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A8521KLPTR-T PDF预览

A8521KLPTR-T

更新时间: 2024-01-23 23:37:50
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器
页数 文件大小 规格书
35页 1284K
描述
The A8521 is a multi-output white LED driver for small-size LCD backlighting.

A8521KLPTR-T 数据手册

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Wide Input Voltage Range, High Efficiency  
Fault Tolerant LED Driver  
A8521  
Description (continued)  
TheA8521 is provided in a 20-pin TSSOP package (suffix LP) with  
an exposed pad for enhanced thermal dissipation. It is lead (Pb) free,  
with 100% matte tin lead frame plating.  
Selection Guide  
Part Number  
Packing*  
A8521KLPTR-T  
4000 pieces per 13-in. reel  
®
*Contact Allegro for additional packing options  
Absolute Maximum Ratings*  
Characteristic  
Symbol  
Notes  
Rating  
Unit  
V
LEDx Pins  
OVP Pin  
–0.3 to 55  
–0.3 to 60  
V
VSENSE and GATE pins should not exceed VIN  
by more than 0.4 V  
VIN, VSENSE, GATE Pins  
SW Pin  
–0.3 to 40  
V
Continuous  
t < 50 ns  
–0.6 to 62  
–1.0  
V
V
¯¯¯¯¯¯¯¯¯  
FAULT Pin  
-0.3 to 40  
–0.3 to 5.5  
–0.3 to 7  
–40 to 125  
150  
V
ISET, FSET, APWM, COMP Pins  
All Other Pins  
V
V
Operating Ambient Temperature  
Maximum Junction Temperature  
Storage Temperature  
TA  
TJ(max)  
Tstg  
Range K  
ºC  
ºC  
ºC  
–55 to 150  
*Stresses beyond those listed in this table may cause permanent damage to the device. The Absolute Maximum ratings are  
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the Electrical  
Characteristics table is not implied. Exposure to Absolute Maximum-rated conditions for extended periods may affect device reliability.  
Table of Contents  
Specifications  
Pin-out Diagram and Terminal List  
2
3
Overvoltage protection  
Boost switch overcurrent protection  
Input overcurrent protection and  
disconnect switch  
Setting the current sense resistor  
Input UVLO  
VDD  
Shutdown  
Fault protection during operation  
19  
21  
Characteristic Performance  
8
22  
23  
23  
23  
23  
24  
Functional Description  
Enabling the IC  
11  
11  
11  
13  
13  
14  
15  
15  
16  
18  
Powering up: LED pin short-to-ground check  
Soft start function  
Frequency selection  
Sync  
LED current setting and LED dimming  
PWM dimming  
APWM pin  
Application Information  
26  
26  
30  
34  
Design Example for Boost Configuration  
Design Example for SEPIC Configuration  
Package Outline Drawing  
Analog dimming  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff  
2
Worcester, Massachusetts 01615-0036 U.S.A.  
1.508.853.5000; www.allegromicro.com  

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