a8430 Allegro MicroSystems, Inc., a8430 Datasheet - Page 3

• Manufacturer Part Number: a8430
• Description: White Led Driver Constant Current Step-up Converter
• Manufacturer: Allegro MicroSystems, Inc.

Feedback Bias Current versus Temperature
300
250
200
150
100
2.5
2.0
1.5
1.0
0.5
20
15
10
50
White LED Driver Constant Current Step-up Converter
0
5
0
0
–50
–50
Quiescent Current versus Input Voltage
Switch Pin Voltage versus Temperature
0
2
0
0
Temperature (°C)
Temperature (°C)
4
V
IN
50
50
(V)
6
Using Typical Application Circuit (Schematic 1)
100
100
8
Operating Characteristics
150
150
10
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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
2.15
2.10
2.05
2.00
1.95
1.90
1.25
1.20
1.15
1.10
1.05
1.00
90
85
80
75
70
65
60
Switching Frequency versus Temperature
–50
–50
Quiescent Current versus Temperature
Conversion Efficiency versus Current
0
0
0
5
Temperature (°C)
Temperature (°C)
LED Current (mA)
50
50
10
V
V
100
100
15
IN
IN
= 3 V
= 4 V
A8430
150
150
20
3