High-Efficiency, 26V Step-Up Converters for Main
and Subdisplays Using OLEDs and/or White LEDs
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V IN = 3.6V, I LED = 20mA, L1 = 22μH, C OVP = 1μF, C COMP = 0.01μF, R SENSE = 13 ? , V CTRL = 1.5V, 4 LEDs, T A =
+25°C, unless otherwise noted.)
OLED POWER-UP WAVEFORMS
MAX8608Y toc09
OLED SHUTDOWN WAVEFORMS
MAX8608Y toc10
SWITCHING WAVEFORMS
MAX8608Y toc11
OUTB
10V/div
OUTB
10V/div
LX
10V/div
IL
200mV/div
IN
50mV/div
IN
50mV/div IN
50mV/div
ENB
5V/div
ENB
2V/div
OVP
100mV/div
2ms/div
LINE TRANSIENT
MAX8608Y toc12
2ms/div
400ns/div
WLED VCTRL STEP RESPONSE
MAX8608Y toc13
IN
FB_
OVP
500V/div
50mV/div
200mV/div
OUTA
FBA
2V/div
200mV/div
500mV/div
CTRL
OUTB
CTRL
200 μ s/div
OLED VCTRL STEP RESPONSE
MAX8608Y toc14
1ms/div
5V/div
500mV/div
OUTB
I LOAD
200 μ s/div
OLED LOAD TRANSIENT RESPONSE
MAX8608Y toc15
4ms/div
500mV/div
30mA
10mA
_______________________________________________________________________________________
5
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