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A3959SLB Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A3959SLB
Beschreibung DMOS FULL-BRIDGE PWM MOTOR DRIVER
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
A3959SLB Datasheet, Funktion
3959
DMOS FULL-BRIDGE PWM
MOTOR DRIVER
A3959SLB (SOIC)
CP 1
CP2 2
CP1 3
PHASE
θ
4
ROSC 5
GROUND 6
GROUND 7
LOGIC SUPPLY 8 VDD
ENABLE 99
PFD2 10
BLANK 11
PFD1 12
24 VREG
23 SLEEP
NC 22
NO
CONNECTION
21 OUTB
VBB 20 LOAD SUPPLY
19 GROUND
18 GROUND
17 SENSE
16 OUTA
NC
15
NO
CONNECTION
14 EXT MODE
÷10 13 REF
Dwg. PP-069-4
Note that the A3959SLB(SOIC), A3959SB (DIP),
and A3959SLP (TSSOP) do not share a common
terminal assignment.
ABSOLUTE MAXIMUM RATINGS
Designed for pulse-width modulated (PWM) current control of dc
motors, the A3959SB, A3959SLB, and A3959SLP are capable of
output currents to ±3 A and operating voltages to 50 V. Internal fixed
off-time PWM current-control timing circuitry can be adjusted via
control inputs to operate in slow, fast, and mixed current-decay modes.
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. Internal synchronous rectification
control circuitry is provided to reduce power dissipation during PWM
operation.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage monitoring of supply and charge pump, and
crossover-current protection. Special power-up sequencing is not
required.
The A3959SB/SLB/SLP is a choice of three power packages, a
24-pin plastic DIP with a copper batwing tab (package suffix ‘B’), a
24-lead plastic SOIC with a copper batwing tab (package suffix ‘LB’),
and a thin (<1.2 mm) 28-lead plastic TSSOP with an exposed thermal
pad (suffix ‘LP’). In all cases, the power tab is at ground potential and
needs no electrical isolation. Each package is available in a lead-
free version (100% matte tin leadframe).
Load Supply Voltage, VBB ......................... 50 V
Output Current, IOUT (Repetitive) ........... ±3.0 A
(Peak, <3 µs) ................................... ±6.0 A
Logic Supply Voltage, VDD ....................... 7.0 V
Logic Input Voltage Range, VIN
(Continuous) ............ -0.3 V to VDD + 0.3 V
(tw <30 ns) ............... -1.0 V to VDD + 1.0 V
Sense Voltage, VS (Continuous) .............. 0.5 V
(tw <3 µs) ........................................... 2.5 V
Reference Voltage, VREF ............................ VDD
Package Power Dissipation (TA = 25°C), PD
A3959SB ........................................ 3.3 W*
A3959SLB ...................................... 2.5 W*
A3959SLP ...................................... 3.1 W*
Operating Temp. Range, TA .... -20°C to +85°C
Junction Temperature, TJ ..................... +150°C
Storage Temp. 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.
FEATURES
s ±3 A, 50 V Output Rating
s Low rDS(on) Outputs (270 m, Typical)
s Mixed, Fast, and Slow Current-Decay Modes
s Synchronous Rectification for Low Power Dissipation
s Internal UVLO and Thermal-Shutdown Circuitry
s Crossover-Current Protection
s Internal Oscillator for Digital PWM Timing
Always order by complete part number:
Part Number
A3959SB
Package
24-pin batwing DIP
RθJA*
38°C/W
A3959SB-T 24-pin batwing DIP; Lead-free
38°C/W
A3959SLB
24-lead batwing SOIC
50°C/W
A3959SLB-T 24-lead batwing SOIC; Lead-free 50°C/W
A3959SLP
28-lead thin shrink SOIC
40°C/W
A3959SLP-T 28-lead thin shrink SOIC; Lead-free 40°C/W
RθJT
6°C/W
6°C/W
6°C/W
6°C/W
* Double-sided board, one square inch copper each side. See also, Layout, page 7.






