Datasheet > A2557_09

A2557_09

更新时间： 2022-05-21 13:44:38

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
12页	306K
描述
Protected Quad Driver with Fault Detection and Sleep Mode

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A2557_09 数据手册

A2557

Protected Quad Driver

with Fault Detection and Sleep Mode

Features and Benefits

▪ 300 mA output current per channel

Description

The A2557 has been specifically designed to provide cost-

▪ Independent overcurrent protection and thermal limiting

for each driver

▪ Output voltage to 60 V

effective solutions to relay-driving applications with up to

300 mA drive current per channel. They may also be used for

driving incandescent lamps in applications where turn-on time

is not a concern. Each of the four outputs will sink 300 mA in

the on state. The outputs have a minimum breakdown voltage

of 60 V and a sustaining voltage of 40 V. A low-power Sleep

Mode is activated with either ENABLE low or all inputs low.

In this mode, the supply current drops to below 100 μA.

▪ Output SOA protection

▪ Fault-detection circuitry for open or shorted load

▪ Low quiescent current Sleep Mode

▪ Integral output flyback/clamp diodes

▪ TTL- and 5 V CMOS-compatible inputs

Overcurrentprotectionforeachchannelhasbeendesignedinto

these devices and is activated at a nominal 500 mA. It protects

eachoutputfromshortcircuitswithsupplyvoltagesupto32V.

When an output experiences a short circuit, the output current

is limited at the 500 mA current clamp. In addition, foldback

circuitry decreases the current limit if an excessive voltage

is present across the output and assists in keeping the device

within its SOA (safe operating area). An exclusive-OR circuit

compares the input and output state of each driver. If either a

shortoropenloadconditionisdetected,asingleFAULToutput

is turned on (active low).

Packages:

Package EB, 28-pin PLCC

with internally fused pins

Package B, 16-pin DIP

with exposed tabs

Continued on the next page…

Package LB, 16-pin SOIC

with internally fused pins

Not to scale

Functional Block Diagram

FAULT

ENABLE

SLEEP

CONTROL

COMMON CONTROL

ONE OF FOUR DRIVERS

2.5 V

–

OUT

CURRENT

LIMIT

THERMAL

LIMIT

<<1

29317.16L

12 3 4 5 6 7...12

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与A2557_09相关器件

型号	品牌	描述	获取价格	数据表
A2557EB	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION & SLEEP MODE	获取价格
A2557EB-T	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE	获取价格
A2557EEB	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION & SLEEP MODE	获取价格
A2557EEB-T	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE	获取价格
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