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| 型号： | A3977SLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/19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
Applications Information
Layout.
The printed wiring board should use a heavy ground
plane.
For optimum electrical and thermal performance, the
driver should be soldered directly onto the board.
The load supply terminal, V BB , should be decoupled
with an electrolytic capacitor (>47 μ F is recommended)
placed as close to the device as possible.
To avoid problems due to capacitive coupling of the
high dv/dt switching transients, route the bridge-output
traces away from the sensitive logic-input traces. Always
drive the logic inputs with a low source impedance to in-
crease noise immunity.
Grounding. A star ground system located close to the
driver is recommended.
The 44-lead PLCC has the analog ground and the
power ground internally bonded to the power tabs of the
package (leads 44, 1, 2, 11 – 13, 22 – 24, and 33 – 35).
On the 28-lead TSSOP package, the analog ground
(lead 7) and the power ground (lead 21) must be con-
nected together externally. The copper ground plane located
under the exposed thermal pad is typically used as the star
ground.
Current Sensing. To minimize inaccuracies caused by
ground-trace IR drops in sensing the output current level,
the current-sense resistor (R S ) should have an independent
ground return to the star ground of the device. This path
should be as short as possible. For low-value sense resis-
tors the IR drops in the printed wiring board sense resistor ’s
traces can be signi ? cant and should be taken into account.
The use of sockets should be avoided as they can introduce
variation in R S due to their contact resistance.
Allegro MicroSystems recommends a value of R S
given by
R S = 0.5/I TRIP max
Thermal Protection. Circuitry turns off all drivers when
the junction temperature reaches 165°C, typically. It is
intended only to protect the device from failures due to
excessive junction temperatures and should not imply that
output short circuits are permitted. Thermal shutdown has a
hysteresis of approximately 15°C.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
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