A3959SLB Datasheet, Funktion
3959
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL DESCRIPTION (continued)
Internal Current-Control Mode. Inputs PFD1 and
PFD2 determine the current-decay method after an
overcurrent event is detected at the SENSE input. In
slow-decay mode, both sink drivers are turned on for the
fixed off-time period. Mixed-decay mode starts out in
fast-decay mode for a portion (15% or 48%) of the fixed
off time, and then is followed by slow decay for the
remainder of the period.
PFD2
0
PFD1
0
% toff
0
Decay
Slow
01
15 Mixed
10
48 Mixed
1 1 100 Fast
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 to provide the 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.
The duration is determined by the BLANK input and the
oscilator.
BLANK
0
1
tblank
6/fosc
12/fosc
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 A3959 synchronous rectification feature will turn on
the appropriate 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.
Synchronous rectification will prevent reversal of load
current by turning off all outputs when a zero-current level
is detected.
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.
Braking. The braking function is implemented by
driving the device in slow-decay mode via EXTMODE
and applying an enable chop command. 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.
SLEEP Logic. The SLEEP input terminal is used to
minimize power consumption when when not in use. This
disables much of the internal circuitry including the
regulator and charge pump. Logic low will put the device
into sleep mode, logic high will allow normal operation.
115 Northeast Cutoff, Box 15036
6 Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









A3959SLB pdf, datenblatt
3959
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
MOTOR DRIVERS
Function
Output Ratings*
Part Number
INTEGRATED CIRCUITS FOR BRUSHLESS DC MOTORS
3-Phase Power MOSFET Controller
— 28 V
3933
3-Phase Power MOSFET Controller
— 40 V
3935
3-Phase Power MOSFET Controller
— 50 V
3932 & 3938
3-Phase Back-EMF Controller/Driver
±900 mA
14 V
8904
3-Phase PWM Current-Controlled DMOS Driver
±3.0 A
50 V
3936
INTEGRATED BRIDGE DRIVERS FOR DC AND BIPOLAR STEPPER MOTORS
PWM Current-Controlled Dual Full Bridge
±500 mA
18 V
3965
Dual Full Bridge with Protection & Diagnostics
±500 mA
30 V
3976
PWM Current-Controlled Dual Full Bridge
±650 mA
30 V
3966
PWM Current-Controlled Dual Full Bridge
±650 mA
30 V
3968
Microstepping Translator/Dual Full Bridge
±750 mA
30 V
3967
PWM Current-Controlled Dual Full Bridge
±750 mA
45 V
2916
PWM Current-Controlled Dual Full Bridge
±750 mA
45 V
2919
PWM Current-Controlled Dual Full Bridge
±750 mA
45 V
6219
PWM Current-Controlled Dual Full Bridge
±800 mA
33 V
3964
PWM Current-Controlled Dual DMOS Full Bridge
±1.0 A
35 V
3973
PWM Current-Controlled Full Bridge
±1.3 A
50 V
3953
PWM Current-Controlled Dual Full Bridge
±1.5 A
45 V
2917
PWM Current-Controlled DMOS Full Bridge
±1.5 A
50 V
3948
PWM Current-Controlled Microstepping Full Bridge
±1.5 A
50 V
3955
PWM Current-Controlled Microstepping Full Bridge
±1.5 A
50 V
3957
PWM Current-Controlled Dual DMOS Full Bridge
±1.5 A
50 V
3972
PWM Current-Controlled Dual DMOS Full Bridge
±1.5 A
50 V
3974
PWM Current-Controlled Full Bridge
±2.0 A
50 V
3952
PWM Current-Controlled DMOS Full Bridge
±2.0 A
50 V
3958
Microstepping Translator/Dual DMOS Full Bridge
±2.5 A
35 V
3977
PWM Current-Controlled DMOS Full Bridge
±3.0 A
50 V
3959
UNIPOLAR STEPPER MOTOR & OTHER DRIVERS
Unipolar Stepper-Motor Translator/Driver
1.0 A
46 V
7050
Unipolar Stepper-Motor Translator/Driver
1.25 A
50 V
5804
Unipolar Stepper-Motor Quad Drivers
1.5 A
46 V
7024 & 7029
Unipolar Microstepper-Motor Quad Driver
1.5 A
46 V
7042
Unipolar Stepper-Motor Quad Driver
1.8 A
50 V
2540
Unipolar Stepper-Motor Translator/Driver
2.0 A
46 V
7051
Unipolar Stepper-Motor Quad Driver
3.0 A
46 V
7026
Unipolar Microstepper-Motor Quad Driver
3.0 A
46 V
7044
Unipolar Stepper-Motor Translator/Driver
3.0 A
46 V
7052
* Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits
or over-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output.
† Complete part number includes additional characters to indicate operating temperature range and package style.
Also, see 3175, 3177, 3235, and 3275 Hall-effect sensors for use with brushless dc motors.
115 Northeast Cutoff, Box 15036
12 Worcester, Massachusetts 01615-0036 (508) 853-5000

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