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PDF A3977 Data sheet ( Hoja de datos )
| Número de pieza | A3977 | |
| Descripción | Microstepping DMOS Driver | |
| Fabricantes | Allegro | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A3977 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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A3977
Microstepping DMOS Driver with Translator
Features and Benefits
▪ ±2.5 A, 35 V output rating
▪ Low rDS(on) outputs, 0.45 Ω source, 0.36 Ω sink typical
▪ Automatic current decay mode detection/selection
▪ 3.0 to 5.5 V logic supply voltage range
▪ Mixed, fast, and slow current decay modes
▪ Home output
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO and thermal shutdown circuitry
▪ Crossover-current protection
Packages:
Package ED, 44-pin PLCC
with internally fused pins
Package LP, 28-pin TSSOP
with exposed thermal pad
Not to scale
Description
TheA3977 is a complete microstepping motor driver, with built-
in translator. It is designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive
capability of 35 V and ±2.5 A. The A3977 includes a fixed
off-time current regulator that has the ability to operate in
slow-, fast-, or mixed-decay modes. This current-decay control
scheme results in reduced audible motor noise, increased step
accuracy, and reduced power dissipation.
The translator is the key to the easy implementation of the
A3977. Simply inputting one pulse on the STEPinput drives the
motor one step (two logic inputs determine if it is a full-, half-,
quarter-, or eighth-step). There are no phase-sequence tables,
high-frequency control lines, or complex interfaces to program.
The A3977 interface is an ideal fit for applications where a
complex microprocessor is unavailable or over-burdened.
Internal synchronous-rectification control circuitry is provided
to improve power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage lockout (UVLO) and crossover-current
protection. Special power-up sequencing is not required.
The A3977 is supplied in a choice of two power packages, a
44-pin plastic PLCC with 3 internally-fused pins on each of
four sides (suffix ED), and a thin (<1.2 mm), 28-pin TSSOP
with an exposed thermal pad (suffix LP). Both packages are
lead (Pb) free, with 100% matte tin leadframe plating.
Pin-out Diagram
26184.22K
NC 7
6 5 4 3 2 1 44 43 42 41 40
VBB1
NC 8
PFD 9
RC1 10
PWM
TIMER
GND 11
GND 12
GND 13
REF 14
÷8
REG
RC2 15
LOGIC
SUPPLY
16
VDD
NC 17
VBB2
18 19 20 21 22 23 24 25 26 27 28
39 NC
38 CP2
37 CP1
36 VCP
35 GND
34 GND
33 GND
32 VREG
31 STEP
30 NC
29 NC
Dwg. PP-075-1
Free Datasheet http://www.Datasheet4U.com
1 page  
A3977
Microstepping DMOS Driver with Translator
ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 35 V, VDD = 3.0 V to 5.5V (unless otherwise noted)
Characteristic
Symbol
Test Conditions
Min.
Output Drivers
Load Supply Voltage Range
Output Leakage Current
Output On Resistance
Body Diode Forward Voltage
Motor Supply Current
VBB
IDSS
rDS(on)
VF
IBB
Operating
During sleep mode
VOUT = VBB
VOUT = 0 V
Source driver, IOUT = -2.5 A
Sink driver, IOUT = 2.5 A
Source diode, IF = -2.5 A
Sink diode, IF = 2.5 A
fPWM < 50 kHz
Operating, outputs disabled
Sleep mode
8.0
0
–
–
–
–
–
–
–
–
–
Control Logic
Logic Supply Voltage Range
Logic Input Voltage
Logic Input Current
Maximum STEP Frequency
HOME Output Voltage
Blank Time
Fixed Off Time
Mixed Decay Trip Point
VDD
VIN(1)
VIN(0)
IIN(1)
IIN(0)
fSTEP
VOH
VOL
tBLANK
toff
PFDH
PFDL
Operating
VIN = 0.7VDD
VIN = 0.3VDD
IOH = -200 μA
IOL = 200 μA
Rt = 56 kΩ, Ct = 680 pF
Rt = 56 kΩ, Ct = 680 pF
3.0
0.7VDD
–
-20
-20
500*
0.7VDD
–
700
30
–
–
Ref. Input Voltage Range
Reference Input Current
Gain (Gm) Error (note 3)
Crossover Dead Time
VREF
IREF
EG
tDT
Operating
VREF = 2 V, Phase Current = 38.27%
VREF = 2 V, Phase Current = 70.71%
VREF = 2 V, Phase Current = 100.00%
SR enabled
0
–
–
–
–
100
Typ.
–
–
<1.0
<1.0
0.45
0.36
–
–
–
–
–
5.0
–
–
<1.0
<1.0
–
–
–
950
38
0.6VDD
0.21VDD
–
0
–
–
–
475
Max.
35
35
20
-20
0.57
0.43
1.4
1.4
8.0
6.0
20
5.5
–
0.3VDD
20
20
–
–
0.3VDD
1200
46
–
–
VDD
±3.0
±10
±5.0
±5.0
800
Units
V
V
μA
μA
Ω
Ω
V
V
mA
mA
μA
V
V
V
μA
μA
kHz
V
V
ns
μs
V
V
V
μA
%
%
%
ns
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
Free Datasheet http://www.Datasheet4U.com
5 Page 
A3977
Microstepping DMOS Driver with Translator
Table 2. Step Sequencing
(DIR = L)
Full
Step #
1
2
3
4
Half
Step #
1
2
3
4
5
6
7
8
Quarter
Step #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
* Home state; HOME output low.
Eighth
Step #
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
26
27
28
29
30
31
32
Phase 2
Current
[%Itripmax]
0.00
19.51
38.27
55.56
70.71
83.15
92.39
98.08
100.00
98.08
92.39
83.15
70.71
55.56
38.27
19.51
0.00
-19.51
-38.27
-55.56
-70.71
-83.15
-92.39
-98.08
-100.00
-98.08
-92.39
-83.15
-70.71
-55.56
-38.27
-19.51
Phase 1
Current
[%Itripmax]
100.00
98.08
92.39
83.15
70.71
55.56
38.27
19.51
0.00
-19.51
-38.27
-55.56
-70.71
-83.15
-92.39
-98.08
-100.00
-98.08
-92.39
-83.15
-70.71
-55.56
-38.27
-19.51
0.00
19.51
38.27
55.56
70.71
83.15
92.39
98.08
Step
Angle
0
11.25
22.50
33.75
45*
56.25
67.50
78.75
90
101.25
112.50
123.75
135
146.25
157.50
168.75
180
191.25
202.50
213.75
225
236.25
247.50
258.75
270
281.25
292.50
303.75
315
326.25
337.50
348.75
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet A3977.PDF ] | |
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