2919
DUAL FULL-BRIDGE
MOTOR DRIVER
2919
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).
A2919SB
V
BB
LOAD
S UP P LY
1
2
3
24
23
22
21
OUT
OUT
1A
2A
E
1
1
S E NS E
E
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.
1
2
2
2
S E NS E
OUT
4
5
6
OUT
1B
20
I
01
2B
G R OUND
G R OUND
19
18
G R OUND
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent crossover 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.
7
8
G R OUND
I
17
16
15
14
13
I
11
02
9
9
θ
P HAS E
1
I
1
12
V
10
P HAS E
2
θ
R E F
1
2
R C
11
12
V
1
R E F
R C
2
2
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 applica-
tions not requiring quarter-step operation, but desire lower detent or
running current, the similar UDN2916B/EB/LB may be preferred.
LOG IC
S UP P LY
V
C C
Dwg. P P -005
ABSOLUTE MAXIMUM RATINGS
at TJ ≤ 150°C
Motor Supply Voltage, V ................... 45 V
BB
Output Current, I
OUT
(Peak, tw ≤ 20 µs) ........................ ±1.0 A
(Continuous) .......................... ±750 mA
FEATURES
■
750 mA Continuous Output Current
Logic Supply Voltage, V
.................. 7.0 V
CC
Logic Input Voltage Range,
■ 45 V Output Sustaining Voltage
V
......................... -0.3 V to V +0.3 V
■
■
Internal Clamp Diodes
IN
CC
Output Emitter Voltage, V .................. 1.5 V
E
Internal PWM Current Control
Package Power Dissipation,
■ Low Output Saturation Voltage
P
....................................... See Graph
D
■ Internal Thermal Shutdown Circuitry
Operating Temperature Range,
■ Half- or Quarter-Step Operation of Bipolar Stepper Motors
T ................................. -20°C to +85°C
A
Storage Temperature Range,
T ............................... -55°C to +150°C
S
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.