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A3977XLP Datasheet

  • A3977XLP

  • Microstepping DMOS Driver with Translator

  • 18頁

  • ETC

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3977
PRELIMINARY INFORMATION
(Subject to change without notice)
February 27, 2003
A3977xED
(PLCC)
LOAD
SUPPLY
1
SENSE
1
SLEEP
OUT
1A
ENABLE
HOME
GND
GND
44
GND
DIR
41
43
42
40
2
4
6
5
3
1
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.
Data Sheet
26184.22
V
BB1
NC
NC
PFD
RC
1
7
39
NC
CP
2
CP
1
V
CP
GND
GND
GND
V
REG
STEP
NC
NC
8
9
10
CHARGE PUMP
38
37
36
35
34
33
PWM
TIMER
GND
11
GND
12
GND
13
REF
14
梅8
TRANSLATOR
& CONTROL LOGIC
REG
32
31
RC
2
15
LOGIC
SUPPLY
16
NC
17
V
BB2
V
DD
30
29
18
MS
1
20
21
GND
22
23
LOAD
SUPPLY
2
25
24
MS
2
19
26
SENSE
2
RESET
27
OUT
2A
OUT
2B
28
GND
GND
SR
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
(A3977Ex) ..............
-40
擄
C to +85
擄
C
(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.
Internal circuit protection includes thermal shutdown with hyster-
esis, 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-
lead plastic PLCC with copper batwing tabs (suffix ED), and a thin
(<1.2 mm), 28-lead TSSOP with an exposed thermal pad (suffix LP).
FEATURES
s
s
s
s
s
s
s
s
s
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: the prefix 鈥楢鈥?+ the basic part number
(3977) + a suffix letter to indicate operating temperature range + a two-letter
suffix to indicate package style, e.g.,
A3977SLP
.

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