UC3717A集成电路（IC）的全半桥驱动器规格书PDF中文资料

UC3717A属于集成电路（IC）的全半桥驱动器。由德州仪器制造生产的UC3717A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 1A

· Wide Range of Motor Supply Voltage

10-46V

· Low Saturation Voltage with Integrated

Bootstrap

· Built-In Fast Recovery Commutating

Diodes

· Current Levels Selected in Steps or Varied

Continuously

· Thermal Protection with Soft Intervention

DESCRIPTION

The UC3717A is an improved version of the UC3717, used to switch

drive the current in one winding of a bipolar stepper motor. The

UC3717A has been modified to supply higher winding current, more

reliable thermal protection, and improved efficiency by providing integrated

bootstrap circuitry to lower recirculation saturation voltages.

The diagram shown below presents the building blocks of the

UC3717A. Included are an LS-TTL compatible logic input, a current

sensor, a monostable, a thermal shutdown network, and an H-bridge

output stage. The output stage features built-in fast recovery commutating

diodes and integrated bootstrap pull up. Two UC3717As

and a few external components form a complete control and drive

unit for LS-TTL or micro-processor controlled stepper motor systems.

The UC3717A is characterized for operation over the temperature

range of 0°C to +70°C.