A3957SLB Allegro, A3957SLB Datasheet

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A3957SLB

Manufacturer Part Number
A3957SLB
Description
Full Bridge PWM Motor Driver 5V 24-Pin SOIC W
Manufacturer
Allegro
Type
Full Bridge PWM Motor Driverr
Datasheet

Specifications of A3957SLB

Package
24SOIC W
Operating Supply Voltage
5 V
Maximum Operating Current
4 mA
Operating Temperature
-20 to 85 °C

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A3957SLB
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Load Supply Voltage, V
Output Current, I
Logic Supply Voltage, V
Logic/Reference Input Voltage Range,
Sense Voltage, V
Package Power Dissipation (T
Operating Temperature Range,
Junction Temperature, T
Storage Temperature Range,
* 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 temperature
of 150 C.
† Per SEMI G42-88 Specification, Thermal Test
Board Standardization for Measuring Junction-
to-Ambient Thermal Resistance of Semiconductor
Packages..
ABSOLUTE MAXIMUM RATINGS
CONNECT
CONNECT
CONNECT
(Continuous) . . . . . . . . . . . . .
V
A3957SA . . . . . . . . . . . . . . . . 2.08 W†
A3957SLB . . . . . . . . . . . . . . . 2.23 W†
T
T
GROUND
GROUND
SUPPLY
A
S
IN
LOGIC
PHASE
. . . . . . . . . . . . . . . -55˚C to +150˚C
REF
PFD
NO
NO
RC
D 3
D 2
NO
. . . . . . . . . . -0.3 V to V
. . . . . . . . . . . . . . . -20˚C to +85˚C
10
11
12
3
8
9
1
2
4
5
6
7
V
NC
NC
NC
A3957SLB
CC
OUT
S
. . . . . . . . . . . . . . .
LOGIC
V
BB
BB
J
CC
. . . . . . . . +150˚C
. . . . . . . . . 50 V
NC
NC
NC
NC
. . . . . . .
A
20
17
16
15
14
13
24
22
21
19
18
23
= 25 C), P
Dwg. PP-056-4
CC
LOAD
SUPPLY
OUT B
D 0
D
NO
CONNECT
NO
CONNECT
GROUND
GROUND
SENSE
NO
CONNECT
OUT A
NO
CONNECT
1
+ 0.3 V
1.5 A*
7.0 V
1.0 V
D
MICROSTEPPING MOTOR DRIVER
3957
Always order by complete part number:
bipolar stepper motor in a microstepping mode. The outputs are rated for
continuous output currents to 1.5 A and operating voltages to 50 V. Internal
pulse-width modulated (PWM) current control combined with an internal
four-bit nonlinear digital-to-analog converter allows the motor current to be
controlled in full-, half-, quarter-, eighth-, or sixteenth-step (microstepping)
modes. Nonlinear increments minimize the number of control lines necessary
for microstepping. Microstepping provides for increased step resolution, and
reduces torque variations and resonance problems at low speed.
operates in a slow (recirculating) current-decay mode, fast (regenerative)
current-decay mode, or in a mixed current-decay mode in which the off time
is divided into a period of fast current decay with the remainder of the fixed
off time spent in slow current decay. The combination of user-selectable
current-sensing resistor and reference voltage, digitally selected output
current ratio; and slow, fast, or mixed current-decay modes provides users
with a broad, variable range of motor control.
transient-suppression diodes, and crossover current protection. Special
power-up sequencing is not required.
dual-in-line plastic package (suffix ‘A’), and a 24-lead plastic SOIC with
copper heat-sink tabs (suffix ‘LB’). The power tab is at ground potential and
needs no electrical isolation.
FEATURES
Part Number
50 V Output Voltage Rating
Internal PWM Current Control
4-Bit Non-Linear DAC for 16-Bit Microstepping
Satlington™ Sink Drivers
Fast, Mixed Fast/Slow, and Slow Current-Decay Modes
Internal Transient-Suppression Diodes
Internal Thermal-Shutdown Circuitry
Crossover-Current and UVLO Protection
A3957SLB
1.5 A Continuous Output Current
The A3957SA and A3957SLB are designed for driving one winding of a
Internal circuitry determines whether the PWM current-control circuitry
Internal circuit protection includes thermal shutdown with hysteresis,
The A3957S— is supplied in a choice of two power packages; a 16-pin
A3957SA
Package
16-pin DIP
24-lead batwing SOIC
FULL-BRIDGE PWM
60 C/W
56 C/W
R
JA
38 C/W
R
JC
6 C/W
R
JT

Related parts for A3957SLB

A3957SLB Summary of contents

Page 1

... Logic/Reference Input Voltage Range -0 0 Sense Voltage Package Power Dissipation ( C A3957SA . . . . . . . . . . . . . . . . 2.08 W† A3957SLB . . . . . . . . . . . . . . . 2.23 W† Operating Temperature Range -20˚C to +85˚C A Junction Temperature +150˚C J Storage Temperature Range -55˚C to +150˚ Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. ...

