A3984 查看數據表（PDF） - Allegro MicroSystems
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A3984 Datasheet PDF : 12 Pages
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A3984
DMOS Microstepping Driver with Translator
Description (continued)
initially to a fast decay for a period amounting to 31.25% of
the fixed off-time, then to a slow decay for the remainder of the
off-time). This current decay control scheme results in reduced
audible motor noise, increased step accuracy, and reduced power
dissipation.
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-on sequencing is not required.
The A3984 is supplied in a low-profile (1.2 mm maximum),
24-pin TSSOP with exposed thermal pad (package LP). It is lead
(Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
A3984SLPTR-T
Packing
4000 pieces per 13-in. reel
Absolute Maximum Ratings
Characteristic
Load Supply Voltage
Output Current
Logic Input Voltage
Sense Voltage
Reference Voltage
Operating Ambient Temperature
Maximum Junction
Storage Temperature
Symbol
VBB
IOUT
VIN
VSENSE
VREF
TA
TJ(max)
Tstg
Notes
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 tem-
perature of 150°C.
Range S
THERMAL CHARACTERISTICS
Characteristic
Symbol
Package Thermal Resistance
RθJA
Test Conditions*
4-layer PCB, based on JEDEC standard
*Additional thermal information available on Allegro Web site.
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
20
Maximum Power Dissipation, PD(max)
(R
θJA = 28 ºC/W)
40 60 80 100 120 140 160 180
Temperature (°C)
Rating
35
Units
V
±2
A
–0.3 to 7
V
0.5
V
4
V
–20 to 85
ºC
150
ºC
–55 to 150
ºC
Value Units
28 ºC/W
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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