
0.47Ω, the output current is set as shown below.
IOUT = 1.5V/5 × 100%/0.47Ω = 0.64A
If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows :
IOUT = 0.64A × 20% = 128mA
In this way, the output current is attenuated when the motor holding current is supplied so that power can
be conserved.
(5) Input timing
TstepH TstepL
STEP
Tdh
Tds
(md1 step) (step md1)
MD1
Tdh
Tds
(md2 step) (step md2)
MD2
Tdh
Tds
(fr step) (step fr)
FR
TstepH/TstepL : Clock H/L pulse width (min 500ns)
Tds : Data set-up time (min 500ns)
Tdh : Data hold time (min 500ns)
(6) 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 stepping motor driver mode (DM = Low or Open) of this IC, the blanking time is fixed at approximately 1μs.
In the DC motor driver mode (DM = High), the blanking time can be switched to one of two levels using the
RST/BLK pin. (Refer to "Blanking time switching function.")
No.A1987-11/26
LV8736LF
(7) Reset function
Only STM mode is pin at the DCM mode BLK: It operates as a switch function of the time of the bran king.
RST
Operating mode
Low
Normal operation
High
Reset state
RST
RESET
STEP
MONI
1ch output
0%
2ch output
Initial state
When the RST pin is set to High, the excitation position of the output is forcibly set to the initial state, and the MONI
output is placed in the ON state. When RST is then set to Low, the excitation position is advanced by the next STEP
input.
(8) Output enable function
Only STM mode is pin at the DCM mode CMK: It operates as current LIMIT mask function.
OE
Operating mode
Low
Output ON
High
Output OFF
OE
Power save mode
STEP
MONI
1ch output
0%
2ch output
Output is high-impedance
When the OE pin is set High, 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 Low, the output level conforms to the excitation position proceeded by the STEP
input.
No.A1987-12/26
LV8736LF
(9) 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.
(10) Chopping frequency setting
For constant-current control, this IC performs chopping operations at the frequency determined by the capacitor
(Cchop) connected between the CHOP pin and GND.
The chopping frequency is set as shown below by the capacitor (Cchop) connected between the CHOP pin and GND.
Fchop = Ichop/ (Cchop × Vtchop × 2) (Hz)
Ichop : Capacitor charge/discharge current, typ 10μA
Vtchop : Charge/discharge hysteresis voltage (Vtup-Vtdown), typ 0.5V
For instance, when Cchop is 180pF, the chopping frequency will be as follows :
Fchop = 10μA/ (180pF × 0.5V × 2) = 55kHz
No.A1987-13/26
LV8736LF
(11) Output current vector locus (one step is normalized to 90 degrees)
100.0
θ0
θ4' (2-phase)
θ1
θ2
Channel 1 phase current ratio (%)
θ3
θ4
66.7
θ5
θ6
33.3
θ7
θ8
0.0
0.0
33.3
66.7
100.0
Channel 2 current ratio (%)
Setting current ration in each excitation mode
STEP
2W1-2 phase (%)
Channel 1
W1-2 phase (%)
Channel 2
Channel 1
θ0
100
0
θ1
98
20
θ2
92
38
θ3
83
55
θ4
70
70
θ5
55
83
θ6
38
92
θ7
20
98
θ8
0
100
1-2 phase (%)
Channel 2
Channel 1
100
0
92
38
70
70
38
92
0
100
2-phase (%)
Channel 2
Channel 1
100
0
70
70
0
100
100
Channel 2
100
No.A1987-14/26
LV8736LF
(12) 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 (CW mode)
STEP
MONI
(%)
100
I1
0
-100
(%)
100
I2
0
-100
No.A1987-15/26
LV8736LF
W1-2 phase excitation (CW mode)
STEP
MONI
(%)
100
I1
0
-100
(%)
100
I2
0
-100
2W1-2 phase excitation (CW mode)
STEP
MONI
(%)
100
50
I1
0
-50
-100
(%)
100
50
I2
0
-50
-100
No.A1987-16/26
LV8736LF
(13) Current control operation specification
(Sine wave increasing direction)
STEP
Set current
Set current
Coil current
Chopping cycle
BLANKING
section
BLANKING
section
Current mode CHARGE
SLOW
FAST
CHARGE
SLOW
FAST
(Sine wave decreasing direction)
STEP
Set current
Coil current
Set current
Chopping cycle
Chopping cycle
BLANKING
section
Current mode CHARGE
SLOW
BLANKING
section
FAST
CHARGE
FAST
BLANKING
section
CHARGE
SLOW
In each current mode, the operation sequence is as described below :
• At rise of chopping frequency, the CHARGE mode begins. (In the time defined as the “blanking time,” the CHARGE
mode is forced regardless of the magnitude of the coil current (ICOIL) and set current (IREF).)
