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3977 Datasheet

  • 3977

  • MICROSTEPPING DMOS DRIVER WITH TRANSLATOR

  • 18頁

  • ALLEGRO   ALLEGRO

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3977
A3977xED
(PLCC)
LOAD
SUPPLY
1
SENSE
1
ENABLE
OUT
1A
HOME
GND
GND
GND
SLEEP
OUT
1B
MICROSTEPPING DMOS DRIVER
WITH TRANSLATOR
The A3977xED and A3977xLP are complete microstepping motor drivers
with built-in translator. They are designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive capability of 35
V and 鹵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. By
simply inputting one pulse on the STEP input the motor will take one step
(full, half, quarter, or eighth depending on two logic inputs). 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
碌P 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,
under-voltage 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 copper batwing tabs (suffix ED), and a thin (<1.2 mm), 28-
pin TSSOP with an exposed thermal pad (suffix LP). The SLP package is
available in a lead-free version (100% matte tin leadframe).
Data Sheet
26184.22D
DIR
6
5
4
3
2
1
44
43
V
BB1
42
41
40
NC
NC
PFD
7
CHARGE PUMP
39 NC
38 CP
2
37 CP
1
36 V
CP
35 GND
34 GND
33 GND
REG
32
V
REG
8
9
PWM
TIMER
RC
1
10
GND 11
GND 12
GND 13
REF 14
RC
2
15
LOGIC
SUPPLY 16
NC 17
V
BB2
18
OUT
2A
TRANSLATOR
& CONTROL LOGIC
梅8
31 STEP
V
DD
30 NC
29 NC
19
MS
2
20
MS
1
21
SENSE
2
22
GND
23
GND
24
GND
25
SUPPLY
LOAD
2
26
SR
27
RESET
28
OUT
2B
Dwg. PP-075-1
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25擄C
Load Supply Voltage, V
BB
.............
35 V
Output Current, I
OUT
..................
鹵2.5 A
*
Logic Supply Voltage, V
DD
...........
7.0 V
Logic Input Voltage Range, V
IN
(t
w
>30 ns) .....
-0.3 V to V
DD
+ 0.3 V
(t
w
<30 ns) ...........
-1 V to V
DD
+ 1 V
Sense Voltage, V
SENSE
.................
0.5 V
Reference Voltage, V
REF
................
V
DD
Package Power Dissipation,
P
D
.................................
See page 3
Operating Temperature Range, T
A
(A3977Kx) ............
-40擄C to +125擄C
(A3977Sx) ..............
-20擄C to +85擄C
Junction Temperature, T
J
.........
+150擄C
Storage Temperature Range,
T
S
.........................
-55擄C to +150擄C
* Output current rating may be limited by
duty cycle, ambient temperature, and heat
sinking. Under any set of conditions, do not
exceed the specified current rating or a
junction temperature of 150擄C.
FEATURES
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鹵2.5 A, 35 V Output Rating
Low r
DS(on)
Outputs, 0.45
鈩?/div>
Source, 0.36
鈩?/div>
Sink Typical
Automatic Current Decay Mode Detection/Selection
3.0 V 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
Always order by complete part number:
Part Number
A3977KED
A3977KLP
A3977SED
A3977SED-T
A3977SLP
A3977SLP-T
Package
44-pin PLCC
28-pin TSSOP
44-pin PLCC
44-pin PLCC; Lead-free
28-pin TSSOP
28-pin TSSOP; Lead-free

3977 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 1 : ￥524.22000散裝

  • -

  • 散裝

  • 在售

  • 初級入門套件

  • 主板

  • -

  • Arduino IDE，Circuit Python，Microsoft MakeCode

  • ATSAMD21

  • Circuit Playground Express

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  • 英文版
    MICROSTEPPING DMOS DRIVER WITH TRANSLATOR
    ALLEGRO
  • 英文版
    MICROSTEPPING DMOS DRIVER WITH TRANSLATOR
    ALLEGRO [A...

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