AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
Switching Waveforms
Switching Waveforms
10V/div
VSW
VSW
10V/div
VOUT
200VOUT
VOUT
IL
200mA/div
200mV/div
IL
200VOUT
2ms/div
2ms/div
Discontinuous Operation,
Continuous Operation,
3.75V Li+Battery, 10mA Output
3.75V Li+Battery, 18mA Output
L=47mH, CLEDS=4700 pF
L=47mH, CLEDS=4700 pF
CTRL Step Respone
Starup/Shutdown Waveforms
5V/div
VEN
VCTRL
1V/div
VFB
200mV/div
20V/div
VFB
200mV/div
VOUT
10V/div
VOUT
20ms/div
L=22mH
40ms/div
L=22mH
VCTRL=0.5V to 1.25V to 0.5V
LED Current vs CTRL Duty Cycle
OVP Waveforms
30
25
20
OVP
15
10
5
10V/div
0
0
20
40
60
80
100
20ms/div
CTRL Duty Cycle (%)
Rev.C.01
10
AME [ ANALOG MICROELECTRONICS ]
