High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
Typical Operating Characteristics (continued)
(MAX1553 driving six white LEDs, V CC = V EN = 3.6V, Circuit of Figure 1, T A = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
(CONTINUOUS OPERATION,
3.75V Li+ BATTERY, 18mA OUTPUT)
MAX1553/54 toc10
SWITCHING WAVEFORMS
(DISCONTINUOUS OPERATION,
3.75V Li+ BATTERY, 10mA OUTPUT)
MAX1553/54 toc11
V LX
V OUT
I L
V EN
V FB
V OUT
2 μ s/div
L1 = 47 μ H, 4700pF CAPACITOR ACROSS LEDs
STARTUP/SHUTDOWN WAVEFORMS
MAX1553/54 toc12
40ms/div
L1 = 22 μ H
10V/div
200mV/div
200mA/div
5V/div
200mV/div
10V/div
V LX
V OUT
I L
V BRT
V FB
V OUT
2 μ s/div
L1 = 47 μ H, 4700pF CAPACITOR ACROSS LEDs
BRT STEP RESPONSE
MAX1553/54 toc13
20ms/div
L1 = 22 μ H,
10V/div
200mV/div
200mA/div
1V/div
200mV/div
2V/div
V BRT = 0.5V TO 1.25V TO O.5V
_______________________________________________________________________________________
5
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