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Ordering number : ENA1482A
LV8731V
Overview
Bi-CMOS LSI
PWM Constant-Current Control Stepping Motor Driver
The LV8731V is a 2-channel H-bridge driver IC that can switch a stepping motor driver, which is capable of micro-step drive and supports 4W 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 : 0.3 ; lower side : 0.25 ; total of upper and lower : 0.55 ; Ta = 25C, IO = 2A) * Excitation mode can be set to 2-phase, 1-2 phase, W1-2 phase , or 4W1-2 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 * No control power supply required
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Supply voltage Output peak current Output current Logic input voltage MONI/EMO input voltage Symbol VM max IO peak IO max VIN Vmoni/Vemo tw 10ms, duty 20% Conditions Ratings 36 2.5 2 -0.3 to +6 -0.3 to +6 Unit V A A V 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.
D0909 SY / 82609 MS PC 20090512-S00006 No.A1482-1/26
LV8731V
Continued from preceding page. Parameter Allowable power dissipation Operating temperature Storage temperature Symbol Pd max Topr Tstg Ta 85C * Conditions Ratings 3.25 -20 to +85 -55 to +150 Unit W C C
* Specified circuit board : 90.0mmx90.0mmx1.6mm, glass epoxy 2-layer board, with backside mounting.
Allowable Operating Ratings at Ta = 25C
Parameter Supply voltage range Logic input voltage VREF input voltage range Symbol VM VIN VREF Conditions Ratings 9 to 32 0 to 5.5 0 to 3 Unit V V V
Electrical Characteristics at Ta = 25C, VM = 24V, VREF = 1.5V
Parameter Standby mode current drain Current drain VREG5 output voltage Thermal shutdown temperature Thermal hysteresis width Motor driver Output on resistance Ronu Rond Output leakage current Diode forward voltage Logic pin input current IOleak VD IINL IINH Logic high-level input voltage Logic low-level input voltage Current setting comparator threshold voltage (current step switching) 4W1-2-phase drive Vtdac1_4W Vtdac2_4W Vtdac3_4W Vtdac4_4W Vtdac5_4W Vtdac6_4W Vtdac7_4W Vtdac8_4W Vtdac9_4W Vtdac10_4W Vtdac11_4W Vtdac12_4W Vtdac13_4W Vtdac14_4W Vtdac15_4W W1-2-phase drive Vtdac4_W Vtdac8_W Vtdac12_W 1-2 phase drive Vtdac0_H Vtdac8_H 2 phase drive Vtdac8_F Vtdac0_W VINH VINL Vtdac0_4W Step 0 (When initialized : channel 1 comparator level) Step 1 (Initial state+1) Step 2 (Initial state+2) Step 3 (Initial state+3) Step 4 (Initial state+4) Step 5 (Initial state+5) Step 6 (Initial state+6) Step 7 (Initial state+7) Step 8 (Initial state+8) Step 9 (Initial state+9) Step 10 (Initial state+10) Step 11 (Initial state+11) Step 12 (Initial state+12) Step 13 (Initial state+13) Step 14 (Initial state+14) Step 15 (Initial state+15) Step 0 (When initialized : channel 1 comparator level) Step 4 (Initial state+1) Step 8 (Initial state+2) Step 12 (Initial state+3) Step 0 (When initialized : channel 1 comparator