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PDF LV8736V Data sheet ( Hoja de datos )
| Número de pieza | LV8736V | |
| Descripción | PWM Constant-Current Control Stepper Motor Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA1785C
LV8736V
Monolithic Linear IC
PWM Constant-Current Control
Stepper Motor Driver
http://onsemi.com
Overview
The LV8736V is a 2-channel H-bridge driver IC that can switch a stepper motor driver, which is capable of micro-step
drive and supports 1/8 step excitation, and two channels of a brushed motor driver, which supports forward, reverse,
brake, and standby of a motor. It is ideally suited for driving brushed DC motors and stepper motors used in office
equipment and amusement applications.
Function
• Single-channel PWM current control stepper 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 Full step, Half step, Quarter step , or 1/8 step
• 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
Conditions
Ratings
Unit
Supply voltage
VM max
VM , VM1 , VM2
36 V
Output peak current
Output current
Logic input voltage
IO peak
IO max
VIN max
tw ≤ 10ms , duty 20% Per 1ch
Per 1ch
ST , DM , STEP/DC22 , FR/DC21 ,
MD2/DC12 , ATT1 , ATT2 , EMM ,
RST/BLK , OE/CMK
1.5
1
-0.3 to +6
A
A
V
MONI/EMO input voltage
Vmo/Vemo
-0.3 to +6
V
Allowable power dissipation
Pd max
*
3.05
W
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
* Specified circuit board : 90.0mm×90.0mm×1.6mm, glass epoxy 2-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.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ORDERING INFORMATION
See detailed ordering and shipping information on page 26 of this data sheet.
Semiconductor Components Industries, LLC, 2013
June, 2013
61913NK / 42413NK 20130115-S00005 No.A1785-1/26
1 page  
Pin Assignment
LV8736V
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/CMK 19
ST 20
VREF 21
GND 22
LV8736V
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.A1785-5/26
5 Page 
LV8736V
2-4) 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
0.5Ω, the output current is set as shown below.
IOUT = 1.5V/5 × 100%/0.5Ω = 0.6A
If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows :
IOUT = 0.6A × 20% = 120mA
In this way, the output current is attenuated when the motor holding current is supplied so that power can
be conserved.
2-5) Input timing
TstepH TstepL
STEP
MD1
MD2
Tds Tdh
(md1 step) (step md1)
Tds Tdh
(md2 step) (step md2)
Tds Tdh
(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)
2-6) 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 stepper 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.A1785-11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LV8736V.PDF ] | |
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