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參數(shù)資料
| 型號(hào)： | A3979SLP-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | MODULE RABBITCORE RCM3750 |
| 中文描述： | 微步驅(qū)動(dòng)器，帶有翻譯的DMOS |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大小： | 330K |
| 代理商： | A3979SLP-T |
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9
26184.23
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
A3979
DMOS Microstepping Driver with Translator
Synchronous Rectification.
When a PWM off-
cycle is triggered by an internal fixed–off-time cycle, load
current recirculates according to the decay mode selected
by the control logic. The A3979 synchronous rectification
feature turns on the appropriate MOSFETs during the decay
of the current, and effectively shorts out the body diodes
with the low R
DS(On)
driver. This reduces power dissipation
significantly and eliminates the need for external Schottky
diodes for most applications. The synchronous rectification
can be set to either Active mode or Disabled mode:
Active Mode
. When the SR input is logic low, Active
mode is enabled and synchronous rectification can occur.
This mode prevents reversal of the load current by turning
off synchronous rectification when a zero current level is
detected. This prevents the motor winding from conduct-
ing in the reverse direction.
Disabled Mode.
When the SR input is logic high, syn-
chronous rectification is disabled. This mode is typi-
cally used when external diodes are required to transfer
power dissipation from the A3979 package to the external
diodes.
Layout.
The printed circuit board on which the device is
mounted should have a heavy ground plane. For optimum
electrical and thermal performance, the A3979 should be
soldered directly onto the board.
The load supply terminals, VBB
x
, should be decoupled with
an electrolytic capacitor (>47
μ
F is recommended), placed
as close to the device as possible.
To avoid problems due to capacitive coupling of the high
dv
/
dt
switching transients, route the bridge-output traces
away from the sensitive logic-input traces.
Always drive the logic inputs with a low source impedance
to increase noise immunity.
Grounding.
The AGND (analog ground) terminal and the
PGND (power ground) terminal must be connected together
externally.
All ground lines should be connected together and be as
short as possible. A star ground system, centered under the
device, is an optimum design.
The copper ground plane located under the exposed thermal
pad is typically used as the star ground.
Current Sensing.
To minimize inaccuracies caused by
ground-trace IR drops in sensing the output current level,
the current-sense resistors, R
S
x
, should have an independent
ground return to the star ground of the device. This path
should be as short as possible.
For low-value sense resistors, the IR drops in the printed cir-
cuit board sense resistor traces can be significant and should
be taken into account.
The use of sockets should be avoided as they can introduce
variation in R
S
x
due to their contact resistance.
Allegro MicroSystems recommends a value of R
S
given by
R
S
= 0.5/I
TRIP
max
Thermal Protection.
This internal circuitry turns off
all drivers when the junction temperature reaches 165°C,
typical. It is intended only to protect the device from failures
due to excessive junction temperatures and should not imply
that output short circuits are permitted. Thermal shutdown
has a hysteresis of approximately 15°C.
Applications Information
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| A3982 | DMOS Stepper Motor Driver with Translator |
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| A3982SLB-T | DMOS Stepper Motor Driver with Translator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A3979SLP-T | 制造商:Allegro MicroSystems 功能描述:DMOS Driver |
| A3979SLPTR | 功能描述:IC DRIVER MICROSTEPPING 28-TSSOP 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 |
| A3979SLPTR-T | 功能描述:IC DRIVER MICROSTEPPING 28-TSSOP 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:步進(jìn)電機(jī)驅(qū)動(dòng)器，1-2 相，2 相 評(píng)估套件:- 輸出數(shù):1 電流 - 輸出:800mA 電壓 - 負(fù)載:10 V ~ 28 V 電源電壓:4.75 V ~ 5.25 V 工作溫度:-20°C ~ 90°C 安裝類型:表面貼裝 封裝/外殼:28-SOP + 2 翼片裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:28-HSOPHC（15.2x7.9） 包裝:剪切帶 (CT) 其它名稱:869-1268-1 |
| A397A | 制造商:n/a 功能描述:Power Semiconductor |
| A397B | 制造商:Powerex Power Semiconductors 功能描述:DIODE FAST REC 200V 400A |
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