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A8181E5R PDF预览

A8181E5R

更新时间: 2024-10-31 01:15:59
品牌 Logo 应用领域
创瑞 - AITSEMI 驱动
页数 文件大小 规格书
20页 502K
描述
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH

A8181E5R 数据手册

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A8181  
AiT Semiconductor Inc.  
www.ait-ic.com  
36V, 1.2A LED STEP-DOWN  
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH  
DESCRIPTION  
FEATURES  
Simple low parts count  
Internal 36V NDMOS switch  
Up to 1.2A output current  
Single pin on/off and brightness control using  
DC voltage or PWM  
Soft Start  
High efficiency (up to 97%)  
Wide input voltage range: 6V to 36V  
Output shutdown  
Up to 1MHz switching frequency  
Inherent open-circuit LED protection  
Typical 3% output current accuracy  
High-side current sense  
Hysteretic control: no compensation  
Adjustable constant LED current  
Over temperature protection  
Available in SOT-25 package  
The A8181 is a continuous mode inductive step-down  
converter, designed for driving single or multiple  
series connected LEDs efficiently from a voltage  
source higher than the LED voltage. The device  
operates from an input supply between 6V and 36V  
and provides an externally output current up to 1.2A.  
Depending upon supply voltage and external  
components, this can provides up to 24 watts of  
output power.  
The A8181 includes the output switch and a high-side  
output current sensing circuit, which uses an external  
resistor to set the nominal average output current.  
APPLICATIONS  
Output current can be adjusted by applying an  
external control signal to the 'ADJ' pin. The ADJ pin  
will accept either a DC voltage or a PWM waveform.  
During DC dimming, this will provide a continuous  
output current that is proportional to the external  
applied DC voltage. During the PWM dimming, this  
will provide a gated output current and the average  
current is proportional to the duty cycle. Applying a  
voltage of 0.2V or lower to the ADJ pin turns the  
output off and switches the device into a low current  
standby state.  
Low voltage halogen replacement LEDs  
Automotive lighting  
Low voltage industrial lighting  
LED back-up lighting  
Illuminated signs  
LCD TV backlighting  
TYPICAL APPLICATION  
The A8181 is available in SOT-25 Packages.  
ORDERING INFORMATION  
Package Type  
SOT-25  
Part Number  
A8181E5R  
A8181E5VR  
E5  
V: Green Package  
R : Tape & Reel  
Note  
AiT provides all Pb free products  
Suffix ꢀ V ꢀ means Green Package  
REV1.0  
- APR 2011 RELEASED -  
- 1 -  

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