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3973 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer 3973
Beschreibung DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
3973 Datasheet, Funktion
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 .






3973 Datasheet, Funktion
3973
DUAL DMOS FULL-BRIDGE
MICROSTEPPING PWM MOTOR DRIVER
FUNCTIONAL DESCRIPTION (continued)
Word 1 Bit Assignments
Bit Function
D0 Word select = 1
D1 Blank-time LSB
D2 Blank-time MSB
D3 Off-time LSB
D4 Off-time bit 1
D5 Off-time bit 2
D6 Off-time bit 3
D7 Off-time MSB
D8 Fast-decay time LSB
D9 Fast-decay time bit 1
D10 Fast-decay time bit 2
D11 Fast-decay time MSB
D12 C0 oscillator control
D13 C1 oscillator control
D14 SR control bit 1
D15 SR control bit 2
D16 Reserved for testing
D17 Reserved for testing
D18 Idle mode
D1 – D2 Blank Time. These two bits set the blank time for
the current-sense comparator. When a source driver turns on, a
current spike occurs due to the reverse-recovery currents of the
clamp diodes and/or switching transients related to distributed
capacitance in the load. To prevent this current spike from
erroneously resetting the source-enable latch, the sense com-
parator is blanked. The blank timer runs after the off-time
counter to provide the programmable blanking function. The
blank timer is reset when PHASE is changed.
D2 D1 Time
0 0 4/fOSC
0 1 6/fOSC
1 0 8/fOSC
1 1 12/fOSC
D3 – D7 Fixed Off Time. These five bits set the fixed off-
time for the internal PWM control circuitry. Fixed off-time is
defined by:
toff = [(1 + N) x 8/fOSC] - 1/fOSC
where N = 0.31
For example, with a master oscillator frequency of 4 MHz, the
fast-decay time will be adjustable from 1.75 µs to 63.75 µs in
increments of 2 µs.
D8 – D11 Fast Decay Time. These four bits set the fast-
decay portion of fixed off-time for the internal PWM control
circuitry. The fast-decay portion is defined by:
tfd = [(1 + N) x 8/fOSC] - 1/fOSC
where N = 0.15
For example, with an oscillator frequency of 4 MHz, the fast-
decay time will be adjustable from 1.75 µs to 31.75 µs in
increments of 2 µs. For tfd > toff , the device will effectively
operate in fast-decay mode.
D12 – D13 Oscillator Control. A 4 MHz internal oscillator
is used for the timing functions and charge-pump clock. If
more precise control is required, an external oscillator can be
input to the OSC terminal. To accommodate a wider range of
system clocks, an internal divider is provided to generate the
desired MO frequency according to the following table:
D13 D12
00
01
10
11
OSC
4 MHz internal clock
External clock
External clock/2
External clock/4
D14 – D15 Synchronous Rectification.
D15 D14
00
01
10
11
Synchronous Rectifier
Active
Disabled
Passive
Low side only
The different modes of operation are in the synchronous
rectification section of the functional description.
D16, D17. These bits are reserved for testing and should be
programmed to zero during normal operation.
D18 Idle Mode. The device can be placed in a low power
idlemode by writing a 0to D18. The outputs will be
disabled, the charge pump will be turned off, and the device
will draw a lower load supply currrent. The undervoltage
monitor circuit will remain active. D18 should be programmed
high for 1 ms before attempting to enable any output driver.
continued next page ...
115 Northeast Cutoff, Box 15036
6 Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









3973 pdf, datenblatt
3973
DUAL DMOS FULL-BRIDGE
MICROSTEPPING PWM MOTOR DRIVER
MOTOR DRIVERS
Function
Output Ratings*
Part Number
INTEGRATED CIRCUITS FOR BRUSHLESS DC MOTORS
3-Phase Power MOSFET Controller
— 28 V
3933
3-Phase Power MOSFET Controller
— 50 V
3932
3-Phase Power MOSFET Controller
— 50 V
7600
2-Phase Hall-Effect Sensor/Driver
400 mA
26 V
3626
Bidirectional 3-Phase Back-EMF Controller/Driver
±600 mA
14 V
8906
2-Phase Hall-Effect Sensor/Driver
900 mA
14 V
3625
3-Phase Back-EMF Controller/Driver
±900 mA
14 V
8902–A
3-Phase Controller/Drivers
±2.0 A
45 V
2936 & 2936-120
INTEGRATED BRIDGE DRIVERS FOR DC AND BIPOLAR STEPPER MOTORS
Dual Full Bridge with Protection & Diagnostics
±500 mA
30 V
3976
PWM Current-Controlled Dual Full Bridge
±650 mA
30 V
3966
PWM Current-Controlled Dual Full Bridge
±650 mA
30 V
3968
PWM Current-Controlled Dual Full Bridge
±750 mA
45 V
2916
PWM Current-Controlled Dual Full Bridge
±750 mA
45 V
2919
PWM Current-Controlled Dual Full Bridge
±750 mA
45 V
6219
PWM Current-Controlled Dual Full Bridge
±800 mA
33 V
3964
PWM Current-Controlled Dual DMOS Full Bridge
±1.0 A
35 V
3973
PWM Current-Controlled Full Bridge
±1.3 A
50 V
3953
PWM Current-Controlled Dual Full Bridge
±1.5 A
45 V
2917
PWM Current-Controlled Microstepping Full Bridge
±1.5 A
50 V
3955
PWM Current-Controlled Microstepping Full Bridge
±1.5 A
50 V
3957
PWM Current-Controlled Dual DMOS Full Bridge
±1.5 A
50 V
3972
Dual Full-Bridge Driver
±2.0 A
50 V
2998
PWM Current-Controlled Full Bridge
±2.0 A
50 V
3952
DMOS Full Bridge PWM Driver
±2.0 A
50 V
3958
Dual DMOS Full Bridge
±2.5 A
50 V
3971
UNIPOLAR STEPPER MOTOR & OTHER DRIVERS
Voice-Coil Motor Driver
±500 mA
6V
8932–A
Voice-Coil Motor Driver
±800 mA
16 V
8958
Unipolar Stepper-Motor Quad Drivers
1 A 46 V
7024 & 7029
Unipolar Microstepper-Motor Quad Driver
1.2 A
46 V
7042
Unipolar Stepper-Motor Translator/Driver
1.25 A
50 V
5804
Unipolar Stepper-Motor Quad Driver
1.8 A
50 V
2540
Unipolar Stepper-Motor Quad Driver
1.8 A
50 V
2544
Unipolar Stepper-Motor Quad Driver
3 A 46 V
7026
Unipolar Microstepper-Motor Quad Driver
3 A 46 V
7044
* Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits
or over-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output.
Complete part number includes additional characters to indicate operating temperature range and package style.
Also, see 3175, 3177, 3235, and 3275 Hall-effect sensors for use with brushless dc motors.
115 Northeast Cutoff, Box 15036
12 Worcester, Massachusetts 01615-0036 (508) 853-5000

12 Page





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