• The coil current (ICOIL) and set current (IREF) are compared in this blanking time.
When (ICOIL < IREF) state exists ;
The CHARGE mode up to ICOIL ≥ IREF, then followed by changeover to the SLOW DECAY mode, and
chopping frequency finally by the FAST DECAY mode for approximately 1μs.
When (ICOIL < IREF) state does not exist ;
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.A1987-17/26
LV8736LF
DCM Mode (DM-High)
(1) DCM mode output control logic
Parallel input
Output
DC11 (21)
DC12 (22)
Low
High
Mode
OUT1 (2) A
OUT1 (2) B
Low
OFF
OFF
Standby
Low
High
Low
CW (Forward)
Low
High
Low
High
CCW (Reverse)
High
High
Low
Low
Brake
(2) Blanking time switching function
Only the DCM mode. At STM mode RST pin : It operates as RESET function.
BLK
Blanking time
Low
2μs
High
3μs
(3) Current limit reference voltage setting function
By setting a current limit, this IC automatically exercises short braking control to ensure that when the motor current
has reached this limit, the current will not exceed it.
(Current limit control time chart)
Set current
Chopping cycle
Coil current
BLANKING
section
Current mode
CHARGE
SLOW
The limit current is set as calculated on the basis of the voltage input to the VREF pin and the resistance between the
RF pin and GND using the formula given below.
Ilimit = (VREF/5) /RF resistance
The voltage applied to the VREF pin can be switched to any of the four setting levels depending on the statuses of the
two inputs, ATT1 and ATT2.
Function for attenuating VREF input voltage
ATT1
ATT2
Current setting reference voltage attenuation ratio
Low
Low
100%
High
Low
80%
Low
High
50%
High
High
20%
The formula used to calculate the output current when using the function for attenuating the VREF input voltage is
given below.
Ilimit = (VREF/5) × (attenuation ratio) /RF resistance
Example : At VREF of 1.5V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RF resistance of
0.47Ω, the output current is set as shown below.
Ilimit = 1.5V/5 × 100%/0.47Ω = 0.64A
If, in this state, (ATT1, ATT2) has been set to (H, H), Ilimit will be as follows :
Ilimit = 0.64A × 20% = 128mA
No.A1987-18/26
LV8736LF
(4) Current LIMIT mask function
Only the DCM mode. At STM mode OE pin : It operates as output enable function.
The mask can do current LIMIT function during the fixed time set with the CMK pin at the DCM mode. It is effective
to make it not hang to the limiter by the start current of the motor to set current LIMIT low.
The charge is begun, current LIMIT function is done to the CMK capacitor meanwhile when switching to forward/
reverse mode, and the mask is done. Afterwards, the mask is released when the voltage of the CMK pin reaches set
voltage (typ 1.5V), and the current limit function works.
When 2ch side begins forward (reverse) operation while the mask on 1ch side is operating, the CMK pin is discharged
one degree up to a constant voltage, and begins charging again because the CMK pin becomes 2ch using combinedly.
Meanwhile, 1ch side and 2ch side enter the state of the mask.
1ch operate
brake
forward
forward
brake
forward
2ch operate
brake
brake
brake
forward
brake
1.5V
CMK
(capacitor)
1ch
current limit
2ch
current limit
0.3V
mask
release
release
mask
release
release
mask
mask
mask
mask
When the capacitor is not connected, the function of LIMIT in the current can be switched to operation/nonoperating
state by the state of the input of the CMK pin.
CMK
Current LIMIT function
“L”
nonoperating
“H” or OPEN
operation
(5) Current LIMIT mask time (Tcmk)
The time of the mask of current LIMIT function can be set by connecting capacitor Ccmk between CMK pin - GND.
Decide the value of capacitor Ccmk according to the following expressions.
