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參數(shù)資料
| 型號： | A3982SLB-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | DMOS Stepper Motor Driver with Translator |
| 中文描述： | 步進(jìn)電機(jī)驅(qū)動器的DMOS與翻譯 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 299K |
| 代理商： | A3982SLB-T |
7
26184.28B
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
A3982
DMOS Stepper Motor Driver with Translator
is determined by the selection of an external resistor con-
nected from the ROSC timing pin to ground. If the ROSC
pin is tied to an external voltage > 3 V, then t
OFF
defaults to
30
μ
s. The ROSC pin can be safely connected to the VDD
pin for this purpose. The value of t
OFF
(
μ
s) is approximately
t
OFF
≈
R
OSC
825
Blanking.
This function blanks the output of the current
sense comparators when the outputs are switched by the
internal current control circuitry. The comparator outputs
are blanked to prevent false overcurrent detection due to
reverse recovery currents of the clamp diodes, and switching
transients related to the capacitance of the load. The blank
time, t
BLANK
(
μ
s), is approximately
t
BLANK
≈
1
μ
s
Charge Pump
(CP1 and CP2).
The charge pump is
used to generate a gate supply greater than that of VBB
for driving the source-side DMOS gates. A 0.1
μ
F ceramic
capacitor, should be connected between CP1 and CP2. In
addition, a 0.1
μ
F ceramic capacitor is required between
VCP and VBB, to act as a reservoir for operating the
high-side DMOS gates.
VREG
(VREG)
.
This internally-generated voltage is
used to operate the sink-side DMOS outputs. The VREG
pin must be decoupled with a 0.22
μ
F ceramic capacitor to
ground. VREG is internally monitored. In the case of a fault
condition, the DMOS outputs of the A3982 are disabled.
Enable Input
(ENABLE)
.
This input turns on or off all
of the DMOS outputs. When set to a logic high, the outputs
are disabled. When set to a logic low, the internal control
enables the outputs as required. The translator inputs STEP,
DIR, and MS1, as well as the internal sequencing logic, all
remain active, independent of the ENABLE input state.
Shutdown.
In the event of a fault, overtemperature
(excess T
J
) or an undervoltage (on VCP), the DMOS out-
puts of the A3982 are disabled until the fault condition is
removed. At power-on, the UVLO (undervoltage lockout)
circuit disables the DMOS outputs and resets the translator
to the Home state.
Mixed Decay Operation.
The bridge can operate in
Mixed Decay Mode, depending on the step sequence, as
shown in figures 3 thru 5. As the trip point is reached, the
A3982 initially goes into a fast decay mode for 31.25%
of the off-time, t
OFF
. After that, it switches to Slow Decay
Mode for the remainder of t
OFF
.
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. This synchronous rectification feature turns on
the appropriate FETs during current decay, and effectively
shorts out the body diodes with the low DMOS R
DSON
. This
reduces power dissipation significantly, and can eliminate
the need for external Schottky diodes in many applications.
Turning off synchronous rectification prevents the reversal of
the load current when a zero-current level is detected.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A3982SLB-T | 制造商:Allegro MicroSystems 功能描述:Motor Driver IC |
| A3982SLBTR | 功能描述:IC MOTOR DRIVER STEPPER 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動器，步進(jìn)電機(jī)驅(qū)動器 評估套件:- 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 |
| A3982SLBTR-T | 功能描述:IC MOTOR DRIVER STEPPER 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:步進(jìn)電機(jī)驅(qū)動器，1-2 相，2 相 評估套件:- 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 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 |
| A3983 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator |
| A3983_08 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator |
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