Allegro A2919SLB Dual full-bridge pwm motor driver Datasheet

2919
Data Sheet
29319.21
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
A2919SB
OUT 1A
1
OUT 2A
2
E2
3
VBB
1
2
24
LOAD
SUPPLY
23
E1
22
SENSE 1
21
OUT 1B
OUT 2B
5
20
I 01
GROUND
6
19
GROUND
GROUND
7
18
GROUND
I 02
8
17
I 11
I
99
16
PHASE 1
15
V REF 1
14
RC 1
13
LOGIC
SUPPLY
12
PHASE 2
10
V REF 2
11
RC 2
12
θ2
PWM 1
4
PWM 2
SENSE 2
θ1
V CC
Dwg. PP-005
ABSOLUTE MAXIMUM RATINGS
at TJ ≤ 150°C
Motor Supply Voltage, VBB ................... 45 V
Output Current, IOUT
(Peak, tw ≤ 20 µs) ........................ ±1.0 A
(Continuous) .......................... ±750 mA
Logic Supply Voltage, VCC ................... 7.0 V
Logic Input Voltage Range,
VIN ............................... -0.3 V to +7.0 V
Output Emitter Voltage, VE .................. 1.5 V
Package Power Dissipation,
PD ....................................... See Graph
Operating Temperature Range,
TA ................................. -20°C to +85°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 peak
current rating or a junction temperature of +150°C.
The A2919SB and A2919SLB motor drivers are designed to drive
both windings of a bipolar stepper motor or bidirectionally control two
dc motors. Both bridges are capable of sustaining 45 V and include
internal pulse-width modulation (PWM) control of the output current to
750 mA. The outputs have been optimized for a low output-saturation
voltage drop (less than 1.8 V total source plus sink at 500 mA).
For PWM current control, the maximum output current is determined by the user’s selection of a reference voltage and sensing
resistor. Two logic-level inputs select output current limits of 0%, 41%,
67%, or 100% of the maximum level. A PHASE input to each bridge
determines load current direction.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent cross-over currents when switching current direction. Special
power-up sequencing is not required. Thermal protection circuitry
disables the outputs if the chip temperature exceeds safe operating
limits.
The A2919SB is supplied in a 24-pin dual in-line plastic batwing
package with a copper lead-frame and heat sinkable tabs for improved
power dissipation capabilities. The A2919SLB is supplied in a 24-lead
surface-mountable SOIC. Their batwing construction provides for
maximum package power dissipation in the smallest possible construction. The A2919SB/SLB are available for operation from -40°C to
+85°C. To order, change the suffix from 'S–' to 'E–'. These devices
are also available on special order for operation to +125°C. For
applications not requiring quarter-step operation, but desire lower
detent or running current, the similar UDN2916B/EB/LB may be preferred.
FEATURES
■
■
■
■
■
■
■
750 mA Continuous Output Current
45 V Output Sustaining Voltage
Internal Clamp Diodes
Internal PWM Current Control
Low Output Saturation Voltage
Internal Thermal Shutdown Circuitry
Half- or Quarter-Step Operation of Bipolar Stepper Motors
Always order by complete part number:
Part Number
Package
RθJA
A2919SB
24-Pin DIP
40°C/W
A2919SLB
24-Lead SOIC
55°C/W
RθJT
6.0°C/W
6.0°C/W
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
02
1
I 12
2
PHASE 2
3
PWM 2
I
θ2
24
LOAD SUPPLY
23
OUT 2B
22
SENSE 2
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
A2919SLB
2
4
21
E2
RC 2
5
20
OUT 2A
GROUND
6
19
GROUND
GROUND
7
18
GROUND
LOGIC SUPPLY
8
17
OUT 1A
RC 1
99
16
E1
15
SENSE 1
14
OUT 1B
13
I 01
VBB
V REF 2
V CC
1
10
PHASE 1
11
I 11
12
θ1
RθJT = 6.0°C/W
4
3
SUFFIX 'B', R θJA = 40°C/W
2
1
SUFFIX 'LB', R θJA = 55°C/W
0
50
25
75
100
TEMPERATURE IN °C
125
150
Dwg. GP-049A
PWM 1
V REF 1
5
TRUTH TABLE
PHASE
OUTA
OUTB
H
L
H
L
L
H
Dwg. PP-047
PWM CURRENT-CONTROL CIRCUITRY
V
'B' PACKAGE,
CHANNEL 1
PIN NUMBERS
SHOWN.
BB
24
OUT B
1
21
OUT A
V REF 15
23 E
60 kΩ
÷10
SENSE –
22
120 kΩ
RC
42 kΩ
I 0 20
I 1 17
ONE
SHOT
+
RS
SOURCE
DISABLE
14 RC
CC
RT
CT
Dwg. EP-007-3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
W
Copyright © 1994 Allegro MicroSystems, Inc.
