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參數(shù)資料
| 型號(hào)： | A8431EEH-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | White LED Driver Constant Current Step-up Converter |
| 中文描述： | 白光LED驅(qū)動(dòng)恒流升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 331K |
| 代理商： | A8431EEH-T |
4
26185.301
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
A8431
White LED Driver Constant Current Step-up Converter
Functional Description
Schematic 1. Typical application
A8431
1
2
3
5
6
4
VIN
SW
OVP
EN
GND
FB
Li-ion
2.5V to
4.2V
C1
1.0 μF
L1
22 μH
D1
C2
0.22 μF
R1
6.3
Enable
Typical Application
A typical application circuit for the A8431 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, C1, 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, L1 and the diode D1 should be
connected as close to this pin as possible.
OVP.
Overvoltage Protection sense pin to protect the A8431
from excessive voltage on the SW pin. This pin should be
connected to the output capacitor, C2. To disable this feature
connect the pin to ground.
EN.
Setting lower than 0.4 V disables the A8431 and puts the
control circuit into the low-power Sleep mode. Greater than
1.5 V fully enables the A8431.
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 R1 is typically connected here.
60
65
70
75
80
85
90
0
5
10
15
20
LED Current (mA)
E
V
IN
= 3 V
V
IN
= 4 V
Conversion Efficiency versus Current
Chart 1. Conversion efficiency when driving three LEDs
in the typical application circuit.
Preliminary Data Sheet
Subject to Change Without Notice
December 7, 2004
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