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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 33/44页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR MICRO STEP 28TSSOP |
| 特色产品： | A4979 Series |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 评估套件： | 可供 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°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 |
| 其它名称： | 620-1463-6 |
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A4979
Layout
Traces
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
together externally. The copper ground plane located under the
exposed thermal pad is typically used as the star ground point.
R S =
PCBThe printed circuit board (PCB, or printed wiring board)
should use a higher weight copper thickness than a standard small
signal or digital circuit board. This helps to reduce the impedance
of the printed traces when conducting high currents. PCB traces
carrying switching currents should be as wide and short as pos-
sible to reduce the inductance of the trace. This will help reduce
any voltage transients caused by current switching during PWM
current control.
For optimum thermal performance, the exposed thermal pad on
the underside of the A4979 should be soldered directly onto the
board. A solid ground plane should be added to the opposite side
of the board, and multiple vias through the board to the ground
plane should be placed in the area under the thermal pad.
Decoupling
All supplies should be decoupled with an electrolytic capacitor in
parallel with a ceramic capacitor. The ceramic capacitor should
have a value of 100 nF and should be placed as close as pos-
sible to the associated supply and ground pins of the A4979. The
electrolytic capacitor connected to VBB should be rated at least
Current Sense Resistor
In sensing the output current level, to minimize inaccuracies
caused by ground-trace IR drops, the current sense resistor (R S )
should have an independent ground return to the star ground
point. This path should be as short as possible. For low-value
sense resistors, the IR drop in the PCB trace to the sense resis-
tor can be significant and should be taken into account. Surface
mount chip resistors are recommended to minimize contact
resistance and parasitic inductance. The value, R S , of the sense
resistor is given by:
V REF
16 × I SMAX
There is no restriction on the value of R S or V REF , other than the
range of V REF over which the output current precision is guaran-
teed. However, it is recommended that the value of V REF be kept
as high as possible to improve the current accuracy. The table
below provides increasing values of I SMAX for suggested values
of V REF and standard E96 values of R S .
Suggested Values
1.5 times the maximum circuit voltage, and selected to support
the maximum ripple current provided to the motor. The value of
the capacitor is unimportant but should be the lowest value with
the necessary ripple current capability.
The pump capacitor between CP1 and CP2, the pump storage
capacitor between VCP and VBB, and the compensation capaci-
tor between VREG and ground should be connected as close as
possible to the respective pins of the A4979.
Grounding
A star ground system, with the common star point located close to
the A4979, is recommended. The reference ground, AGND (pin
7), and the power ground, PGND (pin 21), must be connected
I SMAX
(mA)
100
200
300
405
501
610
702
812
912
1008
R S
(m Ω )
499
499
417
309
249
205
178
154
137
124
V REF
(V)
0.8
1.6
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
33
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