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A8519KETTR-R Arkusz danych(PDF) 10 Page - Allegro MicroSystems

Numer części A8519KETTR-R
Szczegółowy opis  Fully integrated 42 V MOSFET for boost converter
PDF  35 Pages
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Producent  ALLEGRO [Allegro MicroSystems]
Strona internetowa  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8519KETTR-R Arkusz danych(HTML) 10 Page - Allegro MicroSystems

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Wide Input Voltage Range, High-Efficiency,
Fault-Tolerant LED Driver
A8519 and
A8519-1
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
CHARACTERISTIC PERFORMANCE
8
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
10
12
14
16
10 × 4 LED
9 × 4 LED
8 × 4 LED
7 × 4 LED
Eff
%
Efficiency at 60 mA/Channel for Various LED Configurations
V(V)
IN
Efficiency Measurement
A8519 Evaluation Board Efficiency versus Input Voltage while
Disconnect Switch and Snubber Circuit are Used
0.1
78.00
80.00
82.00
84.00
86.00
88.00
90.00
92.00
0.2
0.3
0.4
10 × 4 LED
9 × 4 LED
8 × 4 LED
7 × 4 LED
Eff
%
Efficiency at V= 12 V for Various LED Configurations
IN
Total LED Current (A)
A8519 Evaluation Board Efficiency versus Total LED Current while
Disconnect Switch and Snubber Circuit are Used
Startup Waveforms
Start up at 100% PWM Dimming, VIN = 7 V, 4 Channels,
10 LEDs/Channel, 60 mA/Channel; Time base = 10 ms/Div
Start up at 0.02% PWM Dimming, VIN = 7 V, 4 Channels,
10 LEDs/Channel, 60 mA/Channel; Time base = 10 ms/Div
Higher efficiency can be achieved by:
• Using an inductor with low DCR.
• Using lower forward voltage drop and smaller junction
capacitance Schottky diode.
• Removing the 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.
• Lowering switching frequency. This will significantly improve
the efficiency; however, to avoid the EMI AM band limits,
careful switching frequency selection is required. In addition,
a larger inductor will be needed.
VOUT
VSW
ILED(TOTAL)
VOUT
VSW
ILED(TOTAL)



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