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A8430 Fiches technique(PDF) 4 Page - Allegro MicroSystems

No de pièce A8430
Description  White LED Driver Constant Current Step-up Converter
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Fabricant  ALLEGRO [Allegro MicroSystems]
Site Internet  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8430 Fiches technique(HTML) 4 Page - Allegro MicroSystems

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Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
A8430
White LED Driver Constant Current Step-up Converter
Functional Description
Schematic 1. Typical application
A8430
VIN
SW
EN
GND
FB
Li-ion
2.5V to
4.2V
C1
1µF
L1
22µH
D1
C2
0.22µF
R1
6.3
Enable
Typical Application
A typical application circuit for the A8430 is provided in
schematic diagram 1. This illustrates a method of driving
three white LEDs in series. The conversion efficiency of this
configuration is shown in chart 1.
Pin Functions
The diagram also shows a method of connecting the individ-
ual pins, whos functions are described as follows:
VIN. Supply to the control circuit. A bypass capacitor must be
connected from close to this pin to GND.
SW. Low-side switch connection between the inductor (L1)
and ground. Because rapid changes of current occur at this pin,
the traces on the PCB that are connected to this pin should be
minimized. In addition, the inductor (L1) and diode (D1) should
be connected as close to this pin as possible.
EN. Setting lower than 0.4 V disables the A8430 and puts the
control circuit into the low-power Sleep mode. Greater than
1.5 V fully enables the A8430.
GND. Ground reference connected directly to the ground plane.
The sense resistor (R1) should have a separate connection
directly to this point.
FB. Feedback pin for LED current control. The reference
voltage is 95 mV. The top of the sense resistor (R1) is typically
connected to this pin.
Conversion Efficiency versus Input Voltage
70
65
75
80
85
90
95
23456789
10
VIN (V)
3 LEDs
4 LEDs
5 LEDs
Chart 1. Conversion efficiency when driving various
quantities of LEDs in the typical application circuit


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Numéro de composants électroniques

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A8431 White LED Driver Constant Current Step-up Converter 1  2  3  4  5  More Allegro MicroSystems
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MBI5001 8 BIT CONSTANT CURRENT LED DRIVER 1  2  3  4  5  More List of Unclassifed Manufacturers
MBI5169 8 bit CONSTANT CURRENT LED SINK DRIVER WITH ERROR DETECTION 1  2  3  4  5  More List of Unclassifed Manufacturers
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