http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf





Allegro MicroSystems
Allegro MicroSystems

A3985 Datasheet Preview

A3985 Datasheet

Digitally Programmable Dual Full-Bridge MOSFET Driver

No Preview Available !

A3985 pdf
www.DataSheet4U.com
A3985
Digitally Programmable
Dual Full-Bridge MOSFET Driver
Features and Benefits
Serial interface for full digital control
Dual full-bridge gate drive for N-channel MOSFETs
Dual 6-bit DAC current reference
Operation over 12 to 50 V supply voltage range
Synchronous rectification
Cross-conduction protection
Adjustable mixed decay
Fixed off-time PWM current control
Low-current idle mode
Package: 38 pin TSSOP (suffix LD)
Description
The A3985 is a flexible dual full-bridge gate driver suitable
for driving a wide range of higher power industrial bipolar 2-
phase stepper motors or 2-phase brushless dc motors. It can
also be used to drive two individual torque motors or solenoid
actuators. Motor power is provided by external N-channel power
MOSFETs at supply voltages from 12 to 50 V.
Full digital control is provided by two serially-accessible
registers that allow programming of off-time, blank-time,
dead-time, mixed decay ratios, synchronous rectification,
master clock source selection, and division ratio and idle
mode. All internal timings are derived from a master clock
that can be generated on-chip or provided by an external
clock such as the system clock of the master controller. A
programmable divider allows for a wide range of external
system clock frequencies.
The internal fixed off-time PWM current-control timing is
programmed via the serial interface to operate in slow, fast,
and mixed current-decay modes. The desired load-current level
and direction is set via the serial port with a direction bit and
two 6-bit linear DACs in conjunction with a reference voltage.
The seven bits of control allow maximum flexibility in torque
Approximate size
Continued on the next page…
Typical Application
3985-DS



Allegro MicroSystems
Allegro MicroSystems

A3985 Datasheet Preview

A3985 Datasheet

Digitally Programmable Dual Full-Bridge MOSFET Driver

No Preview Available !

A3985 pdf
A3985
Digitally Programmable
Dual Full-Bridge MOSFET Driver
Description (continued)
control for a variety of step methods, from microstepping to full-step
drive. Load current in the external power MOSFET full-bridges is
set in 1.56% increments of the maximum value.
The above-supply voltage required for the high-side N-channel
MOSFETs is provided by a bootstrap capacitor. Efficiency is
enhanced by using synchronous rectification and the power FETs
are protected from shoot-through by integrated crossover-control
and programmable dead time.
In addition to crossover current control, internal circuit protection
provides thermal shutdown with hysteresis and undervoltage lockout.
Special power-up sequencing is not required. This component is
supplied in a 38-pin TSSOP (package LD) with 100% matte tin
leadframe plating.
Selection Guide
Part Number
A3985SLD-T
Packing*
Tube, 50 pieces per tube
A3985SLDTR-T
Tape and reel, 4000 pieces per reel
*Contact Allegro for additional packing options
Absolute Maximum Ratings
Characteristic
Supply Voltage
Logic Supply Voltage
Logic Inputs and Outputs
SENSEx pins
Sxx pins
LSSx pins
GHxx pins
GLxx pins
Cxx pins
Operating Ambient Temperature
Junction Temperature
Storage Temperature
Symbol
VBB
VDD
TA
TJ(max)
Tstg
Range S
Notes
Rating
–0.3 to 50
–0.3 to 7
–0.3 to 7
–1 to 1
–2 to 55
–2 to 5
Sxx to Sxx+15
–2 to 16 V
–0.3 to Sxx+15
–20 to 85
150
–55 to 150
Units
V
V
V
V
V
V
V
V
V
ºC
ºC
ºC
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number A3985
Description Digitally Programmable Dual Full-Bridge MOSFET Driver
Maker Allegro MicroSystems
Total Page 15 Pages
PDF Download
A3985 pdf
Download PDF File
A3985 pdf
View for Mobile






Related Datasheet

1 A3980 Automotive DMOS Microstepping Driver with Translator Allegro MicroSystems
Allegro MicroSystems
A3980 pdf
2 A3980KLP Automotive DMOS Microstepping Driver with Translator Allegro MicroSystems
Allegro MicroSystems
A3980KLP pdf
3 A3982 DMOS Stepper Motor Driver Allegro
Allegro
A3982 pdf
4 A3983 DMOS Microstepping Driver Allegro MicroSystems
Allegro MicroSystems
A3983 pdf
5 A3984 DMOS Microstepping Driver Allegro MicroSystems
Allegro MicroSystems
A3984 pdf
6 A3985 Digitally Programmable Dual Full-Bridge MOSFET Driver Allegro MicroSystems
Allegro MicroSystems
A3985 pdf
7 A3986 Dual Full-Bridge MOSFET Driver Allegro MicroSystems
Allegro MicroSystems
A3986 pdf
8 A3987 DMOS Microstepping Driver Allegro MicroSystems
Allegro MicroSystems
A3987 pdf
9 A3988 Quad DMOS Full Bridge PWM Motor Driver Allegro MicroSystems
Allegro MicroSystems
A3988 pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components