Page 2

... FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER FUNCTIONAL BLOCK DIAGRAM (A3957SLB shown) PHASE 10 GROUND 6 7 UVLO & TSD 18 19 MIXED-DECAY COMPARATOR PFD 2 + – BLANKING V CC A3957SA NO 16 GROUND 1 NC CONNECT 2 SENSE OUT OUT A LOGIC LOAD SUPPLY V BB PFD REF 11 PHASE 6 LOGIC SUPPLY ...

Page 3

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER 1 2 where V Table 1 — PHASE Truth Table PHASE OUT ...

Page 4

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER ELECTRICAL CHARACTERISTICS at T otherwise noted.) Characteristic Symbol Power Outputs Load Supply Voltage Range Output Leakage Current Output Saturation Voltage V (Forward or Reverse Mode) Sense Current Offset Clamp Diode Forward Volt. (Sink or ...

Page 5

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER ELECTRICAL CHARACTERISTICS at T otherwise noted.) Characteristic Control Circuitry (continued) Mixed-Decay Comparator Trip Points Mixed-Decay Comparator Input Offset Voltage Mixed-Decay Comparator Hysteresis Reference Input Current Reference Divider Ratio Digital-to-Analog Converter Accuracy* Current-Sense Comparator Input ...

Page 6

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER ELECTRICAL CHARACTERISTICS at T otherwise noted.) Characteristic Symbol AC Timing PWM RC Fixed Off-time t PWM Turn-Off Time t PWM(OFF) PWM Turn-On Time t PWM(ON) PWM Minimum On Time t Crossover Dead Time = ...

Page 7

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER Source Driver Saturation Voltage 1.5 1.25 1.0 0.75 0.5 0. 0.5 0.75 0.25 OUTPUT CURRENT IN AMPERES Clamp Diode Forward Voltage 1.5 1.25 1.0 0.75 0.5 0. 0.5 0.75 0.25 ...

Page 8

... FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER A3957SA A3957SLB Terminal Pin Lead Name – PFD 6 3 REF – 6-7 GROUND LOGIC SUPPLY 11 10 PHASE – – OUT – SENSE 16 – 18-19 GROUND – OUT 4 23 LOAD SUPPLY – For the ‘A’ package, pins 1 and 8 must be externally connected together. ...

Page 9

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER Functional Description Two A3957S— full-bridge PWM microstepping motor drivers are needed to drive the windings of a bipolar stepper motor. Internal pulse-width modulated (PWM) control circuitry regulates each motor winding’s current. The peak motor ...

Page 10

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER Under some circumstances slow-decay mode PWM can fail to maintain good current regulation: 1) The load current will fail to regulate in slow-decay mode due to a sufficiently negative back-EMF voltage in con- junction ...

Page 11

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER cost of decreased average current accuracy or increased driver and motor losses. Mixed Current-Decay Mode PFD 2.9 V, the device will mixed current-decay mode. Mixed-decay mode allows the user ...

Page 12

... The output transistors are re-enabled when the junction temperature cools to approximately +150 C. Stepper Motor Applications. The A3957SB or A3957SLB are used to optimize performance in microstepping/sinusoidal BRIDGE A 1 ...

Page 13

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER Full / / / / Step Step Step Step Step PHASE ...

Page 14

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER 16 0.280 0.240 1 0.070 0.045 0.210 MAX 0.015 MIN 0.022 0.014 16 7.11 6.10 1 1.77 1.15 5.33 MAX 0.39 MIN 0.558 0.356 NOTES:1. Exact body and lead configuration at vendor’s option within ...

Page 15

... NOTES:1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative 3. Webbed lead frame. Leads 4, 5, 12, and 13 are internally one piece. A3957SLB Dimensions in Inches (for reference only 0.050 0.6141 BSC ...

Page 16

... The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringe- ments of patents or other rights of third parties which may result from its use. 115 Northeast Cutoff, Box 15036 ...

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