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| MAX1561 Datasheet, PDF (5/10 Pages) Maxim Integrated Products – High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs | |||
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High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 3.6V, ILED = 15mA, L1 = 22µH, CIN = 2.2µF, COUT = 0.1µF, CCOMP = 0.1µF, RSENSE = 7.5â¦, 4 LEDs,
TA = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
MAX1561 toc10
VIN
10mV/div
VOUT
100mV/div
VLX
10V/div
500ns/div
SOFT-START AND SHUTDOWN
MAX1561 toc11
VCTRL
1V/div
0V
VIN
50mV/div
IIN
50mA/div
0mA
VOUT
5V/div
VIN = 3.8V Li+ BATTERY
0V
20ms/div
CTRL STEP RESPONSE
MAX1561 toc12
VCTRL
1V/div
0V
VIN
50mV/div
IIN
50mA/div
0mA
VOUT
5V/div
VIN = 3.8V Li+ BATTERY
0V
20ms/div
DIRECT-PWM DIMMING
MAX1561 toc13
VCTRL
32kHz
1V/div
0V
VIN
50mV/div
IIN
50mA/div
0mA
VOUT
5V/div
VIN = 3.8V Li+ BATTERY
0V
50µs/div
LINE-TRANSIENT RESPONSE
MAX1561 toc14
4V
VIN
500mV/div
3.5V
50µs/div
IIN
50mA/div
0mA
VCS
100mV/div
0V
_______________________________________________________________________________________ 5
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