A2557KEB

更新时间： 2024-01-18 18:10:40

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	177K
描述
PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION & SLEEP MODE

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A2557KEB 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	LEAD FREE, MS-013AA, SOIC-16
针数：	16	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.82	Is Samacsys：	N
内置保护：	TRANSIENT; OVER CURRENT; THERMAL	驱动器位数：	4
接口集成电路类型：	AND GATE BASED PERIPHERAL DRIVER	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e3	长度：	10.3 mm
湿度敏感等级：	3	功能数量：	4
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-20 °C	输出电流流向：	SINK
最大输出电流：	0.3 A	标称输出峰值电流：	0.5 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP16,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	2.65 mm	子类别：	Peripheral Drivers
最大供电电压：	5.25 V	最小供电电压：	4.75 V
标称供电电压：	5 V	表面贴装：	YES
技术：	BIPOLAR	温度等级：	OTHER
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	断开时间：	10 µs
接通时间：	10 µs	宽度：	7.5 mm
Base Number Matches：	1

A2557KEB 数据手册

2557

PROTECTED QUAD DRIVER

WITH FAULT DETECTION

& SLEEP MODE

CIRCUIT DESCRIPTION AND APPLICATION (continued)

Fault diagnostics

NORMAL LAMP IN-RUSH CURRENT

A pull-up resistor or current source is required on the

FAULT output. This can be connected to whatever supply level

the following circuitry requires (within the specification

constraints). For a 5 V supply (i.e., Vcc) 150 kΩ or greater

should be used. As the fault diagnostic function is to indicate

when the output state is different from the input state for any

channel, the FAULT output waveform will obviously produce a

pulse waveform following the combined duty-cycle of all

channels showing a fault condition. There are therefore two

basic approaches to using the function in an application:

NOT TO SCALE

•

As an interrupt in a controller-based system. If the system

THERMAL GRADIENT SENSING

has a microcontroller then a FAULT low causes an interrupt,

which then initiates a diagnostic sequence to find the culprit

channel. This sequence usually consists of cycling through

each channel one at a time, while monitoring the FAULT

output. It is then easy to determine which channel has the

faulty output and how it is failing (i.e., short to supply, open-

circuit or short to ground). The system may then take whatever

action is required, but could continue with operation of the

remaining ‘good’ channels while disabling signals to the faulty

channel.

CURRENT LIMIT

TRIP

TIME

Dwg. WP-008

Inductive load driver

Bifilar (unipolar) stepper motors (and other inductive

loads) can be driven directly. The internal diodes prevent

damage to the output transistors by suppressing the high-voltage

spikes that occur when turning off an inductive load. For rapid

current decay (fast turn-off speeds), the use of Zener diodes will

raise the flyback voltage and improve performance. However,

the peak voltage must not exceed the specified minimum

sustaining voltage (V_SUPPLY+ V_Z+ V_F< V_O(SUS)).

•

As a simple ‘common’ fault indication. If there is no

controller in the system then the FAULT output can be set to

give an indication (via a lamp or LED, etc.) of a fault condition

which might be anywhere on the four channels. Because the

FAULT output is dependent on the states of the input and

output (four possibilities) but will only indicate on two of them,

the duty cycle at the FAULT output will reflect the duty cycle at

the faulty channel’s input (or its inverse, depending upon fault

type).

Over-current conditions

In the event of a shorted load, or stalled motor, the load

current will attempt to increase. As described above, the drive

current to the affected output stage is linearly reduced, causing

the output to go linear (limiting the load current to about 500

mA). As the junction temperature of the output stage increases,

the thermal-shutdown circuit will shut off the affected output.

If the fault condition is corrected, the output driver will return

to its normal saturated condition.

In typical applications (50% duty cycles) a simple solution

is to make the pull-up current on the FAULT output much less

than the pull-down current (60 µA), and add a capacitor to give

a time constant longer than the period of operation. For typical

values, the device will produce a continuous dc output level.

Component values will need to be adjusted to cope with

different conditions.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

1...3 4 567 8 9...12

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与A2557KEB相关器件

型号	品牌	描述	获取价格	数据表
A2557KEB-T	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE	获取价格
A2557KEBTR	ALLEGRO	暂无描述	获取价格
A2557KLB	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION & SLEEP MODE	获取价格
A2557KLB-T	ALLEGRO	PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE	获取价格
A2557KLBTR	ALLEGRO	暂无描述	获取价格
A2557KLBTR-T	ALLEGRO	暂无描述	获取价格

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