2927 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – DUAL FULL-BRIDGE PWM MOTOR DRIVER

2927
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
2927
PRELIMINARY INFORMATION
(Subject to change without notice)
September 16, 1997
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The A2927SEB motor driver is designed to drive both windings of a
bipolar stepper motor or bidirectionally control two dc motors. Both
bridges are capable of sustaining 50 V and include internal pulse-width
modulation (PWM) control of the output current to 1.5 A.
GND 7
39 GND
For PWM current control, the maximum output current is determined
8
9
10
1
T ₁₁
12
C ₁₃
U 14
2
15
D ^Y ₁₆
PRO_E ^{ONL GND 17}
PWM 1
PWM 2
38
37
36
35
34
33
32
31
30
29 GND
Dwg. PP-021
by the user’s selection of a reference voltage and sensing resistor. Two
logic-level inputs select output current limits of 0, 33%, 67%, or 100%
of the maximum level. A PHASE input to each bridge determines load
current direction. Active-low ENABLE inputs control the four drivers in
each bridge.
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 A2927SEB is supplied in a 44-lead power PLCC for surface-
mount applications. Its batwing construction provides for maximum
package power dissipation in the smallest possible construction.
UED _{ENC ABSOLUTE MAXIMUM RATINGS}
N ^{at TJ ≤ +150°C}
I ^R _{Motor Supply Voltage, VBB ................... 50 V}
T ^{E Output Current, IOUT ......................... ±1.5 A}
F Logic Supply Voltage, V_CC ................... 7.0 V
N _{Logic Input Voltage Range,}
E _{VIN ............................... -0.3 V to +7.0 V}
O _{R Output Emitter Voltage, VE .................. 1.0 V}
C ^{Package Power Dissipation,}
S ^{R PD ........................................ See Graph}
Operating Temperature Range,
I _{O TA ................................. -20°C to +85°C}
D _{F Storage Temperature Range,}
FEATURES
s 1.5 A Output Current
s 50 V Output Sustaining Voltage
s Internal Flyback Diodes
s Digital Control of Output Current
s Undervoltage Lockout
s Internal Thermal Shutdown Circuitry
— ^{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.
Always order by complete part number: A2927SEB .