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參數(shù)資料
| 型號： | A8904SLP-T |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.4 A, PDSO28 |
| 封裝： | 1.20 MM HEIGHT, LEAD FREE, TSSOP-28 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 736K |
| 代理商： | A8904SLP-T |
3-Phase Brushless DC Motor Controller/Driver
with Back EMF Sensing
A8904
12
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A speed error signal is created by integrating the differences
between the TACH and REF signal. If the TACH signal goes low
before the REF signal then an ERROR FAST is produced and if
the TACH signal goes low after the REF signal then an ERROR
SLOW is produced. The error signal generated enables the ap-
propriate current source (see diagram next page) to either charge
or discharge the lter components on the FILTER terminal.
The FILTER voltage is then used to provide linear cur-
rent control in the windings via the transconductance stage (see
diagram next page). The output current is sensed through an
internal sense resistor, RS. The voltage across the sense resistor
is compared to the lowest of either one-tenth of the voltage at
the FILTER terminal, minus the lter threshold voltage, or to the
maximum current limit reference.
Alternatively, external control of the FILTER terminal can
be introduced by disabling the frequency-lock loop circuitry
(D24 = 1).
The transconductance function is dened as:
IOUT = (VFILTER – VFILTERTH) / (10 x RS x G)
where RS is nominally 200 mΩ,
VFILTERTH is approximately 1.85 V,
G = 1, when D28 = 0 and gain = 500 mA/V or
G = 2, when D28 = 1 and gain = 250 mA/V.
The closed loop control response of the overall system is
shaped via the lter components that are introduced at the FIL-
TER terminal.
Clamping the current to a level dened by the serial port
(D3 & D4) provides output current limit protection. This feature
is particularly useful where high transient currents are experi-
enced, e.g., during start-up. Once normal running conditions are
reached, the current limit can be appropriately reduced. Note that
the current limit is scaled according to the gm value selected.
Sector mode.
An external tachometer signal, such as sec-
tor or index pulses, can be used to create the TACH signal, rather
than the internally generated once-around scheme. The external
signal is applied to the SECTOR DATA terminal and the serial
port bit (D19 = 1) must be programmed to enable this feature.
Functional Description (cont’d)
Speed error signals
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| A8904SLPTR-T | 功能描述:IC CTRLR/DRVR DC MOTOR 28TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電機和風(fēng)扇控制器，驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機驅(qū)動器，步進電機驅(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 |
| A8905CLB | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING |
| A8906CLB | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:BIDIRECTIONAL 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING |
| A8909CLB | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING AND POWER DMOS OUTPUTS |
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