level) Step 8 (Initial state+1) Step 8' (When initialized : channel 1 comparator level) Continued on next page. 0.201 0.291 0.21 0.3 0.219 0.309 V V 0.267 0.201 0.107 0.291 0.276 0.21 0.114 0.3 0.285 0.219 0.121 0.309 V V V V 0.291 0.285 0.279 0.267 0.255 0.240 0.222 0.201 0.180 0.157 0.134 0.107 0.080 0.053 0.023 0.291 0.3 0.294 0.288 0.276 0.264 0.249 0.231 0.21 0.189 0.165 0.141 0.114 0.087 0.06 0.03 0.3 0.309 0.303 0.297 0.285 0.273 0.258 0.240 0.219 0.198 0.173 0.148 0.121 0.094 0.067 0.037 0.309 V V V V V V V V V V V V V V V V 0.291 0.3 ID = -2A VIN = 0.8V VIN = 5V 4 30 2.0 0.8 0.309 1.2 8 50 IO = 2A, Upper-side on resistance IO = 2A, Lower-side on resistance 0.3 0.25 0.4 0.33 50 1.4 12 70 A V A A V V V Symbol IMst IM Vreg5 TSD TSD ST = "L" ST = "H", OE = "L", with no load IO = -1mA Design guarantee Design guarantee 4.5 150 Conditions min Ratings typ 100 3.2 5 180 40 max 400 5 5.5 200 A mA V C C Unit
No.A1482-2/26
LV8731V
Continued from preceding page. Parameter Current setting comparator threshold voltage (current attenuation rate switching) Symbol Vtatt00 Vtatt01 Vtatt10 Vtatt11 Chopping frequency CHOP pin charge/discharge current Chopping oscillation circuit threshold voltage VREF pin input current MONI pin saturation voltage Charge pump VG output voltage Rise time Oscillator frequency Output short-circuit protection EMO pin saturation voltage CEM pin charge current CEM pin threshold voltage Vsatemo Icem Vtcem Iemo = 1mA Vcem = 0V 7 0.8 10 1 400 13 1.2 mV A V VG tONG Fosc VG = 0.1F 90 28 28.7 200 125 150 29.8 V S kHz Iref Vsatmon VREF = 1.5V Imoni = 1mA -0.5 400 A mV Fchop Ichop Vtup Conditions min ATT1 = L, ATT2 = L ATT1 = H, ATT2 = L ATT1 = L, ATT2 = H ATT1 = H, ATT2 = H Cchop = 200pF 0.291 0.232 0.143 0.053 40 7 0.8 Ratings typ 0.3 0.24 0.15 0.06 50 10 1 max 0.309 0.248 0.157 0.067 60 13 1.2 V V V V kHz A V Unit
Package Dimensions
unit : mm (typ) 3333
TOP VIEW 15.0 44 23 SIDE VIEW BOTTOM VIEW
(4.7)
5.6 7.6 (3.5)
1 (0.68)
0.65
0.22
22
0.2
1.7MAX
SIDE VIEW
0.1 (1.5)
0.5
SANYO : SSOP44K(275mil)
No.A1482-3/26
LV8731V
4.0
Pd max - Ta
*1 With components mounted on the exposed die-pad board *2 With no components mounted on the exposed die-pad board
Allowable power dissipation, Pd max - W
3.25 3.0
Two-layer circuit board 1 *1
2.20 2.0
Two-layer circuit board 2 *2
1.69
1.14 1.0
0 - 20
0
20
40
60
80
100
Ambient temperature, Ta - C
Substrate Specifications (Substrate recommended for operation of LV8731V) Size : 90mm x 90mm x 1.6mm (two-layer substrate [2S0P]) Material : Glass epoxy Copper wiring density : L1 = 85% / L2 = 90%
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 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.A1482-4/26
LV8731V
Pin Assignment
VG 1 VM 2 CP2 3 CP1 4 VREG5 5 ATT2 6 ATT1 7 EMO 8 CEM 9 EMM 10 CHOP 11
44 OUT1A 43 OUT1A 42 PGND 41 NC 40 NC 39 VM1 38 VM1 37 RF1 36 RF1 35 OUT1B 34 OUT1B
