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부품번호 3953 기능
기능 FULL-BRIDGE PWM MOTOR DRIVER
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3953 데이터시트, 핀배열, 회로
3953
FULL-BRIDGE PWM MOTOR DRIVER
BRAKE 1
REF 2
VBB
RC 3
GROUND 4
GROUND 5
LOGIC
SUPPLY
6
VCC
PHASE 7
ENABLE 8
LOGIC
VBB
16
LOAD
SUPPLY
15 OUTB
14 MODE
13 GROUND
12 GROUND
11 SENSE
10 OUTA
LOAD
9 SUPPLY
Dwg. PP-056
Note the A3953SB (DIP) and the A3953SLB
(SOIC) are electrically identical and share a
common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, VBB . . . . . . . . . . 50 V
Output Current, IOUT
(Continuous) . . . . . . . . . . . . . . ±1.3 A*
Logic Supply Voltage, VCC . . . . . . . . . 7.0 V
Logic/Reference Input Voltage Range,
VIN . . . . . . . . . . . -0.3 V to VCC + 0.3 V
Sense Voltage, VSENSE
(VCC = 5.0 V) . . . . . . . . . . . . . . . . 1.0 V
(VCC = 3.3 V) . . . . . . . . . . . . . . . . 0.4 V
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . -20˚C to +85˚C
Junction Temperature, TJ . . . . . . . +150˚C†
Storage Temperature 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.
† Fault conditions that produce excessive junction
temperature will activate the device’s thermal
shutdown circuitry. These conditions can be
tolerated but should be avoided.
Designed for bidirectional pulse-width modulated (PWM) current control
of inductive loads, the A3953S— is capable of continuous output currents to
±1.3 A and operating voltages to 50 V. Internal fixed off-time PWM current-
control circuitry can be used to regulate the maximum load current to a
desired value. The peak load current limit is set by the user’s selection of an
input reference voltage and external sensing resistor. The fixed off-time pulse
duration is set by a user- selected external RC timing network. Internal circuit
protection includes thermal shutdown with hysteresis, transient-suppression
diodes, and crossover current protection. Special power-up sequencing is not
required.
With the ENABLE input held low, the PHASE input controls load current
polarity by selecting the appropriate source and sink driver pair. The MODE
input determines whether the PWM current-control circuitry operates in a
slow current-decay mode (only the selected source driver switching) or in a
fast current-decay mode (selected source and sink switching). A user-
selectable blanking window prevents false triggering of the PWM current-
control circuitry. With the ENABLE input held high, all output drivers are
disabled. A sleep mode is provided to reduce power consumption.
When a logic low is applied to the BRAKE input, the braking function is
enabled. This overrides ENABLE and PHASE to turn off both source drivers
and turn on both sink drivers. The brake function can be used to dynamically
brake brush dc motors.
The A3953S— is supplied in a choice of two power packages; a 16-pin
dual-in-line plastic package with copper heat-sink tabs, and a 16-lead plastic
SOIC with copper heat-sink tabs. For both package styles, the power tab is at
ground potential and needs no electrical isolation.
FEATURES
I ±1.3 A Continuous Output Current I Sleep (Low Current
I 50 V Output Voltage Rating
Consumption) Mode
I 3 V to 5.5 V Logic Supply Voltage I Internal Transient-
I Internal PWM Current Control
Suppression Diodes
I Saturated Sink Drivers (Below 1 A) I Internal Thermal-
I Fast and Slow Current-Decay Modes Shutdown Circuitry
I Automotive Capable
I Crossover-Current
and UVLO Protection
Always order by complete part number:
Part Number
Package
A3953SB
16-Pin DIP
A3953SLB
16-Lead SOIC
RθJA
43°C/W
67°C/W
RθJT
6°C/W
6°C/W




