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A6219DS 데이터시트 PDF




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부품번호 A6219DS 기능
기능 Dual Full-Bridge PWM Motor Driver
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A6219DS 데이터시트, 핀배열, 회로
A6219DS
www.DataSheet4U.com
Dual Full-Bridge PWM Motor Driver
Features and Benefits
Interchangeable with SGS L6219DS
750 mA Continuous Output Current
45 V Output Sustaining Voltage
Internal Clamp Diodes
Internal PWM Current Control
Low Output Saturation Voltage
Internal Thermal Shutdown Circuitry
Similar to Dual PBL3717, UC3770
Package: 24 pin SOICW (suffix LB)
Not to scale
Description
The L6219DS motor driver is designed to drive both windings
of a bipolar stepper motor or bidirectionally control two DC
motors. Both bridges are capable of sustaining 45 V and include
internal pulse-width modulation (PWM) control of the output
current to 750 mA. The outputs have been optimized for a low
output saturation voltage drop (less than 1.8 V total source
plus sink at 500 mA).
For PWM current control, the maximum output current is
determined by user selection of a reference voltage and sensing
resistor. Two logic-level inputs select output current limits of
0, 33, 67, or 100% of the maximum level. A PHASE input to
each bridge determines load current direction.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated
delays prevent crossover currents when switching current
direction. Special power-up sequencing is not required.Thermal
protection circuitry disables the outputs if the chip temperature
exceeds safe operating limits.
The L6219DS is supplied in a 24-pin surface-mountable SOIC,
with 4 internally-fused leads for maximum package power
dissipation in the smallest possible construction. It is lead (Pb)
free with 100% matte tin leadframe plating.
29319.43H
Typical Application
STEPPER
MOTOR
1
RS
CC
2
3
RC
4
5
6
2
7
FROM
μP
VREF
56 k7
RT
8
99
10 Q 2
11
12
820 pF
CT
VBB
1
24
23
RC
22
21
RS
CC
VBB
+
20
19
18
17
Q1 16
15
14
VCC 13
FROM
μP
VREF
+5 V
820 pF
CT
56 k7
RT
Dwg. EP-008B1




A6219DS pdf, 반도체, 판매, 대치품
L6219DS
Dual Full-Bridge PWM Motor Driverwww.DataSheet4U.com
ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ 150°C, VBB = 45 V, VCC = 4.75 V to 5.25 V,
VREF = 5.0 V (unless otherwise noted).
Characteristic
Output Drivers (OUTA or OUTB)
Motor Supply Range
Output Leakage Current
Symbol
VBB
ICEX
Output Sustaining Voltage
Output Saturation Voltage
VCE(sus)
VCE(SAT)
Clamp Diode Leakage Current
Clamp Diode Forward Voltage
Driver Supply Current
Control Logic
Input Voltage
Input Current
IR
VF
IBB(ON)
IBB(OFF)
VIN(1)
VIN(0)
IIN(1)
Reference Voltage Range
Current Limit Threshold
(at trip point)
VREF
VREF/ VCOMPIN
Thermal Shutdown Temperature
Total Logic Supply Current
Fixed Off-Time
TJ
ICC(ON)
ICC(OFF)
toff
Test Conditions
VOUT = VBB
VOUT = 0
IOUT = ±750 mA, L = 3.0 mH
Sink Driver, IOUT = +500 mA
Sink Driver, IOUT = +750 mA
Source Driver, IOUT = -500 mA
Source Driver, IOUT = -750 mA
VR = 45 V
IF = 750 mA
Both Bridges On, No Load
Both Bridges Off
All inputs
All inputs
VIN = 2.4 V
VIN = 0.8 V
Operating
I0 = I1 = 0.8 V
I0 = 2.4 V, I1 = 0.8 V
I0 = 0.8 V, I1 = 2.4 V
I0 = I1 = 0.8 V, No Load
I0 = I1 = 2.4 V, No Load
RT = 56 kΩ, CT = 820 pF
Min.
Limits
Typ. Max.
Units
10
— 45
V
< 1.0
50
μA
— <-1.0 -50 μA
45 — — V
0.4 0.6
V
1.0 1.2
V
1.0 1.2
V
1.3 1.5
V
< 1.0
50
μA
1.6 2.0
V
— 20 25 mA
— 5.0 10 mA
2.4 — — V
— — 0.8 V
— <1.0 20 μA
- 3.0 -200
μA
1.5
— 7.5
V
9.5 10 10.5 —
13.5 15 16.5 —
25.5 30 34.5 —
— 170 — °C
— 40 50 mA
— 10 14 mA
— 46 — μs
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A6219DS 전자부품, 판매, 대치품
L6219DS
Dual Full-Bridge PWM Motor Driverwww.DataSheet4U.com
Application Information
Current Sensing
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 signicant 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 aforementioned 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 1.5 V, for the SENSE terminal, to be
exceeded. The recommended value of RS is in the range of:
RS = 0.75 / ITRIP(max) ± 50% .
If desired, the reference input voltage can be ltered by placing
a capacitor from REFIN to ground. The ground return for this
capacitor as well as the bottom of any resistor divider used should
be independent of the high-current power-ground trace to avoid
changes in REFIN due to IR drops.
Thermal Considerations
For reliable operation, it is recommended that the maximum
junction temperature be kept below 110°C to 125°C. The junction
temperature can be measured best by attaching a thermocouple
to the power pins (6, 7, 18 and 19) of the device and measuring
the pin temperature, TTAB. The junction temperature can then be
approximated by using the formula:
TJ = TTAB + (2 × ILOAD × VF × RθJT) ,
where VF can be chosen from the electrical specication table
for the given level of ILOAD. The value for RθJT is approximately
6°C/W.
The power dissipation can be improved 20% to 30% by adding a
section of printed circuit board copper (typically 6 to 18 square
centimeters) connected to the power pins of the device.
The thermal performance in applications that run at high load
currents, high duty cycles, or both can be improved by adding
external diodes from each output to ground in parallel with the
internal diodes. Fast-recovery (200 ns) diodes should be used to
minimize switching losses.
Load Supply Terminal
The load supply terminal, VBB, should be decoupled with an
electrolytic capacitor (47μF is recommended), placed as close
to the device as is physically practical. To minimize the effect of
system ground IR drops on the logic and reference input signals,
the system ground should have a low-resistance return to the load
supply voltage.
Fixed Off-Time Selection
With increasing values of tOFF, switching losses decrease, low-
level load current regulation improves, EMI reduces, PWM
frequency decreases, and ripple current increases. The value of
tOFF can be chosen for optimization of these parameters. For
applications where audible noise is a concern, typical values of
tOFF should be chosen in the range of 15 to 35 μs.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A6219DS

Dual Full-Bridge PWM Motor Driver

Allegro MicroSystems
Allegro MicroSystems

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