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參數(shù)資料
| 型號(hào)： | 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(dá)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 319K |
| 代理商： | L6219DS-T |
Dual Full-Bridge PWM Motor Driver
L6219DS
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Applications Information
PWM Current Control
The L6219DS dual bridge is designed to drive both windings of
a bipolar stepper motor. Output current is sensed and controlled
independently in each bridge by an external sense resistor (R
S
),
internal comparator, and monostable multivibrator.
When the bridge is turned on, current increases in the motor
winding and it is sensed by the external sense resistor until
the sense voltage (V
COMPIN
) reaches the level set at the
comparator’s input:
I
TRIP
= V
REF
/10 R
S
The comparator then triggers the monostable which turns off
the source driver of the bridge. The actual load current peak
will be slightly higher than the trip point (especially for low-
inductance loads) because of the internal logic and switching
delays. This delay (t
d
) is typically 2
μ
s. After turn-off, the
motor current decays, circulating through the ground-clamp
diode and sink transistor. The source driver’s off time (and
therefore the magnitude of the current decrease) is determined
by the monostable’s external RC timing components, where
t
off
= R
T
C
T
within the range of 20 k
Ω
to 100 k
Ω
and 100 pF to
1000 pF.
The
fi
xed-off time should be short enough to keep the current
chopping above the audible range (< 46
μ
s) and long enough to
properly regulate the current. Because only slow-decay current
control is available, short off times (< 10
μ
s) require additional
efforts to ensure proper current regulation. Factors that can
negatively affect the ability to properly regulate the current
when using short off times include: higher motor-supply
voltage, light load, and longer than necessary blank time.
When the source driver is re-enabled, the winding current (the
sense voltage) is again allowed to rise to the comparator’s
threshold. This cycle repeats itself, maintaining the average
motor winding current at the desired level.
Loads with high distributed capacitances may result in high
turn-on current peaks. This peak (appearing across R
S
) will
attempt to trip the comparator, resulting in erroneous current
control or high-frequency oscillations. An external R
C
C
C
time delay should be used to further delay the action of the
comparator. Depending on load type, many applications will
not require these external components (SENSE connected to
COMP IN).
+
–
0
Dwg. WM-003-1A
V
PHASE
I
OUT
t
d
t
off
I
Dwg. EP-006-1
RS
BB
V
BRIDGE ON
SOURCE OFF
ALL OFF
PWM Output Current Wave Form
Load Current Paths
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| L6219DSTR | 功能描述:IC MOTOR DRVR PWM DUAL 24SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動(dòng)器，步進(jìn)電機(jī)驅(qū)動(dòng)器 評(píng)估套件:- 輸出數(shù):1 或 2 電流 - 輸出:750mA 電壓 - 負(fù)載:10 V ~ 40 V 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-BFSOP（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOP 包裝:Digi-Reel® 其它名稱:MTS62C19A-HS105DKR |
| L6219DSTR-T | 功能描述:IC MOTOR DRIVER PWM DUAL 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動(dòng)器，步進(jìn)電機(jī)驅(qū)動(dòng)器 評(píng)估套件:- 輸出數(shù):1 或 2 電流 - 輸出:750mA 電壓 - 負(fù)載:10 V ~ 40 V 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-BFSOP（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOP 包裝:Digi-Reel® 其它名稱:MTS62C19A-HS105DKR |
| 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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