3953 pdf, 반도체, 판매, 대치품
3953
FULL-BRIDGE
PWM MOTOR DRIVER
ELECTRICAL CHARACTERISTICS 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.
tOFF RC
tPWM(OFF)
tPWM(ON)
tON(min)
tpd
tCODT
fPWM(max)
CT = 680 pF, RT= 30 k, 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 k, CT = 680 pF
VCC = 5.0 V, RT 12 k, 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 kLoad to 25 V, VBB = 50 V
IOUT = 1.3 A
18.3
0.8
0.8
0.3
70
20.4
1.0
1.8
0.4
0.55
1.4
1.6
1.0
1.0
1.0
0.8
2.4
0.8
2.0
1.7
1.5
22.5
1.5
2.6
0.7
0.85
1.9
2.0
3.0
Units
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
kHz
Continued next page
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036 (508) 853-5000

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3953 전자부품, 판매, 대치품
3953
FULL-BRIDGE
PWM MOTOR DRIVER
During braking, when the MODE input is high, the
peak current limit can be approximated by:
ITRIP BRAKE MH
VREF
RS
CAUTION: Because the kinetic energy stored in the motor
and load inertia is being converted into current, which
charges the VBB supply bulk capacitance (power supply
output and decoupling capacitance), care must be taken
to ensure the capacitance is sufficient to absorb the
energy without exceeding the voltage rating of any
devices connected to the motor supply.
Brake Operation - MODE Input Low. During braking,
with the MODE input low, the internal current-control
circuitry is disabled. Therefore, care should be taken to
ensure that the motors current does not exceed the
ratings of the device. The braking current can be mea-
sured by using an oscilloscope with a current probe
connected to one of the motors leads, or if the back-EMF
voltage of the motor is known, approximated by:
IPEAK BRAKE ML
VBEMF 1V
RLOAD
RC Fixed Off-Time. The internal PWM current-control
circuitry uses a one shot to control the time the driver(s)
remain(s) off. The one-shot time, tOFF (fixed off-time), is
determined by the selection of an external resistor (RT)
and capacitor (CT) connected in parallel from the RC
timing terminal to ground. The fixed off-time, over a range
of values of CT = 470 pF to 1500 pF and RT = 12 kto
100 k, is approximated by:
tOFF RT x CT
The operation of the circuit is as follows: when the
PWM latch is reset by the current comparator, the voltage
on the RC terminal will begin to decay from approximately
0.60VCC. When the voltage on the RC terminal reaches
approximately 0.22VCC, the PWM latch is set, thereby
enabling the driver(s).
RC Blanking. In addition to determining the fixed off-time
of the PWM control circuit, the CT component sets the
comparator blanking time. This function blanks the output
of the comparator when the outputs are switched by the
internal current-control circuitry (or by the PHASE,
BRAKE, or ENABLE inputs). The comparator output is
blanked to prevent false over-current detections due to
reverse recovery currents of the clamp diodes, and/or
switching transients related to distributed capacitance in
the load.
During internal PWM operation, at the end of the tOFF
time, the comparators output is blanked and CT begins to
be charged from approximately 0.22VCC by an internal
current source of approximately 1 mA. The comparator
output remains blanked until the voltage on CT reaches
approximately 0.60VCC.
When a transition of the PHASE input occurs, CT is
discharged to near ground during the crossover delay
time (the crossover delay time is present to prevent
simultaneous conduction of the source and sink drivers).
After the crossover delay, CT is charged by an internal
current source of approximately 1 mA. The comparator
output remains blanked until the voltage on CT reaches
approximately 0.60VCC.
When the device is disabled, via the ENABLE input,
CT is discharged to near ground. When the device is re-
enabled, CT is charged by an internal current source of
approximately 1 mA. The comparator output remains
blanked until the voltage on CT reaches approximately
0.60VCC.
For 3.3 V operation, the minimum recommended
value for CT is 680 pF ± 5 %. For 5.0 V operation, the
minimum recommended value for CT is 470 pF ± 5%.
These values ensure that the blanking time is sufficient to
avoid false trips of the comparator under normal operating
conditions. For optimal regulation of the load current, the
above values for CT are recommended and the value of
RT can be sized to determine tOFF. For more information
regarding load current regulation, see below.
www.allegromicro.com
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관련 데이터시트

부품번호상세설명 및 기능제조사
3951

FULL-BRIDGE PWM MOTOR DRIVER

Allegro MicroSystems
Allegro MicroSystems
3952

FULL-BRIDGE PWM MOTOR DRIVER

Allegro MicroSystems
Allegro MicroSystems

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