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A2557ELB-T PDF预览

A2557ELB-T

更新时间: 2024-01-07 23:59:42
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 1519K
描述
PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE

A2557ELB-T 数据手册

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2557  
PROTECTED QUAD LOW-SIDE DRIVER  
WITH FAULT DETECTION and SLEEP MODE  
The A2557xB, A2557xEB, and A2557xLB have been specifically  
A2557xLB (SOIC)  
designed to provide cost-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.  
1
2
3
4
16  
IN  
IN  
OUT  
1
2
1
2
15  
14  
K
ENABLE  
OUT  
Over-current protection for each channel has been designed into these  
devices and is activated at a nominal 500 mA. It protects each output from  
short circuits with supply voltages up to 32 V. 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 short or open load condition is detected, a  
single FAULT output is turned on (active low).  
13  
12  
11  
10  
9
GROUND  
GROUND  
GROUND  
5
6
GROUND  
OUT  
V
3
CC  
7
8
FAULT  
OUT  
IN  
IN  
3
4
4
Continuous or multiple overload conditions causing the channel tempera-  
ture to reach approximately 165°C will result in an additional linear decrease  
in the output current of the affected driver. If the fault condition is corrected,  
the output stage will return to its normal saturated condition.  
Dwg. PP-017-4  
Note that the A2557xB (DIP) and the A2557xLB  
(SOIC) are electrically identical and share a  
common terminal number assignment.  
The packages offer fused leads for enhanced thermal dissipation. Package  
B is 16-pin power DIP with exposed tabs, EB is 28-lead power PLCCs, and  
LB are 16-lead power wide-body SOICs for surface-mount applications. The  
lead (Pb) free versions have 100% matte tin leadframe plating.  
ABSOLUTE MAXIMUM RATINGS  
Output Voltage, VO .............................. 60 V  
Over-Current Protected Output Voltage,  
VO ..................................................... 32 V  
Output Current, IO ......................... 500 mA*  
FAULT Output Voltage, VFLT ............. 60 V  
Logic Supply Voltage, VCC ................. 7.0 V  
Input Voltage, VI or VOE ..................... 7.0 V  
Package Power Dissipation,  
FEATURES  
300 mA Output Current per Channel  
Independent Over-Current Protection &Thermal Limiting for Each Driver  
Output Voltage to 60 V  
PD ........................................... See Graph  
Operating Temperature Range, TA  
Suffix ‘S-’ ...................... -20°C to +85°C  
Suffix ‘E-’ ...................... -40°C to +85°C  
Suffix ‘K-’ ................... -40°C to +125°C  
Junction Temperature,  
TJ ............................................... +150°C*  
Storage Temperature Range,  
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  
TS ................................. -55°C to +150°C  
*Outputs are current limited at approximately  
500 mA per driver and junction temperature  
limited if higher current is attempted.  

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