Mask time : Tcmk Tcmk ≈ -Ccmk × R × 1n ( 1- Vtcmk / (Icmk × R )) (sec)
Vtcmk : LIMIT mask threshold voltage typ 1.5V
Icmk : CMK pin charge current typ 25μA
R : Internal resistance typ 100kΩ
No.A1987-19/26
LV8736LF
(6) Typical current waveform in each excitation mode when stepping motor parallel input control
2-phase excitation (CW mode)
DC11
DC12
DC21
DC22
(%)
100
I1
0
-100
(%)
100
I2
0
-100
1-2 phase excitation full torque (CW mode)
DC11
DC12
DC21
DC22
(%)
100
l1
0
-100
(%)
100
l2
0
-100
No.A1987-20/26
LV8736LF
Output short-circuit protection function
This IC incorporates an output short-circuit protection circuit that, when the output has been shorted by an event such
as shorting to power or shorting to ground, sets the output to the standby mode and turns on the warning output in
order to prevent the IC from being damaged. In the stepping motor driver (STM) mode (DM = Low), this function
sets the output to the standby mode for both channels by detecting the short-circuiting in one of the channels. In the
DC motor driver mode (DM = High), channels 1 and 2 operate independently. (Even if the output of channel 1 has
been short-circuited, channel 2 will operate normally.)
(1) Output short-circuit protection operation changeover function
Changeover to the output short-circuit protection of IC is made by the setting of EMM pin.
EMM
State
Low or Open
Latch method
High
Auto reset method
(2) Latch type
In the latch mode, when the output current exceeds the detection current level, the output is turned OFF, and this state
is held.
The detection of the output short-circuited state by the IC causes the output short-circuit protection circuit to be
activated.
When the short-circuited state continues for the period of time set using the internal timer (approximately 2μs), the
output in which the short-circuiting has been detected is first set to OFF. After this, the output is set to ON again as
soon as the timer latch time (Tcem) described later has been exceeded, and if the short-circuited state is still detected,
all the outputs of the channel concerned are switched to the standby mode, and this state is held.
This state is released by setting ST to low.
Output ON
H-bridge
output state
Output ON
Output OFF
Standby state
Threshold voltage
CEM voltage
Short-circuit
detection state
Short- Release
circuit
Short-circuit
Internal counter
1st counter
start
1st counter 1st counter
stop
start
1st counter
end
2nd counter
start
2nd counter
end
No.A1987-21/26
LV8736LF
(3) Auto reset type
In the automatic reset mode, when the output current exceeds the detection current level, the output waveform
changes to the switching waveform.
As with the latch system, when the output short-circuited state is detected, the short-circuit protection circuit is
activated. When the operation of the short-circuit detection circuit exceeds the timer latch time (Tcem) described later,
the output is changed over to the standby mode and is reset to the ON mode again in 2ms (typ). In this event, if the
overcurrent mode still continues, the switching mode described above is repeated until the overcurrent mode is
canceled.
(4) Unusual condition warning output pins (EMO, MONI)
The LV8731V is provided with the EMO pin which notifies the CPU of an unusual condition if the protection circuit
operates by detecting an unusual condition of the IC. This pin is of the open-drain output type and when an unusual
condition is detected, the EMO output is placed in the ON (EMO = Low) state.
In the DC motor driver mode (DM = High), the MONI pin also functions as a warning output pin.
The functions of the EMO pin and MONI pin change as shown below depending on the state of the DM pin.
When the DM is low (STM mode) :
EMO : Unusual condition warning output pin
MONI : Excitation initial position detection monitoring
When the DM is high (DCM) mode) :
EMO : Channel 1 warning output pin
MONI : Channel 2 warning output pin
Furthermore, the EMO (MONI) pin is placed in the ON state when one of the following conditions occurs.
1. Shorting-to-power, shorting-to-ground, or shorting-to-load occurs at the output pin and the output short-circuit
protection circuit is activated.
2. The IC junction temperature rises and the thermal protection circuit is activated.
Unusual condition
DM = L (STM mode)
DM = H (DCM mode)
EMO
MONI
EMO
MONI
Channel 1 short-circuit detected
ON
-
ON
-
Channel 2 short-circuit detected
ON
-
-
ON
Overheating condition detected
ON
-
ON
ON
(5) Timer latch time (Tcem)
The time taken for the output to be set to OFF when the output has been short-circuited can be set using capacitor
Ccem, connected between the CEM pin and GND. The value of capacitor Ccem is determined by the formula given
below.
