AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
Efficiency vs Load Current
Efficiency vs Load Current
Driving 6 White LEDs
Driving 6 White LEDs
100
90
80
70
60
50
100
VIN=5V
VIN=4V
90
VIN=3.6V
VIN=4V
VIN=5V
VIN=3.3V
VIN=3.6V
80
70
VIN=3.3V
Inductor=47mH
CLEDS=4700pF
Inductor=33mH
CLEDS = 4700pF
60
50
0
5
10
15
20
0
5
10
15
20
Load Current (mA)
Load Current (mA)
Efficiency vs Load Current
Driving 6 White LEDs
LED Current vs Input Voltage
Driving 6 White LEDs
100
90
80
70
60
50
26
23
20
L=47mH
VIN=3.6V
VIN=5V
VIN=3V
VIN=4V
L=22mH
L=33mH
17
14
Inductor=22mH
No Capactor across LEDs
11
2.5
4
4.5
5
5.5
3
3.5
0
5
10
15
20
Input Voltage (V)
Load Current (mA)
LED Current vs CTRL Voltage
LED Current vs. Input Voltage
35
30
25
20
15
10
5
25
22
19
16
13
10
7
L=33mH
L=22mH
L=47mH
4
1
0
3.6
0
0.6
1.2
1.8
2.4
3
2.5
3
3.5
4
4.5
5
5.5
CTRL Voltage (V)
Input Voltage (V)
Rev.C.01
9
AME [ ANALOG MICROELECTRONICS ]
