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PDF A3953 Data sheet ( Hoja de datos )
| Número de pieza | A3953 | |
| Descripción | FULL-BRIDGE PWM MOTOR DRIVER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A3953
Full-Bridge PWM Motor Driver
Discontinued Product
This device is no longer in production. The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: January 30, 2012
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, refer to the A4973.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
1 page  
A3953
Full-Bridge PWM Motor Driver
ELECTRICAL CHARACTERISTICS (continued) at TJ = 25°C, VBB = 5 V to 50 V, VCC = 3.0 V to
5.5 V (unless otherwise noted.)
Characteristic
AC Timing
PWM RC Fixed Off-time
PWM Turn-Off Time
PWM Turn-On Time
PWM Minimum On Time
Propagation Delay Times
Crossover Dead Time
Maximum PWM Frequency
Symbol Test Conditions
Min.
Limits
Typ. Max.
Units
tOFF RC
tPWM(OFF)
tPWM(ON)
tON(min)
tpd
tCODT
fPWM(max)
CT = 680 pF, RT= 30 kΩ, VCC = 3.3 V
Comparator Trip to Source Off,
IOUT = 25 mA
Comparator Trip to Source Off,
IOUT = 1.3 A
IRC Charge On to Source On,
IOUT = 25 mA
IRC Charge On to Source On,
IOUT = 1.3 A
VCC = 3.3 V, RT ≥ 12 kΩ, CT = 680 pF
VCC = 5.0 V, RT ≥ 12 kΩ, CT = 470 pF
IOUT = ±1.3 A, 50% to 90%:
ENABLE On to Source On
ENABLE Off to Source Off
ENABLE On to Sink On
ENABLE Off to Sink Off (MODE = L)
PHASE Change to Sink On
PHASE Change to Sink Off
PHASE Change to Source On
PHASE Change to Source Off
1 kΩ Load to 25 V, VBB = 50 V
IOUT = 1.3 A
18.3 20.4 22.5
— 1.0 1.5
— 1.8 2.6
— 0.4 0.7
— 0.55 0.85
0.8 1.4 1.9
0.8 1.6 2.0
μs
μs
μs
μs
μs
μs
μs
— 1.0 — μs
— 1.0 — μs
— 1.0 — μs
— 0.8 — μs
— 2.4 — μs
— 0.8 — μs
— 2.0 — μs
— 1.7 — μs
0.3 1.5 3.0 μs
70 — — kHz
Continued next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
5 Page 
A3953
Full-Bridge PWM Motor Driver
the need to generate a variable analog voltage reference. In this
case, a dc voltage on the REF input is used typically to limit the
maximum load current.
In dc servo applications, which require accurate positioning
at low or zero speed, PWM of the PHASE input is selected
typically. This simplifies the servo control loop because the
transfer function between the duty cycle on the PHASE input and
the average voltage applied to the motor is more linear than in the
case of ENABLE PWM control (which produces a discontinuous
current at low current levels).
With bidirectional dc servo motors, the PHASE terminal can be
used for mechanical direction control. Similar to when braking
the motor dynamically, abrupt changes in the direction of a
rotating motor produces a current generated by the back-EMF.
The current generated will depend on the mode of operation. If
the internal current control circuitry is not being used, then the
maximum load current generated can be approximated by ILOAD =
(VBEMF + VBB)/RLOAD where VBEMF is proportional to the motor’s
speed. If the internal slow current-decay control circuitry is used,
then the maximum load current generated can be approximated
by ILOAD = VBEMF/RLOAD. For both cases care must be taken to
ensure that the maximum ratings of the device are not exceeded.
If the internal fast current-decay control circuitry is used, then the
load current will regulate to a value given by:
ILOAD = VREF/RS.
CAUTION: In fast current-decay mode, when the direction of
the motor is changed abruptly, the kinetic energy stored in the
motor and load inertia will be converted into current that charges
the VBB supply bulk capacitance (power supply output and
decoupling capacitance). Care must be taken to ensure that the
capacitance is sufficient to absorb the energy without exceeding
the voltage rating of any devices connected to the motor supply.
See also the Brake Operation section, above.
Soldering Considerations. The lead (Pb) free (100%
matte tin) plating on lead terminations is 100% backward-
compatible for use with traditional tin-lead solders of any
composition, at any temperature of soldering that has been
traditionally used for that tin-lead solder alloy. Further, 100%
matte tin finishes solder well with tin-lead solders even at
temperatures below 232°C. This is because the matte tin dissolves
easily in the tin-lead. Additional information on soldering is
available on the Allegro Web site, www.allegromicro.com.
Figure 4 — Typical Application
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A3953.PDF ] | |
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