A3958SLB [ALLEGRO]
DMOS FULL-BRIDGE PWM MOTOR DRIVER; DMOS全桥PWM电机驱动器
| 型号： | A3958SLB |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | DMOS FULL-BRIDGE PWM MOTOR DRIVER |
| 文件： | 总12页 (文件大小：177K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3958
DMOS FULL-BRIDGE PWM
MOTOR DRIVER
Designed for pulse-width modulated (PWM) current control of dc
motors, the A3958SB and A3958SLB are capable of continuous output
currents to 2 A and operating voltages to 50 V. Internal fixed off-
time PWM current-control timing circuitry can be programmed via a
serial interface to operate in slow, fast, and mixed current-decay
modes.
A3958SLB
CP
VREG
24
23
22
1
2
3
4
CP2
CP1
RANGE
NO
NC
CONNECTION
θ
PHASE and ENABLE input terminals are provided for use in
controlling the speed and direction of a dc motor with externally
applied PWM-control signals. The ENABLE input can be
programmed via the serial port to PWM the bridge in fast or slow
current decay. Internal synchronous rectification control circuitry is
provided to reduce power dissipation during PWM operation.
PHASE
OSC
21 OUT
B
V
BB 20 LOAD SUPPLY
5
6
7
8
GROUND
19
18
GROUND
GROUND
SENSE
GROUND
LOGIC SUPPLY
V
CC
17
16
9
ENABLE
DATA
OUT
A
Internal circuit protection includes thermal shutdown with
hysteresis, and crossover-current protection. Special power-up
sequencing is not required.
NO
NC
15
14
13
10
CONNECTION
MODE
CLOCK
11
12
÷
REF
The A3958SB/SLB is supplied in a choice of two power
packages, a 24-pin plastic DIP with a copper batwing tab (package
suffix ‘B’), and a 24-lead plastic SOIC with a copper batwing tab
(package suffix ‘LB’). In both cases, the power tab is at ground
potential and needs no electrical isolation.
STROBE
Dwg. PP-069
Note that the A3958SLB(SOIC) and A3958SB
(DIP) do not share a common terminal
assignment.
FEATURES
ABSOLUTE MAXIMUM RATINGS
I
2 A, 50 V Continuous Output Rating
Load Supply Voltage, VBB .................. 50 V
Output Current, IOUT........................ 2.0 A
Logic Supply Voltage, VDD ................ 7.0 V
Input Voltage, VIN .... -0.3 V to VDD + 0.3 V
Sense Voltage, VS ............................ 0.5 V
Reference Voltage, VREF .................. 2.7 V
Package Power Dissipation (TA = 25°C), PD
A3958SB ................................. 3.1 W*
A3958SLB ............................... 2.2 W*
Operating Temperature Range,
I Low rDS(on) Outputs (270 mΩ, Typical)
I Programmable Mixed, Fast, and Slow Current-Decay Modes
I Serial Interface Controls Chip Functions
I Synchronous Rectification for Low Power Dissipation
I Internal UVLO and Thermal-Shutdown Circuitry
I Crossover-Current Protection
TA ............................... -20°C to +85°C
Junction Temperature,
TJ ............................................ +150°C
Storage Temperature Range,
TS ............................. -55°C to +150°C
Always order by complete part number:
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.
Part Number
A3958SB
Package
RθJA
RθJT
24-pin batwing DIP
24-lead batwing SOIC
40°C/W
56°C/W
6°C/W
6°C/W
* Per SEMI G42-88 Specification.
A3958SLB
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
V
BB
VDD
+
LOGIC
SUPPLY
LOAD
SUPPLY
CHARGE PUMP
BANDGAP
VREG
CHARGE
PUMP
UNDER-
VOLTAGE &
BANDGAP
REGULATOR
VDD
FAULT DETECT
CREG
TSD
CONTROL LOGIC
OUT
A
B
MODE
PHASE
ENABLE
OUT
SENSE
C
S
ZERO
CURRENT
DETECT
FIXED OFF
RS
BLANK
DECAY
OSC
PROGRAMMABLE
PWM TIMER
CURRENT
SENSE
SLEEP
MODE
CLOCK
DATA
STROBE
REFERENCE
BUFFER &
DIVIDER
SERIAL
PORT
RANGE
REF
VREF
RANGE
Dwg. FP-048
CP2
CP1
CP
1
2
24
23
22
21
CHARGE PUMP
VREG
θ
RANGE
PHASE
OSC
3
4
OUT
B
LOAD
SUPPLY
V
A3958SB
GROUND
GROUND
5
6
7
8
BB 20
Note that the A3958SLB (SOIC) and A3958SB
(DIP) do not share a common terminal
assignment.