LV8731V
MONI 12 RST/BLK 13 STEP/DC22 14 FR/DC21 15 MD2/DC12 16 MD1/DC11 17 DM 18 OE 19 ST 20 VREF 21 GND 22 Top view 33 OUT2A 32 OUT2A 31 RF2 30 RF2 29 VM2 28 VM2 27 NC 26 NC 25 PGND 24 OUT2B 23 OUT2B
No.A1482-5/26
Block Diagram
CP2 OUT1A VM2 OUT2A OUT2B
CP1
VG
RF1
OUT1B VMI
RF2
VM + PGND MONI
Output preamplifier stage
Output preamplifier stage
Output preamplifier stage
Output preamplifier stage
Charge pump
EMO
LV8731V
VREG5 Regulator + VREF + Oscillation circuit TSD LVS CHOP ST ATT1 ATT2 Attenuator (4 levels selectable) Current selection (4W1-2/ W1-2/1-2/2)
Output control logic CEM + Current selection (4W1-2/ W1-2/1-2/2)
SGND
MD1/ MD2/ FR/ STEP/ RST/ OE DC11 DC12 DC21 DC22 BLK
DM
EMM
No.A1482-6/26
LV8731V
Pin Functions
Pin No. 6 7 10 13 14 15 Pin Name ATT2 ATT1 EMM RST/BLK STEP/DC22 FR/DC21 Pin Functtion Motor holding current switching pin. Motor holding current switching pin. Output short-circuit protection mode switching pin. RESET input pin (STM) / Blanking time switching pin (DCM). STEP signal input pin (STM) / Channel 2 output control input pin 2 (DCM). CW / CCW signal input pin (STM) / Channel 2 output control input pin 1 (DCM). 16 MD2/DC12 Excitation mode switching pin 2 (STM) / Channel 1 output control input pin 2 (DCM). 17 MD1/DC11 Excitation mode switching pin 1 (STM) / Channel 1 output control input pin 1 (DCM). 18 19 20 DM OE ST Drive mode (STM/DCM) switching pin. Output enable signal input pin. Chip enable pin. Equivalent Circuit
VREG5
10k
100k
GND
VREG5
20k 10k
80k GND
23, 24 25, 42 28, 29 30, 31 32, 33 34, 35 36, 37 38, 39 43, 44 OUT2B PGND VM2 RF2 OUT2A OUT1B RF1 VM1 OUT1A Channel 2 OUTB output pin. Power system ground. Channel 2 motor power supply connection pin. Channel 2 current-sense resistor connection pin. Channel 2 OUTA output pin. Channel 1 OUTB output pin. Channel 1 current-sense resistor connection pin. Channel 1 motor power supply pin. Channel 1 OUTA output pin.
38 39 28 29
43 44 32 33
34 35 23 24
10k 25 42 36 37 30 31 GND
500 500
Continued on next page.
No.A1482-7/26
LV8731V
Continued from preceding page. Pin No. 1 2 3 4 Pin Name VG VM CP2 CP1 Pin Functtion Charge pump capacitor connection pin. Motor power supply connection pin. Charge pump capacitor connection pin. Charge pump capacitor connection pin. Equivalent Circuit
4 VREG5
2
3
1
100
GND
21 VREF Constant current control reference voltage input pin.
VREG5
500
GND
5 VREG5 Internal power supply capacitor connection pin.
VM
2k 78k
26k GND
8 12 EMO MONI Output short-circuit state warning output pin. Position detection monitor pin.
VREG5
GND
Continued on next page.
No.A1482-8/26
LV8731V
Continued from preceding page. Pin No. 9 Pin Name CEM Pin Functtion Pin to connect the output short-circuit state detection time setting capacitor. Equivalent Circuit
VREG5
GND
11
CHOP
Chopping frequency setting capacitor connection pin.
