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Allegro MicroSystems - DUAL FULL-BRIDGE PWM MOTOR DRIVER

Numéro de référence 2919
Description DUAL FULL-BRIDGE PWM MOTOR DRIVER
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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2919 fiche technique
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

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