GROUND
GROUND
SENSE
19
18
GROUND
GROUND
17
16
15
14
13
LOGIC
SUPPLY
9
V
OUTA
DD
MODE
REF
ENABLE
10
÷
DATA
11
12
SERIAL PORT
STROBE
CLOCK
Dwg. PP-069-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, Allegro MicroSystems, Inc.
2
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 50 V, VDD = 5.0 V, VSENSE = 0.5 V,
fPWM < 50 kHz (unless noted otherwise)
Limits
Characteristics
Symbol Test Conditions
Min. Typ. Max. Units
Output Drivers
Load Supply Voltage Range
VBB
Operating
20
0
–
–
–
–
–
–
–
–
–
–
–
50
50
V
V
During sleep mode
VOUT = VBB
Output Leakage Current
Output On Resistance
Body Diode Forward Voltage
Load Supply Current
IDSS
<1.0 20
<-1.0 -20
270 300
270 300
µA
µA
mΩ
mΩ
V
VOUT = 0 V
rDS(on) Source driver, IOUT = -2 A
Sink driver, IOUT = 2 A
VF
Source diode, IF = -2 A
Sink diode, IF = 2 A
fPWM < 50 kHz
1.2
1.2
4.0
2.0
–
1.6
1.6
7.0
5.0
20
V
IBB
mA
mA
µA
Charge pump on, outputs disabled
Sleep Mode
Control Logic
Logic Supply Voltage Range
Logic Input Voltage
VDD
VIN(1)
VIN(0)
IIN(1)
IIN(0)
IIN(1)
IIN(0)
fOSC
Operating
4.5
2.0
–
5.0
–
5.5
–
V
V
–
0.8
V
Logic Input Current
(all inputs except ENABLE)
VIN = 2.0 V
VIN = 0.8 V
VIN = 2.0 V
VIN = 0.8 V
Operating
–
<1.0 20
<-2.0 -20
µA
µA
µA
µA
MHz
%
–
ENABLE Input Current
–
40
–
100
0
–
OSC input frequency
OSC input duty cycle
OSC input hysteresis
Input Hysterisis
2.9
40
200
50
0.0
–
–
6.1
60
dcOSC Operating
–
–
–
Operating
–
400
100
2.6
0.5
5.0
mV
mV
V
All digital inputs except OSC
Operating
–
Reference Input Volt. Range
Reference Input Current
Comparator Input Offset Volt.
VREF
IREF
VIO
–
VREF = 2.5 V
–
µA
mV
VREF = 0 V
–
0
Continued next page …
www.allegromicro.com
3
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 50 V, VDD = 5.0 V, VSENSE = 0.5 V,
fPWM < 50 kHz (unless noted otherwise), continued.
Limits
Characteristics
Symbol Test Conditions
Min. Typ. Max. Units
Control Logic
Buffer Input Offset Volt.
Reference Divider Ratio
VIO
–
0
15
mV
–
–
D14 = High
9.9
10 10.2
D14 = Low
4.95 5.0 5.05
–
Propagation Delay Times
tpd
PWM change to source ON
PWM change to source OFF
PWM change to sink ON
PWM change to sink OFF
Phase change to sink ON
Phase change to sink OFF
Phase change to source ON
Phase change to source OFF
–
–
–
–
–
–
–
–
–
–
600
100
600
100
600
100
600
100
165
15
–
–
–
–
–
–
–
–
–
–
ns
ns
ns
ns
ns
ns
ns
ns
°C
°C
V
Thermal Shutdown Temp.
TJ
Thermal Shutdown Hysteresis
∆TJ
UVLO
Enable
ThresholdUVLO Increasing
V
3.90 4.2 4.45
DD
UVLO Hysteresis
∆UVLO
0.05 0.10
–
V
Logic Supply Current
IDD
fPWM < 50 kHz
Sleep Mode, Inputs < 0.5 V
NOTES: 1. Typical Data is for design information only.
–
–
6.0
–
10
2.0
mA
mA
2. Negative current is defined as coming out of (sourcing) the specified device terminal.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL DESCRIPTION
D7 – D10 Fast Decay Time. A four-bit word sets the
fast-decay portion of the fixed-off time for the internal
PWM control circuitry. This will only have impact if the
mixed-decay mode is selected (via bit D17 and the MODE
input terminal). For tfd > toff, the device will effectively
operate in the fast-decay mode. The fast decay portion is
defined by
Serial Interface. The A3958 is controlled via a 3-wire
(clock, data, strobe) serial port. The programmable
functions allow maximum flexibility in configuring the
PWM to the motor drive requirements. The serial data is
clocked in starting with D19.
