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| 型号： | A3977SLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/19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
Features and Benefits
? ±2.5 A, 35 V output rating
? Low r DS(on) outputs, 0.45 Ω source, 0.36 Ω sink typical
? Automatic current decay mode detection/selection
? 3.0 to 5.5 V logic supply voltage range
? Mixed, fast, and slow current decay modes
? Home output
? Synchronous rectification for low power dissipation
? Internal UVLO and thermal shutdown circuitry
? Crossover-current protection
Packages:
Package ED, 44-pin PLCC
with internally fused pins
Package LP, 28-pin TSSOP
with exposed thermal pad
Not to scale
Description
The A3977 is a complete microstepping motor driver, with built-
in translator. It is designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive
capability of 35 V and ±2.5 A. The A3977 includes a fixed
off-time current regulator that has the ability to operate in
slow-, fast-, or mixed-decay modes. This current-decay control
scheme results in reduced audible motor noise, increased step
accuracy, and reduced power dissipation.
The translator is the key to the easy implementation of the
A3977. Simply inputting one pulse on the STEP input drives the
motor one step (two logic inputs determine if it is a full-, half-,
quarter-, or eighth-step). There are no phase-sequence tables,
high-frequency control lines, or complex interfaces to program.
The A3977 interface is an ideal fit for applications where a
complex microprocessor is unavailable or over-burdened.
Internal synchronous-rectification control circuitry is provided
to improve power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage lockout (UVLO) and crossover-current
protection. Special power-up sequencing is not required.
The A3977 is supplied in a choice of two power packages, a
44-pin plastic PLCC with 3 internally-fused pins on each of
four sides (suffix ED), and a thin (<1.2 mm), 28-pin TSSOP
with an exposed thermal pad (suffix LP). Both packages are
lead (Pb) free, with 100% matte tin leadframe plating.
Pin-out Diagram
6
5
4
3
2
1
44
43
42
41
40
V BB1
NC
NC
7
8
39 NC
38 CP 2
PFD
9
PWM
TIMER
37 CP 1
RC 1 10
GND 11
GND 12
GND 13
36 V CP
35 GND
34 GND
33 GND
REF 14
÷8
REG
32
V REG
RC 2 15
31 STEP
LOGIC
SUPPLY
16
V DD
30 NC
NC 17
V BB2
29 NC
18
19
20
21
22
23
24
25
26
27
28
Dwg. PP-075-1
26184.22K
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A3977XED | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microstepping DMOS Driver with Translator |
| A3977XLP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microstepping DMOS Driver with Translator |
| A3979 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Microstepping DMOS Driver with Translator |
| A3979_08 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Microstepping DMOS Driver with Translator |
| A3979_13 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Microstepping DMOS Driver with Translator |
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