Timer latch : Tcem
Tcem ≈ Ccem × Vtcem/Icem [sec]
Vtcem : Comparator threshold voltage, typ 1V
Icem : CEM pin charge current, typ 10μA
Overheating protection function
The overheating protection circuit is built into, 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. The value of hysteresis and when it falls,
the temperature drives the output again (automatic restoration).
The overheating protection circuit doesn't secure protection and the destruction prevention of the set because it
becomes operation by the area where ratings Tjmax=150°C of the junction temperature was exceeded.
TSD = 180°C (typ)
ΔTSD = 40°C (typ)
No.A1987-22/26
LV8736LF
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. Because the output is not turned on if VM+4V or more is not pressured, the voltage of
the VG pin recommends the drive of the motor to put the time of tONG or more, and to begin.
ST
VG pin voltage
VM+VREG5
VM+4V
VM
tONG
VG Pin Voltage Schematic View
No.A1987-23/26
LV8736LF
Application Circuit Example
29
28
27
26
FR/DC21
STEP/DC22
RST/BLK
MONI
CHOP
EMM
Short-circuit state
detection monitor
25
24
23
ATT1
100pF
30
CEM
31
EMO
32
MD1/DC11
180pF
Clock input
33
MD2/DC12
Logic input
34 NC
Position detection
monitor
• Stepping motor driver circuit (DM = Low)
ATT2 22
VREG5 21
35 DM
1.5V
- +
36 OE/CMK
CP1 20
37 ST
CP2 19
VM 18
38 VREF
39
LV8736LF
GND
VG 17
40 OUT2B
OUT1A 16
41 OUT2B
OUT1A 15
42 PGND
PGND 14
7
8
NC
6
RF1
5
RF1
4
OUT1B
3
OUT1B
2
OUT2A
1
OUT2A
NC
VM1 12
RF2
44 VM2
RF2
VM1 13
NC
43 VM2
9
10
11
24V
+ -
M
The formulae for setting the constants in the examples of the application circuits above are as follows :
Constant current (100%) setting
When VREF = 1.5V
IOUT = VREF/5/RF resistance
= 1.5V/5/0.47Ω = 0.64A
Chopping frequency setting
Fchop = Ichop/ (Cchop × Vtchop × 2)
= 10μA/ (180pF × 0.5V × 2) = 55kHz
Timer latch time when the output is short-circuited
Tcem = Ccem × Vtcem/Icem
= 100pF × 1V/10μA = 10μs
No.A1987-24/26
LV8736LF
30
29
28
27
26
25
FR/DC21
STEP/DC22
RST/BLK
MONI
CHOP
EMM
CEM
Channel 1 short-circuit
state detection monitor
24
23
EMO
31
ATT1
100pF
32
MD1/DC11
34 NC
33
MD2/DC12
Logic input
180pF
Channel 2 short-circuit
state detection monitor
• DC motor 2 driver circuit (DM = High)
ATT2 22
VREG5 21
35 DM
1.5V
- +
36 OE/CMK
CP1 20
37 ST
CP2 19
VM 18
38 VREF
39
LV8736LF
GND
VG 17
40 OUT2B
OUT1A 16
41 OUT2B
OUT1A 15
42 PGND
PGND 14
NC
OUT2A
OUT2A
OUT1B
OUT1B
RF1
RF1
NC
VM1 12
RF2
44 VM2
RF2
VM1 13
NC
43 VM2
1
2
3
4
5
6
7
8
9
10
11
M
24V
+ -
M
The formulae for setting the constants in the examples of the application circuits above are as follows :
Constant current limit (100%) setting
When VREF = 1.5V
Ilimit = VREF/5/RF resistance
= 1.5V/5/0.47Ω = 0.64A
Chopping frequency setting
Fchop = Ichop/ (Cchop × Vtchop × 2)
= 10μA/ (180pF × 0.5V × 2) = 55kHz
Timer latch time when the output is short-circuited
Tcem = Ccem × Vtcem/Icem
= 100pF × 1V/10μA = 10μs
Current limit mask time
Tcmk=-Ccmk × R × In(1-Vtcmk/(Icmk × R))
=916μs
No.A1987-25/26
LV8736LF
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to change without notice.
PS No.A1987-26/26