Bit Function
D0 Blank Time LSB
D1 Blank Time MSB
D2 Off Time LSB
tfd = (8[1 + N]/fosc) - 1/fosc
where N = 0 … 15
D3 Off Time Bit 1
D4 Off Time Bit 2
D5 Off Time Bit 3
D6 Off Time MSB
For example, with an oscillator frequency of 4 MHz, the
fast decay time will be adjustable from 1.75 µs to
31.75 µs in increments of 2 µs.
D11 Synchronous Rectification Mode. The active
mode prevents reversal of load current by turning off
synchronous rectification when a zero current level is
detected. The passive mode will allow reversal of current
but will turn off the synchronous rectifier circuit if the
load current inversion ramps up to the current limit set by
VREF/RS.
D7 Fast Decay Time LSB
D8 Fast Decay Time Bit 1
D9 Fast Decay Time Bit 2
D10 Fast Decay Time MSB
D11 Sync. Rect. Mode
D12 Sync. Rect. Enable
D13 External PWM Mode
D14 Enable
D11
Mode
D15 Phase
0
1
Active
Passive
D16 Reference Range Select
D17 Internal PWM Mode
D18 Test Use Only
D19 Sleep Mode
D12 Synchronous Rectification Enable.
D12 Synchronous Rect.
D0 – D1 Blank Time. The current-sense comparator is
blanked when any output driver is switched on, according
to the table below. fosc is the oscillator input frequency.
0
1
Disabled
Enabled
D13 External PWM Decay Mode. Bit D13 determines
the current-decay mode when using ENABLE chopping
for external PWM current control.
D1
D0
Blank Time
0
0
1
1
0
1
0
1
4/fosc
6/fosc
12/fosc
24/fosc
D13
0
1
Mode
Fast
Slow
D2 – D6 Fixed-Off Time. A five-bit word sets the
fixed-off time for internal PWM current control. The off
time is defined by
D14 Enable Logic. Bit D14, in conjunction with
ENABLE, determines if the output drivers are in the
chopped (OFF)(ENABLE = D14) or ON (ENABLE ≠
D14) state.
t
off = (8[1 + N]/fosc) - 1/fosc
where N = 0 … 31
ENABLE D14
Mode
Chopped
On
On
Chopped
For example, with an oscillator frequency of 4 MHz, the
off time will be adjustable from 1.75 µs to 63.75 µs in
increments of 2 µs.
0
1
0
1
0
0
1
1
www.allegromicro.com
5
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL DESCRIPTION (continued)
D15 Phase Logic. Bit D15, in conjunction with
PHASE, determines if the device is operating in the
forward (PHASE ≠ D15) or reverse (PHASE = D15) state.
D18 Test Mode. Bit D18 low (default) operates the
device in normal mode. D18 is only used for testing
purposes. The user should never change this bit.
PHASE D15 State
OUTA OUTB
Low High
Low
Low
High
D19 Sleep Mode. Bit D19 selects a Sleep mode to
minimize power consumption when not in use. This
disables much of the internal circuitry including the
regulator and charge pump. On power up the serial port is
initialized to all 0s. Bit D19 should be programmed high
for 1 ms before attempting to enable any output driver.
0
1
0
1
0
0
1
1
Reverse
ForwardHigh
ForwardHigh
Reverse
Low
D16 Gm Range Select. Bit D16, in conjunction with
RANGE, determines if VREF is divided by 5 (RANGE ≠
D16) or by 10 (RANGE = D16).
D19
Sleep Mode
0
1
Sleep
Normal
RANGE
D16
Divider
Serial Port Write Timing Operation. Data is clocked
into the shift register on the rising edge of the CLOCK
signal. Normally STROBE will be held high, only
brought low to initiate a write cycle. Refer to diagram
below and these specifications for the minimum timing
requirements.
0
1
0
1
0
0
1
1
÷10
÷5
÷5
÷10
D17 Internal PWM Mode. Bit D17, in conjunction with
MODE, selects slow (MODE ≠ D17) or mixed (MODE =
D17) current decay.
A. DATA setup time ......................................... 15 ns
B. DATA hold time........................................... 10 ns
C. Setup STROBE to CLOCK rising edge ....... 50 ns
D. CLOCK high pulse width ............................ 50 ns
E. CLOCK low pulse width .............................. 50 ns
F. Setup CLOCK rising edge to STROBE ....... 50 ns
G. STROBE pulse width................................... 50 ns
MODE D17 Current-Decay Mode
0
1
0
1
0
0
1
1
Mixed
Slow
Slow
Mixed
Serial Port Write Timing
STROBE
CLOCK
E
C
D
F
G
A
B
D19
D18
D0
DATA
Dwg. WP-038
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL DESCRIPTION (continued)
Synchronous Rectification. When a PWM off cycle
is triggered, either by an ENABLE chop command or
internal fixed off-time cycle, load current will recirculate
according to the decay mode selected by the control logic.
