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3973 PDF даташит

Спецификация 3973 изготовлена ​​​​«Allegro MicroSystems» и имеет функцию, называемую «DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER».

Детали детали

Номер произв 3973
Описание DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER
Производители Allegro MicroSystems
логотип Allegro MicroSystems логотип 

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3973 Даташит, Описание, Даташиты
3973
PRELIMINARY INFORMATION DUAL DMOS FULL-BRIDGE MICRO-
(Subject to change without notice)
December 1, 2000
STEPPING PWM MOTOR DRIVER
VCP 1
CP1 2
CP2 3
OUT1B 4
LOAD
SUPPLY1 5 VBB1
GROUND 6
GROUND 7
SENSE1 8
OUT1A 99
STROBE 10
CLOCK 11
DATA 12
24 OSC
23 SLEEP
22 VREG
21 OUT2B
20 LOAD
VBB2
SUPPLY2
19 GROUND
18 GROUND
17 SENSE2
16 OUT2A
VDD
15
LOGIC
SUPPLY
14 MUX
13 REF
Dwg. PP-069-3
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, VBB ................ 35 V
Output Current, IOUT ...................... ±1.0 A
Logic Supply Voltage, VDD .............. 7.0 V
Logic Input Voltage Range,
VIN ................ -0.3 V to VDD + 0.3 V
Reference Voltage, VREF ..................... 3 V
Sense Voltage (dc), VS ................ 500 mV
Package Power Dissipation, PD
A3973SB ............................... 3.1 W
A3973SLB ............................ 2.2 W
Operating Temperature Range,
TA .......................... -20°C to +85°C
Junction Temperature, TJ ............. +150°C
Storage Temperature Range,
TS ......................... -55°C to +150°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 tempera-
ture of 150°C.
Designed for pulse-width modulated (PWM) current control of
bipolar microstepping stepper motors, the A3973SB and A3973SLB are
capable of continuous output currents to ±1 A and operating voltages to
35 V. Internal fixed off-time PWM current-control timing circuitry can
be programmed via a serial interface to operate in slow, fast, and mixed
current-decay modes. The A3973SB (DIP) and the A3973SLB (SOIC)
are electrically identical and differ only in package style.
The desired load-current level is set via the serial port with two 6-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 rDS(on) of the DMOS output driver during the current
decay. This feature will eliminate the need for external clamp diodes in
most applications, saving cost and external component count, while
minimizing power dissipation.
Internal circuit protection includes thermal shutdown with hyster-
esis, transient-suppression diodes, and crossover-current protection.
Special power-up sequencing is not required.
The A3973SB is supplied in a 24-lead plastic DIP with a copper
batwing power tab; the A3973SLB is supplied in a 24-lead plastic SOIC
with a copper batwing power tab for surface-mount applications. The
power tabs are at ground potential and need no electrical isolation.
FEATURES
I ±1 A, 35 V Continuous Output Rating
I Low rDS(on) DMOS Output Drivers
I Optimized Microstepping via 6-Bit Linear DACs
I Programmable Mixed, Fast, and Slow Current-Decay Modes
I 4 MHz Internal Oscillator for Digital Timing
I Serial-Interface Controls Chip Functions
I Synchronous Rectification for Low Power Dissipation
I Internal UVLO and Thermal Shutdown Circuitry
I Crossover-Current Protection
I Precision 2 V Reference
I Inputs Compatible with 3.3 V or 5 V Control Signals
I Sleep and Idle Modes
Always order by complete part number, e.g., A3973SB .









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3973 Даташит, Описание, Даташиты
3973
DUAL DMOS FULL-BRIDGE
MICROSTEPPING PWM MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
0.22 µF
0.22 µF
LOGIC
SUPPLY
15
VDD
VREG
22
CP2
3
CP1
2
2V
UVLO AND
FAULT
REGULATOR
DETECT
BANDGAP
CHARGE PUMP
MUX 14
6-BIT
LINEAR
DAC
6
+-
SENSE1
DMOS H-BRIDGE
VCP
OSCILATOR
OSC
24 OSC SELECT/
DIVIDER
PROGRAMMABLE
PWM TIMER
FIXED-OFF
BLANK
MIXED DECAY
CLOCK 11
DATA 12
STROBE 10
SERIAL
PORT
SLEEP 23
CONTROL
LOGIC
PHASE 1/2
SYNC. RECT. MODE
SYNC. RECT. DISABLE
MODE 1/2
GATE
DRIVE
DMOS H-BRIDGE
PROGRAMMABLE
PWM TIMER
2 V FIXED-OFF
BLANK
6 MIXED DECAY
REF 13
BUFFER
6-BIT
LINEAR
DAC
Dwg. FP-050-1
+-
67
GROUND
18 19
VCP
1
VBB1
5
LOAD
SUPPLY
0.22 µF
OUT1A
9
OUT1B
4
SENSE1
8
20
VBB2
0.1 µF
OUT2A
16
OUT2B
21
SENSE2
17
0.1 µF
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, Allegro MicroSystems, Inc.









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3973 Даташит, Описание, Даташиты
3973
DUAL DMOS FULL-BRIDGE
MICROSTEPPING PWM MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 35 V, VDD = 5.0 V, VS = 0.5 V,
fPWM < 50 kHz (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min. Typ. Max.
Load Supply Voltage Range
VBB Operating
During sleep mode
15 — 35
0 — 35
Logic Supply Voltage Range
Load Supply Current
VDD Operating
IBB fPWM < 50 kHz
Operating, outputs disabled
4.5 5.0 5.5
— — 8.0
— — 6.0
Sleep or idle mode
— — 20
Logic Supply Current
IDD fPWM < 50 kHz
Outputs off
— — 12
— — 10
Idle mode (D0 = 1, D18 = 0)
— — 1.5
Sleep mode
— — 100
Output Drivers
Output Leakage Current
Output On Resistance
Body Diode Forward Voltage
Control Logic
IDSS
rDS(on)
VF
VOUT = VBB
VOUT = 0 V
Source driver, IOUT = –1.0 A
Sink driver, IOUT = 1.0 A
Source diode, IF = 1.0 A
Sink diode, IF = 1.0 A
— <1.0 50
— <-1.0 -50
— 0.54 0.60
— 0.54 0.60
— — 1.2
— — 1.2
Logic Input Voltage
Logic Input Current
OSC Input Frequency Range
VIN(1)
VIN(0)
IIN(1)
IIN(0)
fOSC
VIN = 2.0 V
VIN = 0.8 V
Divide by one
(D0 =1, D13 = 0, D14 = 1)
2.0 —
— — 0.8
— <1.0 20
— <-2.0 -20
2.5 — 6.0
OSC Input Duty Cycle
40 — 60
Input Hysterisis
VIN
0.20 — 0.40
Units
V
V
V
mA
mA
µA
mA
mA
mA
µA
µA
µA
V
V
V
V
µA
µA
MHz
%
V
continued next page ...
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