A3992SBT- Allegro MicroSystems, Inc., A3992SBT- Datasheet

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A3992SBT-

Manufacturer Part Number
A3992SBT-
Description
DMOS Dual Full-Bridge Microstepping PWM Motor Driver
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
Features and Benefits
▪ ±1.5 A, 50 V continuous output rating
▪ Low R
▪ Short-to-ground protection
▪ Shorted load protection
▪ Optimized microstepping via six bit linear DACs
▪ Programmable mixed, fast, and slow current decay modes
▪ 4 MHz internal oscillator for digital timing
▪ Serial interface controls chip functions
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO and thermal shutdown circuitry
▪ Crossover-current protection
▪ Inputs compatible with 5 or 3.3 V control signals
▪ Sleep and Idle modes
Packages
3992DS
24 pin batwing DIP (suffi x B) and 24 pin TSSOP with
exposed thermal pad (suffi x LP)
DMOS Dual Full-Bridge Microstepping PWM Motor Driver
LP package approximate scale
DS(on)
DMOS output drivers
Microcontroller or
Controller Logic
10 μF
5 kΩ
Typical Application
VDD
ROSC
CLOCK
DATA
STROBE
REF
SLEEP
VREG
0.22 μF
Description
Designed for pulse width modulated (PWM) current control of
bipolar microstepped stepper motors, the A3992 is capable of
continuous output currents to ±1.5 A and operating voltages to
50 V. Internal fixed off-time PWM current control timing circuitry
can be programmed via the serial interface to operate in slow, fast,
or mixed decay modes.
The desired load current level is set via the serial port with two
six bit linear DACs in conjunction with a reference voltage. The
six bits of control allow maximum flexibility in torque control for
a variety of step methods, from microstepping to full step drive.
Load current is set in 1.56% increments of the maximum value.
Synchronous rectification circuitry allows the load current to flow
through the low R
decay. This feature eliminates the need for external clamp diodes
in most applications, saving cost and external component count,
while minimizing power dissipation.
Internal circuit protection includes short-to-ground, shorted load,
thermal shutdown with hysteresis, and crossover current protection.
Special power up sequencing is not required.
The A3992 is supplied in a thin profile (1.2 mm maximum height)
24 pin TSSOP (suffix LP) with exposed thermal pad and a 24 pin
plastic DIP with dual copper batwing tabs (suffix B). The exposed
thermal pad on the LP is at ground potential and needs no electrical
isolation. Both packages are lead (Pb) free with 100% matte tin
leadframe plating.
A3992
CP1
0.22 μF
SENSE1
SENSE2
OUT1B
OUT2B
OUT1A
OUT2A
CP2
VBB1
VBB2
VCP
DS(on)
of the DMOS output driver during current
0.22 μF
0.1 μF
100 μF
0.1 μF
A3992

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A3992SBT- Summary of contents

Page 1

DMOS Dual Full-Bridge Microstepping PWM Motor Driver Features and Benefits ▪ ±1 continuous output rating ▪ Low R DMOS output drivers DS(on) ▪ Short-to-ground protection ▪ Shorted load protection ▪ Optimized microstepping via six bit linear DACs ...

Page 2

... 500 – 150 –55 to 150 Notes Rating Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Units ºC ºC ºC Units °C/W °C/W °C/W ° ...

Page 3

... Mode 1, 2 Programmable PWM Timer Fixed-Off Blank Mixed Decay DMOS Dual Full-Bridge 0.22 µF CP1 VCP Charge Pump 0.22 µF VBB1 >47 µF OUT1A OUT1B SENSE1 VBB2 OUT2A OUT2B SENSE2 0.1 µF Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 3 ...

Page 4

... Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Units μA –50 μA 0.6 Ω 0.6 Ω 1 μA ...

Page 5

... This bit determines the reference D18 determines if the scaling Range Select. Divider Load Current ÷ /(R I TRIP DAC ÷ /(R I TRIP DAC Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com × 8) SENSE × 4) SENSE 5 ...

Page 6

... OSC 2 bits to set timing D12 Source and Rate 0 Internal clock 4 MHz 1 External clock f ÷ External clock f ÷ External clock f ÷ 4 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 6 ...

Page 7

... The device can be put into the low- The PWM timer is based on an oscillator to further improve the tolerance. The 204 × OSC OSC . Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com OSC 7 ...

Page 8

... DMOS Dual Full-Bridge Should a motor winding short to During a shorted load event, the cur μs off div. 5 μs / div. (B) Short-to-load event Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 8 ...

Page 9

... H. Minimum Sleep to Clock Setup Time Setup “Idle” Release to Output Enable 40 ns DMOS Dual Full-Bridge . Circuitry turns off all drivers Data is clocked F G LSB - 120 ns 50 μ Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 9 ...

Page 10

... CLOCK CP1 PAD CVCP DATA VCP GND GND ROSC REF OSC MUX SLEEP CREG VDD VREG OUT2A OUT2B SENSE2 VBB2 RS2 CVDD OUT2A OUT2B Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com V BB CVBB2 CVBB1 10 ...

Page 11

... CP2 STROBE 4 20 CP1 CLOCK 5 VCP 19 DATA 6 PAD 18 GND GND 7 17 OSC REF 8 SLEEP 16 MUX 9 15 VREG VDD 10 14 OUT2B OUT2A 11 VBB2 13 SENSE2 12 Pin Description Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 11 ...

Page 12

... MIN .100 .2.54 .150 3.81 .115 2.92 .022 .056 24X .014 .036 .010 [0.25 DMOS Dual Full-Bridge .014 0.36 .008 0.20 .430 10.92 .300 .7.62 MAX C .210 5.33 SEATING MAX PLANE Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 12 ...

Page 13

... Allegro products are not authorized for use as critical components in life-support devices or sys tems without express written approval. The in for ma tion in clud ed herein is believed rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. ...

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