The A3958 synchronous rectification feature will turn on
the opposite pair of DMOS outputs during the current
decay and effectively short out the body diodes with the
low rDS(on) driver. This will reduce power dissipation
significantly and can eliminate the need for external
Schottky diodes.
VREG. This internally generated voltage is used to operate
the sink-side DMOS outputs. The VREG terminal should
be decoupled with a 0.22 µF capacitor to ground. VREG is
internally monitored and in the case of a fault condition,
the outputs of the device are disabled.
Charge Pump. The charge pump is used to generate a
gate-supply voltage greater than VBB to drive the source-
side DMOS gates. A 0.22 µF ceramic capacitor should be
connected between CP1 and CP2 for pumping purposes.
A 0.22 µF ceramic capacitor should be connected between
CP and VBB to act as a reservoir to operate the high-side
DMOS devices. The CP voltage is internally monitored
and, in the case of a fault condition, the source outputs of
the device are disabled.
Synchronous rectification can be configured in active
mode, passive mode, or disabled via the serial port (bits
D11 and D12).
The active or passive mode selection has no impact in
slow-decay mode. With synchronous rectification
enabled, the slow-decay mode serves as an effective brake
mode.
Shutdown. In the event of a fault (excessive junction
temperature, or low voltage on CP or VREG) the outputs of
the device are disabled until the fault condition is
removed. At power up, and in the event of low VDD, the
UVLO circuit disables the drivers and resets the data in
the serial port to all zeros.
Current Regulation. Load current is regulated by an
internal fixed off-time PWM control circuit. When the
outputs of the DMOS H bridge are turned on, the current
increases in the motor winding until it reaches a trip value
determined by the external sense resistor (RS), the applied
analog reference voltage (VREF), the RANGE logic level,
and serial data bit D16:
PWM Timer Function. The PWM timer is
programmable via the serial port (bits D2 – D10) to
provide off-time PWM signals to the control circuitry. In
the mixed current-decay mode, the first portion of the off
time operates in fast decay, until the fast decay time count
(serial bits D7 – D10) is reached, followed by slow decay
for the rest of the off-time period (bits D2 – D6). If the
fast decay time is set longer than the off time, the device
effectively operates in fast decay mode. Bit D17, in
conjunction with MODE, selects mixed or slow decay.
When RANGE = D16 ........... ITRIP = VREF/10RS
When RANGE ≠ D16 ........... ITRIP = VREF/5RS
At the trip point, the sense comparator resets the source-
enable latch, turning off the source driver. The load
inductance then causes the current to recirculate for the
serial-port-programmed fixed off-time period. The
current path during recirculation is determined by the
configuration of slow/mixed current-decay mode (D17)
and the synchronous rectification control bits (D11 and
D12).
PWM Blank Timer. When a source driver turns on, a
current spike occurs due to the reverse recovery currents
of the clamp diodes and/or switching transients related to
distributed capacitance in the load. To prevent this current
spike from erroneously resetting the source-enable latch,
the sense comparator is blanked. The blank timer runs
after the off-time counter (see bits D2 – D6) to provide the
programmable blanking function. The blank timer is reset
when ENABLE is chopped or PHASE is changed. For
external PWM control, a PHASE change or ENABLE on
will trigger the blanking function.
www.allegromicro.com
7
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
APPLICATIONS INFORMATION
Current Sensing. To minimize inaccuracies in sensing
the ITRIP current level, which may be caused by ground
trace IR drops, the sense resistor should have an
independent ground return to the ground terminal of the
device. For low-value sense resistors the IR drops in the
PCB sense resistor’s traces can be significant and should
be taken into account. The use of sockets should be
avoided as they can introduce variation in RS due to their
contact resistance.
The maximum value of RS is given as RS ≤ 0.5/ITRIP
.
Braking. The braking function is implemented by
driving the device in slow-decay mode via serial port bit
D13, enabling synchronous rectification via bit D12, and
chopping with the combination of D14 and the ENABLE
input terminal. Because it is possible to drive current in
either direction through the DMOS drivers, this
configuration effectively shorts out the motor-generated
BEMF as long as the ENABLE chop mode is asserted. It
is important to note that the internal PWM current-control
circuit will not limit the current when braking, because the
current does not flow through the sense resistor. The
maximum brake current can be approximated by VBEMF
RL. Care should be taken to ensure that the maximum
ratings of the device are not exceeded in worst-case
braking situations of high speed and high inertial loads.
