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