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| 型号： | A3977SLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR PWM DUAL 28TSSOP |
| 标准包装： | 1 |
| 应用： | 步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±2.5A |
| 电压 - 负载： | 8 V ~ 35 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°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： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1147-6 |
A3977
Microstepping DMOS Driver with Translator
Functional Description (cont’d)
Synchronous Recti ? cation. When a PWM off-cycle is
triggered by an internal ? xed off-time cycle, load current
will recirculate according to the decay mode selected by
the control logic. The A3977 synchronous recti ? cation fea-
ture will turn on the appropriate MOSFETs during the cur-
rent decay and effectively short out the body diodes with
the low r DS(on) driver. This will reduce power dissipation
signi ? cantly and eliminate the need for external Schottky
diodes for most applications.
The synchronous recti ? cation can be set in either ac-
tive mode or disabled mode.
Active Mode. When the SR input is logic low, active
mode is enabled and synchronous recti ? cation will occur.
This mode prevents reversal of the load current by turning
off synchronous recti ? cation 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 recti ? cation is disabled. This mode is typically
used when external diodes are required to transfer power
dissipation from the A3977 package to the external diodes.
Timing Requirements
(T A = +25°C, V DD = 5 V, Logic Levels are V DD and Ground)
A. Minimum Command Active Time
Before Step Pulse (Data Set-Up Time) ..... 200 ns
B. Minimum Command Active Time
After Step Pulse (Data Hold Time) ........... 200 ns
C. Minimum STEP Pulse Width ...................... 1.0 μ s
D. Minimum STEP Low Time ......................... 1.0 μ s
E. Maximum Wake-Up Time ......................... 1.0 ms
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
9
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