VREG5
500 GND
500
22 26, 27 40, 41
GND NC
Ground. No Connection (No internal connection to the IC)
No.A1482-9/26
LV8731V
Description of operation 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 Low or Open High Mode Standby mode Operating mode Internal regulator Standby Operating Charge pump Standby 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 Low or Open High Drive mode STM mode DCM mode Application Stepping motor channel 1 (CLK-IN) DC motor channel 2 or stepping motor channel 1 (parallel)
STM mode (DM = Low or Open) (1) STEP pin function
Input ST Low High High STP * Standby mode Excitation step proceeds Excitation step is kept Operating mode
(2) Excitation mode setting function
MD1 MD2 Excitation mode Channel 1 Low High Low High Low Low High High 2 phase excitation 1-2 phase excitation W1-2 phase excitation 4W1-2 phase excitation 100% 100% 100% 100% Initial position Channel 2 -100% 0% 0% 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.A1482-10/26
LV8731V
(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 Low High Low High ATT2 Low Low High High Current setting reference voltage attenuation ratio 100% 80% 50% 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) x (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 0.3, the output current is set as shown below. IOUT = 1.5V/5 x 100%/0.3 = 1.0A If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows : IOUT = 1.0A x 20% = 200mA In this way, the output current is attenuated when the motor holding current is supplied so that power can be conserved. (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 stepping motor driver mode (DM = Low or Open) of this IC, the blanking time is fixed at approximately 1s. 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.A1482-11/26
LV8731V
(6) Reset function
RST Low High Operating mode Normal operation Reset state
RST STEP MONI
RESET
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. (7) Output enable function
OE Low High Operating mode Output ON Output OFF
OE STEP MONI
Power save mode
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.A1482-12/26
LV8731V
(8) Forward/reverse switching function
FR Low High Operating mode Clockwise (CW) 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. (9) 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 x Vtchop x 2) (Hz) Ichop : Capacitor charge/discharge current, typ 10A Vtchop : Charge/discharge hysteresis voltage (Vtup-Vtdown), typ 0.5V For instance, when Cchop is 200pF, the chopping frequency will be as follows : Fchop = 10A/ (200pF x 0.5V x 2) = 50kHz
No.A1482-13/26
LV8731V
(10) Output current vector locus (one step is normalized to 90 degrees)
100.0 0
1
2
8' (2-phase) 3 4 5 6 7
Channel 1 phase current ratio (%)
66.7
8 9 10 11 12
33.3 13 14 15 0.0 0.0 16 33.3 66.7 100.0 Channel 2 current ratio (%)
Setting current ration in each excitation mode
STEP 4W1-2 phase (%) Channel 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 100 100 98 96 92 88 83 77 70 63 55 47 38 29 20 10 0 Channel 2 0 10 20 29 38 47 55 63 70 77 83 88 92 96 98 100 100 0 100 0 100 38 92 70 70 70 70 100 100 92 38 W1-2 phase (%) Channel 1 100 Channel 2 0 1-2 phase (%) Channel 1 100 Channel 2 0 2-phase (%) Channel 1 Channel 2
No.A1482-14/26
LV8731V
(11) 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.A1482-15/26
LV8731V
W1-2 phase excitation (CW mode)
STEP
MONI (%) 100
I1
0
-100 (%) 100
I2
0
-100
4W1-2 phase excitation (CW mode)
STEP
MONI (%) 100
50 I1 0
-50
-100 (%) 100
50 I2 0
-50
-100
No.A1482-16/26
LV8731V
(12) 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. (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 finally by the FAST DECAY mode for approximately 1s. 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.A1482-17/26
LV8731V
DCM Mode (DM-High) (1) DCM mode output control logic
Parallel input DC11 (21) Low High Low High DC12 (22) Low Low High High OUT1 (2) A OFF High Low Low Output OUT1 (2) B OFF Low High Low Standby CW (Forward) CCW (Reverse) Brake Mode
(2) Blanking time switching function
BLK Low High Blanking time 2s 3s
(3) Output enable function
OE Low High Operating mode Output ON Output OFF
When the OE pin is set High, the output is forced OFF and goes to high impedance. When the OE pin is set Low, output conforms to the control logic.
