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IS31LT3948-GRLS4-TR PDF预览

IS31LT3948-GRLS4-TR

更新时间： 2024-11-11 14:51:39
品牌 Logo 应用领域
美国芯成 - ISSI 驱动光电二极管接口集成电路
页数 文件大小 规格书
18页 454K
描述
LED Driver

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中文翻译

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IS31LT3948-GRLS4-TR 技术参数

是否Rohs认证： 符合生命周期：Active
包装说明：LSOP,Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
Factory Lead Time：6 weeks风险等级：1.7
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：R-PDSO-G8
长度：4.9 mm功能数量：1
区段数：1端子数量：8
最高工作温度：125 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：LSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, LOW PROFILE
峰值回流温度（摄氏度）：NOT SPECIFIED座面最大高度：1.7 mm
最大供电电压：100 V最小供电电压：5 V
标称供电电压：10 V表面贴装：YES
温度等级：AUTOMOTIVE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：NOT SPECIFIED宽度：3.94 mm
Base Number Matches：1

IS31LT3948-GRLS4-TR 数据手册

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IS31LT3948  
PFM MODE BOOST LED DRIVER WITH THE EXTERNAL NMOS  
February 2015  
GENERAL DESCRIPTION  
FEATURES  
The IS31LT3948 is a PFM step-up DC-DC converter  
designed for driving the white LED arrays for large  
size LCD panel backlighting applications. It can  
deliver stable constant output current from a few  
milliamps up to 2A, programmed via an external  
resistor.  
Wide input voltage range: 5V~100V  
Constant current output limited only by external  
component selection (Note)  
No loop compensation required  
Internal over-voltage protection  
Internal over-temperature protection  
Operating temperature range -40C to +85C  
(IS31LT3948-GRLS2-TR)  
Operating temperature range -40C to +125C  
(IS31LT3948-GRLS4-TR)  
The IS31LT3948 utilizes a control scheme in which  
the output is automatically adjusted to the optimum  
output voltage for the system, maximizing the  
efficiency. Furthermore, the control scheme is  
inherently stable removing the need to provide  
additional loop compensation.  
SOP-8 package  
Note: The maximum output current is determined by  
OUT/VIN ratio as well as the external components. If  
output current and VOUT/VIN ratio is high, high current  
components of inductor and NMOS are needed.  
The device features external PWM dimming, which  
allows the flexible control of the back-lighting  
luminance.  
V
The IS31LT3948 has a wide input voltage range  
from 5V to 100V (Note). An integrated OVP circuit  
protects the chip and the system even under no-load  
conditions.  
APPLICATIONS  
TV monitor backlighting  
Notebook  
Automotive  
Street lamp  
LED lighting  
The chip is assembled in SOP-8 package. It  
operates from 5V to 100V over two temperature  
ranges of -40°C to +85°C and -40°C to +125°C.  
Note: The IS31LT3948 has an internal 5V shunt  
regulator connected to the VCC pin. A dropping  
resistor must be connected between the VCC pin  
and VIN to limit current flow. VIN voltages above  
100V are allowed but care must be taken to ensure  
that the output voltage remains greater than VIN,  
and that the NMOS voltage rating is sufficiently  
large.  
TYPICAL APPLICATION CIRCUIT  
Figure 1 Typical Application Circuit  
Integrated Silicon Solution, Inc. – www.issi.com  
Rev. D, 01/21/2015  
1
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