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PDF LV8731V Data sheet ( Hoja de datos )
| Número de pieza | LV8731V | |
| Descripción | PWM Current Control Stepping Motor Driver | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Ordering number : ENA1482A
LV8731V
Bi-CMOS LSI
PWM Constant-Current Control
Stepping Motor Driver
Overview
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 : 0.3Ω ; lower side : 0.25Ω ; total of upper and lower : 0.55Ω ; Ta = 25°C, 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 = 25°C
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
Conditions
tw ≤ 10ms, duty 20%
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
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1 page  
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Pin Assignment
LV8731V
VG 1
VM 2
CP2 3
CP1 4
VREG5 5
ATT2 6
ATT1 7
EMO 8
CEM 9
EMM 10
CHOP 11
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
LV8731V
Top view
44 OUT1A
43 OUT1A
42 PGND
41 NC
40 NC
39 VM1
38 VM1
37 RF1
36 RF1
35 OUT1B
34 OUT1B
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
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
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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
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
0.3Ω, the output current is set as shown below.
IOUT = 1.5V/5 × 100%/0.3Ω = 1.0A
If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows :
IOUT = 1.0A × 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 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.A1482-11/26
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| Páginas | Total 26 Páginas | |
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