No.A1482-18/26
LV8731V
(4) 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
Current mode
Coil current Forced CHARGE section
fchop
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 Low High Low High ATT2 Low Low High High Current setting reference voltage attenuation ratio 100% 80% 50% 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) x (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 0.3, the output current is set as shown below. Ilimit = 1.5V/5 x 100%/0.3 = 1.0A If, in this state, (ATT1, ATT2) has been set to (H, H), Ilimit will be as follows : Ilimit = 1.0A x 20% = 200mA
No.A1482-19/26
LV8731V
(5) 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
DC21
DC12
DC22 (%) 100 l1 0 -100 (%) 100 l2 0 -100
No.A1482-20/26
LV8731V
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 Low or Open High State Auto reset method Latch 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 4s), 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
4s
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.A1482-21/26
LV8731V
(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) EMO Channel 1 short-circuit detected Channel 2 short-circuit detected Overheating condition detected ON ON ON MONI DM = H (DCM mode) EMO ON ON MONI 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 x Vtcem/Icem [sec] Vtcem : Comparator threshold voltage, typ 1V Icem : CEM pin charge current, typ 10A
No.A1482-22/26
LV8731V
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
VG Pin Voltage Schematic View
No.A1482-23/26
LV8731V
* Stepping motor driver circuit (DM = Low)
Application Circuit Example
1 VG 2 VM 3 CP2 4 CP1 5 VREG5 6 ATT2 Short-circuit state detection monitor 7 ATT1 8 EMO 9 CEM 10 EMM 200pF Position detection monitor Clock input 11 CHOP 12 MONI 13 RST/BLK 14 STEP/DC22 15 FR/DC21 16 MD2/DC12 Logic input 17 MD1/DC11 18 DM 19 OE 20 ST -+ 1.5V 21 VREF 22 GND
OUT1A 44 OUT1A 43 PGND 42 NC 41 NC 40 VM1 39 VM1 38 RF1 37 RF1 36 OUT1B 35 OUT1B 34 OUT2A 33 M OUT2A 32 RF2 31 RF2 30 VM2 29 VM2 28 NC 27 NC 26 PGND 25 OUT2B 24 OUT2B 23 24V +-
100pF
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/5/0.3 = 1.0A Chopping frequency setting Fchop = Ichop/ (Cchop x Vtchop x 2) = 10A/ (200pF x 0.5V x 2) = 50kHz Timer latch time when the output is short-circuited Tcem = Ccem x Vtcem/Icem = 100pF x 1V/10A = 10s
LV8731V
No.A1482-24/26
LV8731V
* DC motor driver circuit (DM = High, and the current limit function is in use.)
1 VG 2 VM 3 CP2 4 CP1 5 VREG5 6 ATT2 Channel 1 short-circuit state detection monitor 7 ATT1 8 EMO 9 CEM 10 EMM 200pF Channel 2 position detection monitor 11 CHOP 12 MONI 13 RST/BLK 14 STEP/DC22 15 FR/DC21 16 MD2/DC12 Logic input 17 MD1/DC11 18 DM 19 OE 20 ST -+ 1.5V 21 VREF 22 GND
OUT1A 44 OUT1A 43 PGND 42 NC 41 NC 40 VM1 39 VM1 38 RF1 37 RF1 36 OUT1B 35 OUT1B 34 OUT2A 33 OUT2A 32 RF2 31 RF2 30 VM2 29 M VM2 28 NC 27 NC 26 PGND 25 OUT2B 24 OUT2B 23 24V +-
M
100pF
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/5/0.3 = 1.0A Chopping frequency setting Fchop = Ichop/ (Cchop x Vtchop x 2) = 10A/ (200pF x 0.5V x 2) = 50kHz Timer latch time when the output is short-circuited Tcem = Ccem x Vtcem/Icem = 100pF x 1V/10A = 10s
LV8731V
No.A1482-25/26
LV8731V
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This catalog provides information as of December, 2009. Specifications and information herein are subject to change without notice. PS No.A1482-26/26

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