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A8518KLPTR-T-1 PDF预览

A8518KLPTR-T-1

更新时间: 2024-10-29 01:08:31
品牌 Logo 应用领域
急速微 - ALLEGRO /
页数 文件大小 规格书
30页 1458K
描述
Fully integrated 42 V MOSFET for boost converter

A8518KLPTR-T-1 数据手册

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Wide Input Voltage Range, High-Efficiency,  
Fault-Tolerant LED Driver  
A8518 and A8518-1  
CHARACTERISTIC PERFORMANCE  
Startup Waveforms  
Efficiency Measurement  
Efficiency at 120 mA/Channel for various LED configurations  
89.00  
VOUT  
88.00  
87.00  
10X2 LED  
86.00  
85.00  
84.00  
83.00  
82.00  
81.00  
80.00  
VSW  
Eff(%  
)
9X2 LED  
8X2 LED  
7X2 LED  
8
10  
12  
14  
16  
ILED(TOTAL)  
VIN (V)  
Vn
A8518 Evaluation Board Efficiency versus Input Voltage while  
Disconnect Switch and Snubber Circuit are Used  
Efficiency at VIN = 12 V for various LED configurations  
Start up at 100% PWM Dimming, VIN = 7 V, 2 Channels,  
10 LEDs/Channels, 120 mA/Channels; Time base = 10 ms/Div  
90.00  
88.00  
9X2 LED  
86.00  
84.00  
82.00  
80.00  
78.00  
Eff(%)  
VOUT  
8X2 LED  
7X2 LED  
VSW  
0.1  
0.2  
0.3  
0.4  
Total LED Current (A)  
A8518 Evaluation Board Efficiency versus Total LED Current while  
Disconnect Switch and Snubber Circuit are Used  
ILED(TOTAL)  
Higher efficiency can be achieved by:  
• Using an inductor with a low DCR.  
• Using lower forward voltage drop and a smaller juction  
capacitance Schottky diode.  
Start up at 0.02% PWM Dimming at 200 Hz, VIN = 7 V, 2 Channels,  
10 LEDs/Channel, 120 mA/Channel; Time base = 10 ms/Div  
• Removal of snubber circuit; however, this might compromise  
the EMI performance.  
• Shorting out the disconnect switch and the input current sense  
resistor; however, this will eliminate the output short-to-GND  
protection feature.  
Allegro MicroSystems, LLC  
115 Northeast Cutoff  
10  
Worcester, Massachusetts 01615-0036 U.S.A.  
1.508.853.5000; www.allegromicro.com  

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