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| 型号： | A3980KLP-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER MICROSTEP 28-TSS |
| 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 |
| 其它名称： | 620-1081 |
A3980
Automotive DMOS Microstepping Driver
with Translator
Mixed Decay Operation. Depending on the step
sequence, if the voltage on the PFD pin is between
0.6 × V DD and 0.21 × V DD , the full-bridge can operate
in mixed decay mode, as shown in ? gures 5 through 8.
As the trip point is reached, the A3980 goes into fast
decay mode until the voltage on the RC pin decays to
the same level as the voltage applied to the PFD pin. The
duration of time that the bridge operates in fast decay
mode, t FD (ns), is estimated by
t FD = R T × C T × ln[0.6 (V DD ? V PFD )]
over a range of values from C T = 470 pF to 1500 pF and
from R T = 12 k Ω to 100 k Ω .
After this fast decay period, the A3980 switches to slow
decay mode for the remainder of the ? xed off-time
period.
Synchronous Recti ? cation . When a PWM-off
cycle is triggered by an internal ? xed-off-time cycle,
load current recirculates according to the decay mode
selected by the control logic. The synchronous recti ? ca-
tion 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 dissipa-
tion signi ? cantly, and eliminates the need for external
Schottky diodes. Synchronous recti ? cation has two
modes: Active mode and Disabled mode (described below).
Active Mode. When the input on the SR terminal
is set at logic low, Active mode is enabled. This mode
allows synchronous recti ? cation to occur, but when a
zero current level is detected, it also prevents reversal of
the load current by turning off synchronous recti ? cation.
This prevents the motor winding from conducting in the
reverse direction.
Disabled Mode. When the input on the SR terminal
is set at logic high, Disabled mode takes effect. This
mode disables synchronous recti ? cation. This mode
is typically used when external diodes are required to
transfer power dissipation from the A3980 package to
the external diodes.
Shutdown. In the event of an overtemperature fault
or an undervoltage fault on VREG, the DMOS outputs
of the A3980 are disabled until the fault condition is
removed. In the case of an overvoltage fault, the sink
DMOS FETs are switched on, and the source FETs off.
At power-up, and in the event of low V DD , the UVLO
circuit disables the DMOS outputs until V DD reaches the
minimum level. Once V DD is above the minimum level,
the translator resets to the Home state and the DMOS
outputs are re-enabled.
Thermal Protection . All drivers are turned off
when the junction temperature reaches the thermal
shutdown value, typically 170 ? C. This is intended only
to protect the A3980 from failures due to excessive junc-
tion temperatures. Thermal protection will not protect
the A3980 from continuous short circuits, and additional
fault diagnostics are integrated for this purpose. Thermal
shutdown has a hysteresis of approximately 15 ? C.
Diagnostic Features. The A3980 includes moni-
tor circuits that can detect shorts to VBB, shorts to
ground, and shorted or open circuit load. Short circuits
are detected by monitoring the voltage across the driving
DMOS FETs and the open load is detected by monitor-
ing the phase current when the motor is in the Home
microstep position. All fault detection takes place fol-
lowing a delay after the blank time.
Short to VBB. A short from any of the motor connec-
tions to the battery or VBB connection is detected by
monitoring the voltage across the bottom FETs in each
full-bridge. When the FET is on, the voltage should be
no greater than the V DSLT value de ? ned in the Electrical
Characteristics table.
Short to Ground. A short from any of the motor con-
nections to ground is detected by monitoring the voltage
across the top FETs in each full-bridge. When the FET
is turned on, the voltage should be no greater than the
V DSHT value de ? ned in the Electrical Characteristics
table.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A3981_V | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive, Programmable Stepper Driver |
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