A5957中文资料Full-Bridge PWM Gate Driver数据手册Allegro规格书

描述 Description

LAST-TIME BUY: This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: July 1, 2019. Deadline for receipt of LAST TIME BUY orders: December 27, 2019.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to A4955 and A4956.

Designed for pulse-width-modulated (PWM) control of DCmotors, the A5957 is capable of 50 V operation and providesgate drive for an all N-channel external MOSFET bridge.

Input terminals are provided for use in controlling the speed anddirection of a DC motor with externally applied PWM controlsignals. Internal synchronous rectification control circuitry isprovided to lower power dissipation during PWM operation.

Internal circuit protection includes VDS protection, thermalshutdown with hysteresis, undervoltage monitoring of VBB,and crossover-current protection.

The A5957 is supplied in a low-profile, 4×4 mm, 20-contactQFN package (suffix “ES”) with exposed thermal pad.

特性 Features

• PHASE/ENABLE/SLEEPn control logic
• Overcurrent indication
• Adjustable off-time and blank-time
• Adjustable current limit
• Adjustable gate drive
• Synchronous rectification
• Internal UVLO
• Crossover-current protection
• MOSFET VDS protection
• Voltage output proportional to load current

简介

A5957属于集成电路（IC）的电机驱动器控制器。由制造生产的A5957电机驱动器，控制器产品属于电机驱动器和控制器电源管理集成电路 (PMIC) 系列，可用于控制或操作从某电源施加到电机或相关机电执行器的电源。所实现的具体功能和特性集根据预期负载和预期应用的特性有很大差异，范围从用于有刷电机的简单开环速度控制到基于步进电机的高级闭环运动控制。