2919_06 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – DUAL FULL-BRIDGE PWM MOTOR DRIVER

2919
DUAL FULL-BRIDGE
MOTOR DRIVER
2919
A2919SB
OUT _1A 1
OUT _2A 2
E₂ 3
2
S E NS E ₂ 4
OUT _2B
5
GR OUND 6
GR OUND 7
I ₀₂
8
I ₁₂
99
P HAS E ₂ 10 θ₂
V _{R E F 2} 11
R C ₂ 12
V_BB
24 ^LOAD
S UP P LY
23 E 1
1
22 S E NS E ₁
21 OUT _1B
20 I ₀₁
19 G R OUND
18 G R OUND
17 I₁₁
θ₁ 16 P HAS E ₁
15 V _{R E F 1}
14
V _{C C} 13
RC ₁
L O G IC
S UP P LY
Dwg. P P -005
ABSOLUTE MAXIMUM RATINGS
at T_J ≤ 150°C
Motor Supply Voltage, V_BB ................... 45 V
Output Current, I_OUT
(Peak, t_w ≤ 20 µs) ........................ ±1.0 A
(Continuous) .......................... ±750 mA
Logic Supply Voltage, V_CC .................. 7.0 V
Logic Input Voltage Range,
V_IN ......................... -0.3 V to V_CC+0.3 V
Output Emitter Voltage, V_E .................. 1.5 V
Package Power Dissipation,
P_D ....................................... See Graph
Operating Temperature Range,
T_A ................................. -20°C to +85°C
Storage Temperature Range,
T_S ............................... -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 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.
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.
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