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ ≤ 150°C, VBB = 45 V, VCC = 4.75 V to 5.25 V,
VREF = 5.0 V (unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Output Drivers (OUTA or OUT B)
Motor Supply Range
VBB
Operating
10
—
45
V
Output Leakage Current
ICEX
VOUT = V BB
—
< 1.0
50
µA
VOUT = 0
—
<-1.0
-50
µA
Output Sustaining Voltage
VCE(sus)
IOUT = ±750 mA, L = 3.0 mH
45 + VF
—
—
V
Output Saturation Voltage
VCE(SAT)
Sink Driver, IOUT = +500 mA
—
0.4
0.6
V
Sink Driver, IOUT = +750 mA
—
1.0
1.2
V
Source Driver, IOUT = -500 mA
—
1.0
1.2
V
Source Driver, IOUT = -750 mA
—
1.3
1.5
V
Clamp Diode Leakage Current
IR
VR = 45 V
—
< 1.0
50
µA
Clamp Diode Forward Voltage
VF
IF = 750 mA
—
1.6
2.0
V
IBB(ON)
Both Bridges ON, No Load
—
20
25
mA
IBB(OFF)
Both Bridges OFF
—
5.0
10
mA
VIN(1)
All inputs
2.4
—
—
V
VIN(0)
All inputs
—
—
0.8
V
IIN(1)
VIN = 2.4 V
—
<1.0
20
µA
VIN = 0.8 V
—
- 3.0
-200
µA
1.0
—
7.5
V
I0 = I1 = 0.8 V, VREF = 1.0 V to 7.5 V
9.5
10
10.5
—
I0 = 2.4 V, I1 = 0.8 V,
13.5
15
16.5
—
20.7
24.4
28.0
—
—
170
—
°C
Driver Supply Current
Control Logic
Input Voltage
Input Current
Reference Voltage Range
Current Limit Threshold
(at trip point)
VREF
VREF / VSENSE
VREF = 1.5 V to 7.5 V
I0 = 0.8 V, I1 = 2.4 V,
VREF = 1.5 V to 7.5 V
Thermal Shutdown Temperature
Total Logic Supply Current
Total Reference Current
TJ
ICC(ON)
I0 = I1 = 0.8 V, No Load
—
40
50
mA
ICC(OFF)
I0 = I1 = 2.4 V, No Load
—
10
12
mA
140
185
250
µA
IREF1 + IREF2
VREF1 = VREF2 = 7.5 V, I0 = I1 = 2.4 V
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
APPLICATIONS INFORMATION
PWM CURRENT CONTROL
The A2919SB/SLB dual bridges are
designed to drive both windings of a bipolar
stepper motor. Output current is sensed and
controlled independently in each bridge by
an external sense resistor (RS), internal
comparator, and monostable multivibrator.
When the bridge is turned ON, current
increases in the motor winding and flows
through the external sense resistor until the
sense voltage (VS) reaches the level set at
the comparator’s input:
PWM OUTPUT CURRENT WAVE FORM
V PHASE
+
I
OUT
0
–
ITRIP = VREF/10 RS
The comparator then triggers the
monostable, which turns OFF the source
driver of the bridge. The actual load current
peak will be slightly higher than the trip point
(especially for low-inductance loads) because of the internal logic and switching
delays. This delay (td) is typically 2 µs. After
turn-off, the motor current decays, circulating
through the ground-clamp diode and sink
transistor. The source driver’s OFF time
(and therefore the magnitude of the current
decrease) is determined by the monostable’s
external RC timing components, where
toff = R TCT within the range of 20 kΩ to
100 kΩ and 100 pF to 1000 pF.
I TRIP
td
t off
Dwg. WM-003-1A
LOAD CURRENT PATHS
V
BB
When the source driver is re-enabled,
the winding current (the sense voltage) is
again allowed to rise to the comparator’s
threshold. This cycle repeats itself, maintaining the average motor winding current at the
desired level.
Loads with high distributed capacitances
may cause current spikes capable of tripping
the comparator, resulting in erroneous
current control. An external RCCC time delay
should be used to delay the action of the
comparator. Depending on load type, many
applications will not require these external
components (SENSE connected to E).
RS
BRIDGE ON
SOURCE OFF
ALL OFF
Dwg. EP-006-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT
GENERAL
Two logic level inputs (l0 and I1) allow digital selection
of the motor winding current at 100%, 67%, 41%, or 0% of
the maximum level per the table. The 0% output current
condition turns OFF all drivers in the bridge and can be
used as an OUTPUT ENABLE function.
