3966
DUAL FULL-BRIDGE PWM
MOTOR DRIVER
The A3966SA and A3966SLB are designed to drive both windings of a
two-phase bipolar stepper motor. Each device includes two H-bridges
capable of continuous output currents of 650 mA and operating voltages to
30 V. Motor winding current can be controlled by the internal fixed-fre-
quency, pulse-width modulated (PWM), current-control circuitry. The peak
load current limit is set by the user’s selection of a reference voltage and
current-sensing resistors. Except for package style and pinout, the two
devices are identical.
A3966SLB
OUT
16
15
14
1
2
OUT
2A
1A
V
BB
PHASE
PHASE
2
1
1
ENABLE
ENABLE
2
3
4
The fixed-frequency pulse duration is set by a user-selected external
RC timing network. The capacitor in the RC timing network also determines
a user-selectable blanking window that prevents false triggering of the PWM
current-control circuitry during switching transitions.
LOGIC
LOGIC
GROUND
SENSE
13 GROUND
5
6
12 SENSE
2
1
OUT
11 OUT
1B
2B
V
To reduce on-chip power dissipation, the H-bridge power outputs have
been optimized for low saturation voltages. The sink drivers feature Allegro’s
patented Satlington™ output structure. The Satlington outputs combine the
low voltage drop of a saturated transistor and the high peak current capability
of a Darlington.
BB
LOAD
SUPPLY
LOGIC
10
7
8
V
CC
SUPPLY
REFERENCE
V
RC
RC
9
REF
Dwg. PP-066-1
For each bridge, a PHASE input controls load-current polarity by
selecting the appropriate source and sink driver pair. For each bridge, an
ENABLE input, when held high, disables the output drivers. Special power-
up sequencing is not required. Internal circuit protection includes thermal
shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-
current protection.
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, VBB ...................... 30 V
Output Current, IOUT (peak) ........... 750 mA
(continuous) .............................. 650 mA
Logic Supply Voltage, VCC .................... 7.0 V
Input Voltage, Vin ........ -0.3 V to VCC + 0.3 V
Sense Voltage, VS ................................ 1.0 V
Package Power Dissipation (TA = 25°C), PD
A3966SA ..................................... 2.08 W*
A3966SLB ................................... 1.87 W*
Operating Temperature Range,
The A3966SA is supplied in a 16-pin dual in-line plastic package. The
A3966SLB is supplied in a 16-lead plastic SOIC with copper heat sink tabs.
The power tab is at ground potential and needs no electrical isolation.
FEATURES
I
650 mA Continuous Output Current
I 30 V Output Voltage Rating
I Internal Fixed-Frequency PWM Current Control
I Satlington™ Sink Drivers
I User-Selectable Blanking Window
I Internal Ground-Clamp & Flyback Diodes
I Internal Thermal-Shutdown Circuitry
I Crossover-Current Protection and UVLO Protection
TA ..................................... -20°C to +85°C
Junction Temperature,
TJ .................................................. +150°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 current rating
or a junction temperature of 150°C.
Always order by complete part number:
Part Number
A3966SA
Package
RθJA
RθJC
38°C/W
—
RθJT
—
* Per SEMI G42-88 Specification, Thermal Test Board
Standardization for Measuring Junction-to-Ambient
Thermal Resistance of Semiconductor Packages.
16-pin DIP
60°C/W
67°C/W
A3966SLB
16-lead batwing SOIC
6°C/W
5秒后页面跳转
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