UC3770B屬于集成電路（IC）的全半橋驅(qū)動器。由美國德州儀器公司制造生產(chǎn)的UC3770B全半橋驅(qū)動器器件屬于電橋驅(qū)動器電源管理集成電路 (PMIC) 系列，包含兩個或多個功率晶體管，以及在外部器件控制下將其用作開關(guān)所需的電路。這些晶體管通常在內(nèi)部配置為成對串聯(lián)連接（稱為半橋），因而任意指定晶體管對之間的結(jié)點都可以連接至兩個電源軌中的任一個。這類器件常用于將控制器件（如微控制器）提供的低電平信號轉(zhuǎn)換為操作執(zhí)行器（如步進電機或無刷電機）所需的較大功率信號。

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.