The PHASE input to each bridge determines the
direction motor winding current flows. An internally
generated deadtime (approximately 2 µs) prevents crossover currents that can occur when switching the PHASE
input.
CURRENT-CONTROL TRUTH TABLE
All four drivers in the bridge output can be turned OFF
between steps (l0 = l1 ≥ 2.4 V) resulting in a fast current
decay through the internal output clamp and flyback
diodes. The fast current decay is desirable in half-step and
high-speed applications. The PHASE, l0, and I1 inputs
float high.
l0
I1
Output Current
L
L
VREF/10 RS = 100% ITRIP
H
L
V REF/15 RS = 67% ITRIP
L
H
VREF/24.4 RS = 41% ITRIP
H
H
0
These logic level inputs greatly enhance the implementation of µP-controlled drive formats.
During half-step operations, l0 and l1 allow the µP to
control the motor at a constant torque between all positions in an eight-step sequence. This is accomplished by
digitally selecting 100% drive current when only one phase
is ON and 67% drive current when two phases are ON.
Logic highs on both l0 and l1 turn OFF all drivers to allow
rapid current decay.
During quarter-step operation, I0 and I1 allow the µP to
control the motor position in a sixteen-step sequence.
This is accomplished by digitally selecting drive current as
shown in the table (for one quadrant of operation). Logic
highs on both I0 and I1 turn OFF all drivers to allow rapid
current decay.
The logic control inputs can also be used to select a
reduced current level (and reduced power dissipation) for
‘hold’ conditions and/or increased current (and available
torque) for start-up conditions.
QUARTER-STEPPING CURRENT CONTROL
Phase 1
Current Level
Phase 2
Current Level
100%
0%
100%
41%
67%
67%
41%
100%
0%
100%
Varying the reference voltage (VREF) provides continuous control of the peak load current for micro-stepping
applications.
Thermal protection circuitry turns OFF all drivers when
the junction temperature reaches +170°C. It is only
intended to protect the device from failures due to excessive junction temperature and should not imply that output
short circuits are permitted. The output drivers are reenabled when the junction temperature cools to +145°C.
The A2919SB/SLB output drivers are optimized for
low output saturation voltages—less than 1.8 V total
(source plus sink) at 500 mA. Under normal operating
conditions, when combined with the excellent thermal
properties of the batwing package design, this allows
continuous operation of both bridges simultaneously at
500 mA.
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
TYPICAL APPLICATION
STEPPER
MOTOR
V
BB
VBB
1
24
+
RS
23
2
RS
RC
1
22
3
RC
21
5
20
6
19
7
18
8
17
C
FROM
µP
10
VREF
FROM
µP
θ 1 16
15
V
REF
14
11
12
RT
θ2
PWM 2
99
PWM 1
C
CC
2
4
V CC
13
+5 V
CT
RT
CT
Dwg. EP-008B
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
A2919SB
Dimensions in Inches
(controlling dimensions)
24
0.014
0.008
13
NOTE 1
0.430
MAX
0.280
0.240
0.300
BSC
1
0.070
0.045
6
7
0.100
1.280
1.230
12
BSC
0.005
MIN
0.210
MAX
0.150
0.115
0.015
MIN
0.022
0.014
Dwg. MA-001-25A in
Dimensions in Millimeters
(for reference only)
24
0.355
0.204
13
NOTE 1
10.92
MAX
7.11
6.10
7.62
BSC
1
1.77
1.15
6
7
2.54
32.51
31.24
BSC
12
0.13
MIN
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Lead thickness is measured at seating plane or below.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendor’s option within limits shown.
Dwg. MA-001-25A mm
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
A2919SLB
Dimensions in Inches
(for reference only)
24
13
0.0125
0.0091
0.491
0.394
0.2992
0.2914
0.050
0.016
0.020
0.013
1
2
3
0.050
0.6141
0.5985
0° TO 8°
BSC
NOTE 1
NOTE 3
0.0926
0.1043
0.0040 MIN.
Dwg. MA-008-25 in
Dimensions in Millimeters
(controlling dimensions)
24
13
0.32
0.23
10.65
10.00
7.60
7.40
1.27
0.40
0.51
0.33
1
2
3
15.60
15.20
1.27
BSC
0° TO 8°
NOTE 1
NOTE 3
2.65
2.35
0.10 MIN.
Dwg. MA-008-25A mm
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such
departures from the detail specifications as may be required to permit improvements
in the design of its products.
The information included herein is believed to be accurate and reliable.
However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for
any infringements of patents or other rights of third parties which may result from its
use.
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally
one piece.
2. Lead spacing tolerance is non-cumulative.
3. Exact body and lead configuration at vendor’s option
within limits shown.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Similar pages