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| 型号： | A3980KLP |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER MICROSTEPPING 28-TSSOP |
| 标准包装： | 50 |
| 应用： | 步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ± 1A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 管件 |
A3980
Automotive DMOS Microstepping Driver
with Translator
Functional Description
Device Operation. The A3980 is a complete microstep-
ping motor driver with a built-in translator for easy operation
with minimal control lines. It is designed to operate bipolar
stepper motors in full-, half-, eighth-, and sixteenth-step
modes. The currents in each of the two output full-bridges
and all of the N-channel DMOS FETs are regulated with
? xed off-time PMW (pulse width modulated) control cir-
cuitry. At each step, the current for each full-bridge is set by
the value of its external current-sense resistor (R S1 or R S2 ), a
reference voltage (V REF ), and the output voltage of its DAC
(which in turn is controlled by the output of the translator).
At power-up, the translator resets to the Home state, in which
the motor is driven to the Home microstep position, where
both phase currents are set to +70%. Then the translator sets
the voltage regulator to mixed decay mode for both phases.
When a step command signal occurs on the STEP input, the
translator automatically sequences the DACs to the next
level and current polarity. (See table 3 for the current-level
sequence.) The microstep resolution is set by the combined
effect of inputs MS1 and MS2 , as shown in table 1.
When stepping, if the new output levels of the DACs are
lower than their previous output levels, then the decay mode
(fast, slow, or mixed decay) for the active full-bridge is set
by the PFD input. If the new output levels of the DACs are
higher than or equal to their previous levels, then the decay
mode for the active full-bridge is set to slow decay. This
automatic current decay selection improves microstepping
performance by reducing the distortion of the current wave-
form that results from the back EMF of the motor.
Home Microstep Position. At power-up, or after
a UVLO (undervoltage lockout) condition caused by low
increment. The translator controls the input to the DACs and
the direction of current ? ow in each winding. The size of
the increment is determined by the combined state of inputs
MS1 and MS2.
Microstep Select (MS1 and MS2). Selects the micro-
stepping format, as shown in table 1. Any changes made to
these inputs do not take effect until the next STEP rising edge.
Direction Input (DIR). This determines the direction of
rotation of the motor. When low, the direction will be clock-
wise and when high, counterclockwise. Changes to this input
do not take effect until the next STEP rising edge.
Internal PWM Current Control. Each full-bridge is
controlled by a ? xed off-time PWM current control circuit
that limits the load current to a desired value, I TRIP . Initially,
a diagonal pair of source and sink DMOS FETs are enabled
and current ? ows through the motor winding and the current
sense resistor, R S . When the voltage across R S equals the
DAC output voltage, the current sense comparator resets the
PWM latch. The latch then turns off either the source DMOS
(when in slow decay mode) or the sink and source DMOSs
(when in fast or mixed decay modes).
The transconductance function is approximated by the maxi-
mum value of current limiting, I TripMAX (A), which is set by
I TripMAX = V REF ? (8 ? R S )
where R S is the resistance of the sense resistor ( Ω ) and V REF
is the input voltage on the REF pin (V).
The DAC output reduces the V REF output to the current
sense comparator in precise steps, such that
voltage on V DD , the translator in the A3980 resets the motor
to the Home microstep position. This corresponds to the 45°
I trip = (%I TripMAX ? 100)
× I TripMAX
position, which is the step where both phase currents are
+70%. Referring to table 3, for full-step mode this is step
1, for half-step this is step 2, for eighth-step this is step 5,
and for sixteenth-step this is step 9. In table 3 and ? gures 5
through 8, the Home microstep position is indicated.
Step Input (STEP) . A low-to-high transition on the STEP
input sequences the translator and advances the motor one
(See table 3 for %I TripMAX at each step.)
It is critical that the maximum rating (0.5 V) on the SENSE
pin is not exceeded. For full-step mode, V REF can be applied
up to the maximum rating of V DD , because the peak sense
value is 70% of maximum:
V REF × (0.707 ? 8)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
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| A3980KLP-T | 功能描述:IC MOTOR DRIVER MICROSTEP 28-TSS RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3980KLP-T | 制造商:Allegro MicroSystems 功能描述:Driver IC Package/Case:28-TSSOP |
| A3980KLPTR | 功能描述:IC DRIVER MICROSTEPPING 28-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3980KLPTR-T | 功能描述:IC DRIVER MICROSTEPPING 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| A3981 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive, Programmable Stepper Driver |
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