A3986 Datasheet PDF - Allegro MicroSystems

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A3986
Allegro MicroSystems

Part Number A3986
Description Dual Full-Bridge MOSFET Driver
Page 16 Pages


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A3986
Dual Full-Bridge MOSFET Driver
with Microstepping Translator
Features and Benefits
2-wire step and direction interface
Dual full-bridge gate drive for N-channel MOSFETs
Operation over 12 to 50 V supply voltage range
Synchronous rectification
Cross-conduction protection
Adjustable mixed decay
Integrated sinusoidal DAC current reference
Fixed off-time PWM current control
Package: 38 pin TSSOP (suffix LD)
Description
The A3986 is a dual full-bridge gate driver with integrated
microstepping translator suitable for driving a wide range of
higher power industrial bipolar 2-phase stepper motors (typically
30 to 500 W). Motor power is provided by external N-channel
power MOSFETs at supply voltages from 12 to 50 V.
This device contains two sinusoidal DACs that generate the
reference voltage for two separate fixed-off-time PWM current
controllers.These provide current regulation for external power
MOSFET full-bridges.
Motor stepping is controlled by a two-wire step and direction
interface, providing complete microstepping control at full-,
half-, quarter-, and sixteenth-step resolutions. The fixed-off
time regulator has the ability to operate in slow-, mixed-, or
fast-decay modes, which results in reduced audible motor noise,
increased step accuracy, and reduced power dissipation.
The translator is the key to the easy implementation of this
IC. Simply inputting one pulse on the STEP input drives the
motor one step (full, half, quarter, or sixteenth depending on
the microstep select input). There are no phase-sequence tables,
high frequency control lines, or complex interfaces to program.
This reduces the need for a complex microcontroller.
Approximate size
Continued on the next page…
Typical Application Diagram
3986-DS, Rev. 1



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A3986
Dual Full-Bridge MOSFET Driver
with Microstepping Translator
Description (continued)
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 an 38-pin TSSOP (package LD). The
package is lead (Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
A3986SLD-T
Packing*
Tube, 50 pieces per tube
A3986SLDTR-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
–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



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A3986
Dual Full-Bridge MOSFET Driver
with Microstepping Translator
+5 V
VDD
Bandgap
REF
VREF
STEP
DIR
MS1
MS2
PFD1
PFD2
ENABLE
RESET
SR
Translator
OSC
ROSC
Protection
UVLO
TSD
Functional Block Diagram
VBB
Regulator
VREG
DAC
PWM Latch
Blanking
Mixed Decay
Phase 1
Control Logic
Phase 1
Phase 2
Control Logic
Phase 2
PWM Latch
Blanking
Mixed Decay
DAC
VREF
VMOTOR
VREG
CREG
Phase 1A
High-Side
Drive
VREG
Low-Side
Drive
C1A
CBOOT1A
GH1A
S1A
RGH1A
GL1A
LSS1
RGL1A
P
Bridge1
RGH1B
RGL1B
Phase 1B
Low-Side
Drive
SENSE1
GL1B
S1B
RSENSE1
P
High-Side
Drive
Phase 2A
High-Side
Drive
VREG
Low-Side
Drive
GH1B
CBOOT1B
C1B
C2A
VMOTOR
Bridge2
CBOOT2A
GH2A
S2A
RGH2A
RGH2B
GL2A
LSS2
RGL2A
RGL2B
Phase 2B
Low-Side
Drive
SENSE2
GL2B
S2B
RSENSE2
P
High-Side
Drive
GH2B
CBOOT2B
C2B
GND
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com



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A3986
Dual Full-Bridge MOSFET Driver
with Microstepping Translator
ELECTRICAL CHARACTERISTICS at TA = 25°C, VDD = 5 V, VBB = 12 to 50V, unless noted otherwise
Characteristics
Symbol
Test Conditions
Min. Typ.
Supply and Reference
Load Supply Voltage Range
Load Supply Current
Load Supply Idle Current
Logic Supply Voltage Range
Logic Supply Current
Logic Supply Idle Current
Regulator Output
Bootstrap Diode Forward Voltage
Gate Output Drive
Turn-On Rise Time
Turn-Off Fall Time
Turn-On Propagation Delay
Turn-Off Propagation Delay
Crossover Dead Time
Pull-Up On Resistance
Pull-Down On Resistance
Short-Circuit Current – Source1
Short-Circuit Current – Sink
GHx Output Voltage
GLx Output Voltage
VBB
IBB
IBBQ
VDD
IDD
IDDQ
VREG
VfBOOT
ROSC = 10 kΩ, CLOAD = 1000 pF
ENABLE = High, outputs disabled
RESET = 0
RESET = 0
IREGInt = 30 mA
IfBOOT = 10 mA
tr
tf
tp(on)
tp(off)
tDEAD
RDS(on)UP
RDS(on)DN
ISC(source)
ISC(sink)
VGHx
CLOAD = 1000 pF, 20% to 80%
CLOAD = 1000 pF, 80% to 20%
ENABLE low to gate drive on
ENABLE high to gate drive off
ROSC = 10 kΩ,
IGH = –25 mA
IGL = 25 mA
CBOOTx fully charged
VGLx
12
3.0
11.25
0.6
0.8
80
40
0.6
30
14
–140
160
VC – 0.2
VREG
0.2
120
60
180
180
40
19
–110
200
Logic Inputs
Input Low Voltage
Input High Voltage
Input Hysteresis
Input Current1
RESET Pulse Width2
VIL
VIH
VIHys
IIN
twR
0.7 VDD
150
–1
0.2
300
Max. Units
50 V
10 mA
6 mA
100 μA
5.5 V
10 mA
300 μA
13 V
1V
160 ns
80 ns
– ns
– ns
1.2 μs
55 Ω
24 Ω
–80 mA
250 mA
–V
–V
0.3 VDD
1
1
V
V
mV
μA
μs
Continued on the next page...
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com



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