/
Thermal Protection. Circuitry turns off all drivers
when the junction temperature reaches 165°C typically. It
is intended only to protect the device from failures due to
excessive junction temperatures and should not imply that
output short circuits are permitted. Thermal shutdown has
a hysteresis of approximately 15°C.
Layout. The printed wiring board should use a heavy
ground plane. For optimum electrical and thermal perfor-
mance, the driver should be soldered directly onto the
board. The ground side of RS should have an individual
path to the ground terminals of the device. This path
should be as short as is possible physically and should not
have any other components connected to it. It is recom-
mended that a 0.1 µF capacitor be placed between SENSE
and ground as close to the device as possible; the load
supply terminal, VBB, should be decoupled with an
electrolytic capacitor (> 47 µF is recommended) placed as
close to the device as is possible.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
Terminal List
A3958SLB A3958SB
Terminal Name Terminal Description
(SOIC)
1
(DIP)
CP
Reservoir capacitor (typically 0.22 µF)
The charge pump capacitor (typically 0.22 µF)
Logic input for direction control (see also D15)
Logic-level oscillator (square wave) input
Grounds
24
CP1 & CP2
PHASE
OSC
2 & 3
4
1 & 2
3
4
5
GROUND
6, 7
8
5, 6, 7, 8*
9
LOGIC SUPPLY VDD, the low voltage (typically 5 V) supply
ENABLE
DATA
Logic input for enable control (see also D14)
Logic-level input for serial interface
9
10
10
11
CLOCK
Logic input for serial port (data is entered on rising edge)
Logic input for serial port (active on rising edge)
VREF, the load current reference input volt. (see also D16)
Logic input for PWM mode control (see also D17)
No (Internal) Connection
11
12
STROBE
REF
12
13
13
14
MODE
14
15
NO CONNECT
OUTA
15
—
One of two DMOS bridge outputs to the motor
Sense resistor
16
16
SENSE
17
17
GROUND
LOAD SUPPLY
OUTB
Grounds
18, 19
20
18, 19*
20
VBB, the high-current, 20 V to 50 V, motor supply
One of two DMOS bridge outputs to the motor
No (Internal) connection
21
21
NO CONNECT
RANGE
22
—
Logic Input for VREF range control (see also D16)
Regulator decoupling capacitor (typically 0.22 µF)
23
22
VREG
24
23
* For the A3958SB DIP only, there is an indeterminate resistance between the substrate grounds (pins 6, 7, 18,
and 19) and the grounds at pins 5 and 8. Pins 5 and 8, and 6, 7, 18, or 19 must be connected together externally.
www.allegromicro.com
9
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
A3958SB
Dimensions in Inches
(controlling dimensions)
0.014
0.008
NOTE 1
24
13
0.430
MAX
0.280
0.240
0.300
BSC
1
6
7
12
0.100
BSC
0.070
0.045
0.005
MIN
1.280
1.230
0.210
MAX
0.015
MIN
0.150
0.115
0.022
0.014
Dwg. MA-001-25A in
Dimensions in Millimeters
(for reference only)
0.355
0.204
NOTE 1
24
13
10.92
MAX
7.11
6.10
7.62
BSC
1
6
7
12
2.54
BSC
1.77
1.15
0.13
MIN
32.51
31.24
5.33
MAX
0.39
MIN
3.81
2.93
0.558
0.356
Dwg. MA-001-25A mm
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Lead spacing tolerance is non-cumulative.
4. Lead thickness is measured at seating plane or below.
5. Supplied in standard sticks/tubes of 15 devices.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
A3958SLB
Dimensions in Inches
(for reference only)
24
13
0.0125
0.0091
0.491
0.394
0.2992
0.2914
0.050
0.016
1
2
3
0.020
0.013
0.050
0.6141
0.5985
0° TO 8
BSC
NOTE 1
NOTE 3
0.0926
0.1043
Dwg. MA-008-25 in
0.0040MIN
.
Dimensions in Millimeters
(controlling dimensions)
24
13
0.32
0.23
10.65
10.00
7.60
7.40
1.27
0.40
1
2
3
0.51
0.33
1.27
15.60
15.20
0° TO 8
BSC
NOTE 1
NOTE 3
2.65
2.35
Dwg. MA-008-25A mm
0.10 MIN
.
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
4. Supplied in standard sticks/tubes of 31 devices or add “TR” to part number for tape and reel.
www.allegromicro.com
11
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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