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A3979 PDF预览

A3979

更新时间: 2024-01-17 16:59:35
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器
页数 文件大小 规格书
14页 330K
描述
Microstepping DMOS Driver with Translator

A3979 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:TSSOP
包装说明:HTSSOP, TSSOP28,.25针数:28
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:1.13
模拟集成电路 - 其他类型:STEPPER MOTOR CONTROLLERJESD-30 代码:R-PDSO-G28
JESD-609代码:e3长度:9.7 mm
湿度敏感等级:2功能数量:1
端子数量:28最高工作温度:85 °C
最低工作温度:-20 °C最大输出电流:2.5 A
封装主体材料:PLASTIC/EPOXY封装代码:HTSSOP
封装等效代码:TSSOP28,.25封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):260
电源:3.3/5,35 V认证状态:Not Qualified
座面最大高度:1.2 mm子类别:Motion Control Electronics
最大供电电压 (Vsup):5.5 V最小供电电压 (Vsup):3 V
标称供电电压 (Vsup):5 V表面贴装:YES
技术:NMOS温度等级:OTHER
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:0.65 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:4.4 mm
Base Number Matches:1

A3979 数据手册

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A3979  
Microstepping DMOS Driver with Translator  
The A3979 is a complete microstepping motor driver with built-in  
translator, designed as a pin-compatible replacement for the successful  
A3977, with enhanced microstepping ( /16 step) precision. It is designed  
Package LP, 28-pin TSSOP  
with Exposed Thermal Pad  
1
to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-  
step modes, with an output drive capacity of up to 35 V and ±2.5 A. The  
A3979 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.  
1
2
28  
VBB1  
SENSE1  
HOME  
DIR  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
SLEEP  
ENABLE  
OUT1B  
CP2  
3
4
OUT1A  
PFD  
5
PWM  
Timer  
Charge  
Pump  
6
RC1  
CP1  
Translator  
and  
Control  
Logic  
The translator is the key to the easy implementation of the A3979. It  
allows the simple input of one pulse on the STEP pin to drive the motor  
one microstep, which can be either a full step, half, quarter, or sixteenth,  
depending on the setting of the MS1 and MS2 logic inputs. There are no  
phase-sequence tables, high-frequency control lines, or complex inter-  
faces to program. The A3979 interface is an ideal fit for applications  
where a complex microprocessor is unavailable or is overburdened.  
7
AGND  
REF  
VCP  
8
÷8  
PGND  
VREG  
STEP  
OUT2B  
RESET  
SR  
9
RC2  
Reg  
10  
11  
12  
13  
VDD  
OUT2A  
MS2  
MS1  
SENSE2 14  
VBB2  
Internal synchronous-rectification control circuitry is provided to  
improve power dissipation during PWM operation. Internal circuit  
protection includes: thermal shutdown with hysteresis, UVLO (under-  
voltage lockout), and crossover-current protection. Special power-on  
sequencing is not required.  
AGND and PGND must be  
connected together externally.  
Approximate Scale 1:1  
The A3979 is supplied in a low-profile (maximum height 1.20 mm),  
28-pin TSSOP with exposed thermal pad. The package is available in a  
lead (Pb) free version, with 100% matte tin leadframe plating.  
ABSOLUTE MAXIMUM RATINGS  
Load Supply Voltage,VBB ...................................35 V  
Output Current, IOUT......................................±2.5 A*  
Logic Supply Voltage, VDD ...............................7.0 V  
FEATURES  
Logic Input Voltage Range, V  
IN  
±2.5 A, 35 V output rating  
tW > 30 ns........................–0.3 V to VDD + 0.3 V  
Low RDS(On) outputs: 0.28 Ω source, 0.22 Ω sink, typical  
Automatic current decay mode detection/selection  
3.0 to 5.5 V logic supply voltage range  
Slow, Fast or Mixed current decay modes  
Home output  
Synchronous rectification for low power dissipation  
Internal UVLO and thermal shutdown circuitry  
Crossover-current protection  
tW < 30 ns..............................–1 V to VDD + 1 V  
Sense Voltage, VSENSE .......................................0.5 V  
Reference Voltage, VREF ......................................VDD  
Package Power Dissipation, PD.................See page 5  
Operating Temperature Range  
Ambient, TA, Range S ................... –20°C to 85°C  
Junction Temperature, TJ(MAX).....................150°C  
Storage Temperature, TS .................... –55°C to 150°C  
*Output current rating may be limited by duty cycle,  
ambient temperature, and heat sinking. Under any set of  
conditions, do not exceed the specified current rating or a  
junction temperature of 150°C.  
Use the following complete part number when ordering:  
Part Number  
A3979SLP  
Pb-free  
Ambient, TA (°C)  
–20 to 85  
A3979SLP-T  
Yes  
26184.23  

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