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3961 PDF даташит

Спецификация 3961 изготовлена ​​​​«Allegro MicroSystems» и имеет функцию, называемую «DUAL FULL-BRIDGE PWM MOTOR DRIVER».

Детали детали

Номер произв 3961
Описание DUAL FULL-BRIDGE PWM MOTOR DRIVER
Производители Allegro MicroSystems
логотип Allegro MicroSystems логотип 

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3961 Даташит, Описание, Даташиты
3961
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
3961
DUAL FULL-BRIDGE PWM MOTOR DRIVER
Designed for pulse-width modulated (PWM) current control of
bipolar stepper motors, the A3961S— is capable of continuous output
OUT1B 1
24 OUT2B
currents to ±800 mA and operating voltages to 45 V. Internal fixed
E1 2
SENSE1 3
OUT1A 4
TVBB1 5
GROUND 6
CGROUND 7
UVREFOUT 8
D YVREFIN 9
LRC1 10
PHASE1 11
O NENABLE1 12
23 E 2
22 SENSE 2
21 OUT2A
20 V BB2
19 GROUND
18 GROUND
17 I FULL/PD
16 V CC
15 RC2
14 PHASE 2
13 ENABLE2
PR ONote the A3961SB (DIP) and the A3961SLB
(SOIC) are electrically identical and share a
Ecommon terminal number assignment.
D CABSOLUTE MAXIMUM RATINGS
E NLoad Supply Voltage, VBB . . . . . . . . . . 45 V
U EOutput Current, IOUT . . . . . . . . . . ±800 mA*
Logic Supply Voltage, VCC . . . . . . . . . 7.0 V
IN RLogic Input Voltage Range,
VIN . . . . . . . . . . . -0.3 V to VCC + 0.3 V
T ESense Voltage, VSENSE . . . . . . . . . . . . 1.0 V
N FReference Output Current,
IREF OUT . . . . . . . . . . . . . . . . . . . 1.0 mA
O EPackage Power Dissipation,
C RPD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . -20˚C to +85˚C
IS RJunction Temperature, TJ . . . . . . . +150˚C†
Storage Temperature Range,
D FOTS . . . . . . . . . . . . . . . . -55˚C to +150˚C
off-time PWM current-control circuitry can be used to regulate the
maximum load current to a desired value. An internal precision voltage
reference is provided to improve motor peak current control accuracy.
The peak load current limit is set by the user’s selection of an external
resistor divider and current-sensing resistors.
The fixed off-time pulse duration is set by user-selected external
RC timing networks. 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 transi-
tions. This eliminates the need for two external RC filter networks on
the current-sensing comparator inputs.
For each bridge the PHASE input controls load current polarity by
selecting the appropriate source and sink driver pair. For each bridge
the ENABLE input, when held high, disables the output drivers. Special
power-up sequencing is not required. Internal circuit protection includes
thermal shutdown with hysteresis, transient-suppression diodes, and
crossover-current protection.
The A3961S— is supplied in a choice of two power packages:
24-pin dual-in-line plastic package with copper heat-sink tabs and
24-lead plastic SOIC with copper heat-sink tabs. In both packages the
power tab is at ground potential and needs no electrical isolation.
FEATURES
s ±800 mA Continuous Output Current Rating
s 45 V Output Voltage Rating
s Internal PWM Current Control, Saturated Sink Drivers
s Internally Generated Precision 2.5 V Reference
s Internal Transient-Suppression Diodes
s Internal Thermal-Shutdown Circuitry
s Crossover-Current Protection, UVLO Protection
* 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 tempera-
ture of 150˚C.
Always order by complete part number:
† Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.
PART NUMBER
A3961SB
A3961SLB
PACKAGE
24-Pin DIP
24-Lead SOIC
RθJA
40°C/W
55°C/W
RθJT
6°C/W
6°C/W









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3961 Даташит, Описание, Даташиты
3961
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
5
RθJT = 6.0°C/W
4
3
SUFFIX 'B', R θJA = 40°C/W
2
1
SUFFIX 'LB', R θJA = 55°C/W
TRUTH TABLE
ENABLE
H
PHASE
X
LH
LL
X = Irrelevant
OUTA
Off
H
L
0
25 50 75 100 125 150
TEMPERATURE IN °C
Dwg. GP-049A
FUNCTIONAL BLOCK DIAGRAM AND TYPICAL
BIPOLAR STEPPER MOTOR APPLICATION
MOTOR SUPPLY 1
LOGIC SUPPLY
MOTOR SUPPLY 2
CBB
Ccc
V BB1
V cc
GND
V BB2
C BB2
OUTB
Off
L
H
OUT 1A
OUT 1B
OUT2A
OUT 2B
ENABLE 1
PHASE 1
RC1
CONTROL LOGIC
AND LEVEL SHIFT
BLANKING
TIME AND
SOURCE
DRIVER T OFF
CONTROL
+
_
UVLO
AND
TSD
VOLTAGE
REFERENCE
CONTROL LOGIC
AND LEVEL SHIFT
BLANKING
+ TIME AND
SOURCE
_
DRIVER T OFF
CONTROL
ENABLE 2
PHASE 2
RC 2
SENSE 1
E1 IFULL/PD REFOUT
REFIN E 2
SENSE 2
RT1 CT1
E 2 RS1
R1
R2 RS2
CT2
RT2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright ©1995, 1996, Allegro MicroSystems, Inc.









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3961 Даташит, Описание, Даташиты
3961
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 45 V, VCC = 4.75 V to 5.25 V, VSENSE = 0
V, 30 k& 1000 pF RC to Ground (unless noted otherwise)
Characteristic
Symbol Test Conditions
Min.
Limits
Typ. Max.
Units
Output Drivers
Load Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Clamp Diode Forward Voltage
(Sink or Source)
Motor Supply Current
(No Load)
VBB
ICEX
VCE(SAT)
VF
IBB(ON)
IBB(OFF)
Operating, IOUT = ±800 mA, L = 3 mH
VOUT = VBB
VOUT = 0 V
Source Driver, IOUT = -500 mA
Source Driver, IOUT = -750 mA
Source Driver, IOUT = -800 mA
Sink Driver, IOUT = +500 mA
Sink Driver, IOUT = +750 mA
Sink Driver, IOUT = +800 mA
IF = 500 mA
IF = 750 mA
IF = 800 mA
VENABLE = 0.8 V
VENABLE = 2.4 V
5.0 — 45
— <1.0 50
<-1.0
-50
— 1.0 1.2
— 1.1 1.3
— — 1.4
— 0.3 0.6
— 0.5 0.9
— — 1.0
— 1.1 1.4
— 1.3 1.6
— — 1.7
— 5.0 7.0
— 5.0 7.0
V
µA
µA
V
V
V
V
V
V
V
V
V
mA
mA
Control Logic
Logic Supply Voltage Range
Logic Input Voltage
Logic Input Current
Reference Output Voltage
VCC
VIN(1)
VIN(0)
IIN(1)
IIN(0)
VREF OUT
Operating
VIN = 2.4 V
VIN = 0.8 V
VCC = 5.0 V, IREF OUT = 90 to 900 µA:
IFULL/PD = LOW
IFULL/PD = HIGH
4.75 — 5.25
2.4 —
— — 0.8
— <1.0 20
— <-2.0 -200
V
V
V
µA
µA
2.45 2.50 2.55
1.49 1.67 1.84
V
V
Continued next page…










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