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A8430 Fiches technique(PDF) 2 Page - Allegro MicroSystems

No de pièce A8430
Description  White LED Driver Constant Current Step-up Converter
Download  10 Pages
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Fabricant  ALLEGRO [Allegro MicroSystems]
Site Internet  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8430 Fiches technique(HTML) 2 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
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Input Voltage Range
VIN
2.5
10
V
Supply Current
ISUP
Active: ILOAD=15mA,
VLOAD=12V
2.5
3.5
mA
Shutdown (EN = 0 V)
0.1
1
µA
Feedback Reference Voltage
VREF
86
95
104
mV
Feedback Input Current
IFB
20
75
nA
Switch Current Limit
ISWLIM
300
mA
Switch Frequency
FSW
0.8
1.2
1.6
MHz
Switch Maximum Duty Cycle
D
85
90
%
Switch Saturation voltage
VCE(SAT)
350
mV
Switch Leakage Current
ISL
––
5
µA
Enable Input
Input Threshold Low
VIL
0.4
V
Input Threshold High
VIH
1.5
V
Input Leakage
Leakage
IIL
––
1
µA
Note 1. Measured with 4-layer PCB. Please refer to application note “Package Thermal Characteristics,“ for thermal perfor-
mance measurement for 3 mm x 3 mm MLP package for additional information.
Functional Block Diagram
VIN
FB
SW
VREF
1.25 V
GND
Driver
A2
S
Ramp
Generator
1.2 MHz
Oscillator
R
C
C
C
A1
95 mV
Enable
EN
Σ
RQ
ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V (unless otherwise noted)


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