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PDF A2919SB Data sheet ( Hoja de datos )
| Número de pieza | A2919SB | |
| Descripción | DUAL FULL-BRIDGE PWM MOTOR DRIVER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A2919SB (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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2919
DUAL FULL-BRIDGE
MOTOR DRIVER
2919
A2919SB
OUT 1A 1
OUT 2A 2
E2 3
SENSE 2 4
OUT 2B 5
GROUND 6
2
GROUND 7
I 02
I 12
PHASE 2
8
99
10 θ2
V REF 2 11
RC 2 12
VBB
24
LOAD
SUPPLY
23 E 1
1
22 SENSE 1
21 OUT 1B
20 I 01
19 GROUND
18 GROUND
17 I 11
θ1 16 PHASE 1
15 V REF 1
14
VCC 13
RC 1
LOGIC
SUPPLY
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.
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
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 deter-
mined 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 construc-
tion. 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 pre-
ferred.
FEATURES
s 750 mA Continuous Output Current
s 45 V Output Sustaining Voltage
s Internal Clamp Diodes
s Internal PWM Current Control
s Low Output Saturation Voltage
s Internal Thermal Shutdown Circuitry
s Half- or Quarter-Step Operation of Bipolar Stepper Motors
Always order by complete part number:
Part Number Package
A2919SB
24-Pin DIP
RθJA
40°C/W
A2919SLB
24-Lead SOIC 55°C/W
RθJT
6.0°C/W
6.0°C/W
1 page  
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT
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.
CURRENT-CONTROL TRUTH TABLE
l0 I1
Output Current
L L VREF/10 RS = 100% ITRIP
H L VREF/15 RS = 67% ITRIP
L H VREF/24.4 RS = 41% ITRIP
HH
0
These logic level inputs greatly enhance the implem-
entation 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 posi-
tions 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%
GENERAL
The PHASE input to each bridge determines the
direction motor winding current flows. An internally
generated deadtime (approximately 2 µs) prevents cross-
over currents that can occur when switching the PHASE
input.
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.
Varying the reference voltage (VREF) provides continu-
ous 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 exces-
sive junction temperature and should not imply that output
short circuits are permitted. The output drivers are re-
enabled 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.
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet A2919SB.PDF ] | |
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