UC3770A集成电路（IC）的全半桥驱动器规格书PDF中文资料

UC3770A属于集成电路（IC）的全半桥驱动器。由美国德州仪器公司制造生产的UC3770A全半桥驱动器器件属于电桥驱动器电源管理集成电路 (PMIC) 系列，包含两个或多个功率晶体管，以及在外部器件控制下将其用作开关所需的电路。这些晶体管通常在内部配置为成对串联连接（称为半桥），因而任意指定晶体管对之间的结点都可以连接至两个电源轨中的任一个。这类器件常用于将控制器件（如微控制器）提供的低电平信号转换为操作执行器（如步进电机或无刷电机）所需的较大功率信号。

FEATURES

• Full-Step, Half-Step and Micro-Step

Capability.

• Bipolar Output Current up to 2A.

• Wide Range of Motor Supply Voltage:

10–50V

• Low Saturation Voltage

• Wide Range of Current Control: 5mA–2A.

• Current Levels Selected in Steps or Varied

Continuously.

• Thermal Protection and Soft Intervention.

DESCRIPTION

The UC3770A and UC3770B are high-performance full bridge drivers

that offer higher current and lower saturation voltage than the

UC3717 and the UC3770. Included in these devices are LS-TTL

compatible logic inputs, current sense, monostable, thermal shutdown,

and a power H-bridge output stage. Two UC3770As or

UC3770Bs and a few external components form a complete microprocessor-

controllable stepper motor power system.

Unlike the UC3717, the UC3770A and the UC3770B require external

high-side clamp diodes. The UC3770A and UC3770B are

identical in all regards except for the current sense thresholds.

Thresholds for the UC3770A are identical to those of the older

UC3717 permitting drop-in replacement in applications where

high-side diodes are not required. Thresholds for the UC3770B are

tailored for half stepping applications where 50%, 71%, and 100%

current levels are desirable.

The UC3770A and UC3770B are specified for operation from 0°C

to 70°C ambient.