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參數(shù)資料
| 型號： | L6219DS-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Dual Full-Bridge PWM Motor Driver |
| 中文描述： | 雙路全橋式PWM馬達驅(qū)動器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 319K |
| 代理商： | L6219DS-T |
Dual Full-Bridge PWM Motor Driver
L6219DS
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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 signi
fi
cant 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 R
S
.
Generally, larger values of R
S
reduce the aforementioned effects
but can result in excessive heating and power loss in the sense
resistor. The selected value of R
S
should not cause the absolute
maximum voltage rating of 1.5 V, for the SENSE terminal, to be
exceeded. The recommended value of R
S
is in the range of:
R
S
= 0.75 /
I
TRIP
(max) ± 50% .
If desired, the reference input voltage can be
fi
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, T
TAB
. The junction temperature can then be
approximated by using the formula:
T
J
=
T
TAB
+ (2
×
I
LOAD
×
V
F
×
R
θ
JT
) ,
where V
F
can be chosen from the electrical speci
fi
cation table
for the given level of I
LOAD
. The value for R
θ
JT
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 (
≥
47
μ
F 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 t
OFF
, switching losses decrease, low-
level load current regulation improves, EMI reduces, PWM
frequency decreases, and ripple current increases. The value of
t
OFF
can be chosen for optimization of these parameters. For
applications where audible noise is a concern, typical values of
t
OFF
should be chosen in the range of 15 to 35
μ
s.
Application Information
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| L6219L-S24-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DUAL FULL-BRIDGE PWM MOTOR DRIVER |
| L6219L-S24-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DUAL FULL-BRIDGE PWM MOTOR DRIVER |
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