Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

3962 Datenblatt(PDF) 6 Page - Allegro MicroSystems

Teilenummer 3962
Bauteilbeschribung  DUAL FULL-BRIDGE PWM MOTOR DRIVER
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

3962 Datenblatt(HTML) 6 Page - Allegro MicroSystems

  3962 Datasheet HTML 1Page - Allegro MicroSystems 3962 Datasheet HTML 2Page - Allegro MicroSystems 3962 Datasheet HTML 3Page - Allegro MicroSystems 3962 Datasheet HTML 4Page - Allegro MicroSystems 3962 Datasheet HTML 5Page - Allegro MicroSystems 3962 Datasheet HTML 6Page - Allegro MicroSystems 3962 Datasheet HTML 7Page - Allegro MicroSystems 3962 Datasheet HTML 8Page - Allegro MicroSystems  
Zoom Inzoom in Zoom Outzoom out
 6 / 8 page
background image
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3962
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
dc servo motor applications as 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).
Miscellaneous Information. An internally generated dead
time prevents crossover currents that can occur when
switching phase.
Thermal protection circuitry turns OFF all drivers
should the junction temperature reach 165
°C (typical).
This is intended only to protect the device from failures
due to excessive junction temperatures and should not
imply that output short circuits are permitted. The hyster-
esis of the thermal shutdown circuit is approximately 15
°C.
APPLICATION NOTES
Current Sensing. The actual peak load current (IPEAK) will
be above the calculated value of ITRIP due to delays in the
turn off of the drivers. The amount of overshoot can be
approximated by:
where VBB is the motor supply voltage, VBEMF is the back-
EMF voltage of the load, RLOAD and LLOAD are the resis-
tance and inductance of the load respectively, and t PWM is
specified in the electrical characteristics table.
To minimize current sensing inaccuracies caused by
ground trace IR drops, each current-sensing resistor
should have a separate return to the ground terminal of the
device. For low-value sense resistors, the IR drops in the
PCB can be significant and should be taken into account.
The use of sockets should be avoided as their contact
resistance can cause variations in the effective value of
RS.
Generally, larger values of RS reduce the aforemen-
tioned effects but can result in excessive heating and
power loss in the sense resistor. The selected value of RS
should not cause the absolute maximum voltage rating of
1.0 V, for the SENSE terminal, to be exceeded. The
recommended value of RS is in the range of:
where tOFF = RTCT, RLOAD is the series resistance of the
load, VBB is the motor supply voltage and t ON(min)max is
specified in the electrical characteristics table. When the
motor is rotating, the back EMF generated will influence
the above relationship. For brush dc motor applications,
the current regulation is improved. For stepper motor
applications when the motor is rotating, the effect is
dependent on the polarity and magnitude of the motor’s
back EMF.
The following procedure can be used to evaluate the
worst case internal PWM load current regulation in the
system:
Set VREF to 0 volts. With the load connected and the
PWM current control operating in slow decay mode, use
an oscilloscope to measure the time the output is low
(sink ON) for the output that is chopping. This is the
typical minimum on time (tON(min)typ) for the device. The
CT then should be increased until the measured value of
tON(min) is equal to tON(min)max as specified in the electrical
characteristics table. When the new value of CT has been
set, the value of RT should be decreased so the value for
tOFF = RTCT (with the artificially increased value of CT)
is equal to the nominal design value. The worst-case load-
current regulation then can be measured in the system
under operating conditions.
PWM of the Phase and Enable Inputs. The PHASE and
ENABLE inputs can be pulse width modulated to regulate
load current. Typical propagation delays from the PHASE
and ENABLE inputs to transitions of the power outputs are
specified in the electrical characteristics table. If the
internal PWM current control is used, the comparator
blanking function is active during phase and enable
transitions. This eliminates false tripping of the over-
current comparator caused by switching transients
(see “RC Blanking” above).
Enable PWM. Toggling the ENABLE input turns ON and
OFF the selected source and sink drivers. The corre-
sponding pair of flyback and ground clamp diodes conduct
after the drivers are disabled, resulting in fast current
decay. When the device is enabled the internal current
control circuitry will be active and can be used to limit the
load current in a slow decay mode.
Phase PWM. Toggling the PHASE terminal selects which
sink/source pair is enabled, producing a load current that
varies with the duty cycle and remains continuous at all
times. This can have added benefits in bidirectional brush
(VBB – [(ITRIP • RLOAD) + VBEMF]) tPWM
LLOAD
IOS
0.5
ITRIPmax
± 50%
RS


Ähnliche Teilenummer - 3962

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Littelfuse
396 LITTELFUSE-396 Datasheet
81Kb / 2P
   SUBMINIATURE FUSES
logo
Energizer
396 ENERGIZER-396 Datasheet
534Kb / 1P
   Silver Oxide Batteries
logo
EDAC, All Rights Reserv...
396 EDAC-396 Datasheet
298Kb / 3P
   Card Edge Connectors 0.125” (3.175mm) Pitch
396-005-500-101 EDAC-396-005-500-101 Datasheet
298Kb / 3P
   Card Edge Connectors 0.125” (3.175mm) Pitch
396-005-500-102 EDAC-396-005-500-102 Datasheet
298Kb / 3P
   Card Edge Connectors 0.125” (3.175mm) Pitch
More results

Ähnliche Beschreibung - 3962

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Allegro MicroSystems
2919 ALLEGRO-2919_06 Datasheet
285Kb / 9P
   DUAL FULL-BRIDGE PWM MOTOR DRIVER
2916 ALLEGRO-2916 Datasheet
1Mb / 8P
   DUAL FULL-BRIDGE PWM MOTOR DRIVER
L6219DS ALLEGRO-L6219DS Datasheet
182Kb / 8P
   DUAL FULL-BRIDGE PWM MOTOR DRIVER
A3966 ALLEGRO-A3966 Datasheet
299Kb / 8P
   Dual Full-Bridge PWM Motor Driver
A2919 ALLEGRO-A2919 Datasheet
336Kb / 8P
   Dual Full-Bridge PWM Motor Driver
logo
AMtek SEMICONDUCTORS CO...
AM2170 AMTEK-AM2170 Datasheet
211Kb / 10P
   Dual Full-Bridge PWM Motor Driver
OCT. 2008 V1.2
logo
Allegro MicroSystems
2918 ALLEGRO-2918 Datasheet
191Kb / 8P
   DUAL FULL-BRIDGE PWM MOTOR DRIVER
3961 ALLEGRO-3961 Datasheet
91Kb / 10P
   DUAL FULL-BRIDGE PWM MOTOR DRIVER
A3964 ALLEGRO-A3964 Datasheet
347Kb / 7P
   Dual Full-Bridge PWM Motor Driver
A2916 ALLEGRO-A2916 Datasheet
315Kb / 8P
   DUAL FULL-BRIDGE PWM MOTOR DRIVER
More results


Html Pages

1 2 3 4 5 6 7 8


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com