Ordering number : ENA1998
LV8727
Bi-CMOS LSI
PWM Current Control
Stepping Motor Driver
Overview
http://onsemi.com
The LV8727 is a PWM current-controlled micro step bipolar stepping motor driver. This driver can do eight ways of
micro step resolution of Half, 1/8, 1/16, 1/32, 1/64, 1/128, 1/10, 1/20 Step, and can drive simply by the step input.
Features
•
Single-channel PWM current control stepping motor driver.
•
Output on-resistance (upper side : 0.25Ω ; lower side : 0.15Ω ; total of upper and lower : 0.4Ω ; Ta = 25°C, IO = 4.0A)
•
Half, 1/8, 1/16, 1/32, 1/64, 1/128, 1/10, 1/20 Step are selectable.
•
Advance the excitation step with the only step signal input.
•
BiCDMOS process IC.
•
Available forward reverse control.
•
IO max=4.0A
•
Thermal shutdown circuit.
•
Input pull down resistance
•
With reset pin and enable pin.
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Supply voltage
Output current
Output peak current
Logic input voltage
VREF input voltage
MO / DOWN pin input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VM max
IO max
IO peak
VIN max
VREF max
VMO /VDOWN max
Pd max
Topr
Tstg
Indipendent IC
tw≤10ms, duty 20%
Conditions
Ratings
50
4
4.6
6
6
6
2.45
-30 to +85
-55 to +150
Unit
V
A
A
V
V
V
W
°C
°C
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.
Semiconductor Components Industries, LLC, 2013
June, 2013
N1611 SY 20111019-S00003 No.A1998-1/23
LV8727
Recommendation Operating Ratings
at Ta = 25°C
Parameter
Supply voltage range
Logic input voltage
VREF input voltage range
Symbol
VM
VIN
VREF
Conditions
Ratings
9 to 45
0 to 5
0 to 3
Unit
V
V
V
Electrical Characteristics
at Ta = 25°C, VM = 24V, VREF = 1.5V
Parameter
Standby mode current drain
Current drain
Thermal shutdown temperature
Thermal hysteresis width
Logic pin input current
Symbol
IMst
IM
TSD
ΔTSD
IINL
IINH
Logic high-level input voltage
Logic low-level input voltage
FDT pin high-level voltage
FDT pin middle-level voltage
FDT pin low-level voltage
Chopping frequency
OSC1 pin charge/discharge current
Chopping oscillation circuit
threshold voltage
VREF pin input voltage
DOWN output residual voltagr
MO pin residual voltage
Hold current switching frequency
OSC2 pin charge/discharge current
Hold current switching frequency
threshold voltage
Output on-resistance
VINH
VINL
Vfdth
Vfdtm
Vfdtl
Fch
Iosc1
Vtup1
Vtdown1
Iref
VO1DOWN
VO1MO
Fdown
Iosc2
Vtup2
Vtdown2
Ronu
Rond
Output leakage current
Diode forward voltage
Current setting reference voltage
IOleak
VD
VRF
IO = 4.0A, high-side ON resistance
IO = 4.0A, low-side ON resistance
VM = 50V
ID = -4.0A
VREF = 1.5V, Current ratio 100%
0.485
1
0.5
VREF = 1.5V
Idown = 1mA
Imo = 1mA
Cosc2 = 1500pF
1.12
7
0.8
0.3
Cosc1 = 100pF
70
7
0.8
0.3
-0.5
50
50
1.6
10
1
0.5
0.25
0.15
200
200
2.08
13
1.2
0.7
0.325
0.195
50
1.3
0.515
100
10
1
0.5
3.5
1.1
3.1
0.8
130
13
1.2
0.7
ST = “L”
ST = “H”, OE = “H”, no load
Design guarantee
Design guarantee
VIN = 0.8V
VIN = 5V
3
30
2.0
0.8
150
Conditions
Ratings
min
typ
70
3.5
180
40
8
50
15
70
max
100
4.9
200
Unit
μA
mA
°C
°C
μA
μA
V
V
V
V
V
kHz
μA
V
V
μA
mV
mV
Hz
μA
V
V
Ω
Ω
μA
V
V
No.A1998-2/23
LV8727
Package Dimensions
unit : mm (typ)
3236A
29.2
25.6
(22.8)
(8.5)
( 2.5)
4.5
(12.3)
(5.0)
(R1.7)
18.6 max
(14.4)
(11.0)
21.7
0.4
1
(2.6)
(1.0)
0.52
25
3.5
4.0
4.2
2.0
2.0
SANYO : HZIP25
3.0
Pd max
-
Ta
Allowable power dissipation, Pd max - W
2.45
2.0
1.27
1.0
0
—
30
0
30
60
90
120
Ambient temperature, Ta - C
14.5
No.A1998-3/23
Block Diagram
+
-
RF1
OUT1A
OUT2B
OUT1B VM1
VM2 OUT2A
RF2
Regulator 2
PGND1
PGND2
Output pre stage
Output pre stage
Output pre stage
Output pre stage
MO
DOWN
Regulator 1
-
+
VREF
+
-
Oscllator
TSD
Current
select
circuit
Output control logic
-
+
Current
select
circuit
Decay Mode
setting circuit
LV8727
SGND
ST
OSC2
MD1
MD2
MD3
FR
STEP RST OE
FDT
OSC1
No.A1998-4/23
LV8727
Pin Assignment
LV8727
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
VM1
PGND1
OUT1B
MD1
RF1
OUT2B
PGND2
OUT1A
Top view
Pin Functions
Pin No.
7
8
9
10
11
12
13
Pin Name
MD1
MD2
MD3
OE
RST
FR
STEP
Pin Functtion
Excitation mode switching pin
Excitation mode switching pin
Excitation mode switching pin
Output enable signal input pin
Reset signal input pin
Forward / Reverse signal input pin
Clock pulse signal input pin
Internal 5V
regulator
Equivalent Circuit
GND
6
ST
Chip enable input pin.
Internal 5V
regulator
GND
1
2
3
4
5
21
22
23
24
25
OUT1B
RF1
PGND1
OUT1A
VM1
VM2
OUT2B
PGND2
RF2
OUT2A
Channel 1 OUTB output pin.
Channel 1 current-sense resistor connection pin.
Channel 1 power GND
Channel 1 OUTA output pin.
Channel 1 motor supply connect pin
Channel 2 motor supply connect pin
Channel 2 OUTB output pin.
Channel 2 power GND
Channel 2 current-sense resistor connection pin.
Channel 2 OUTA output pin.
4 25
5 21
1 22
3 23
2 24
GND
Continued on next page.
No.A1998-5/23
OUT2A
OSC1
DOWN
VREF
MD2
MD3
SGND
OSC2
STEP
RST
VM2
FDT
RF2
MO
OE
FR
ST
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