Typical operating characteristics (continued) – Rainbow Electronics MAX17127 User Manual
Page 7
_______________________________________________________________________________________ 7
MAX17127
Six-String WLED Driver with Integrated
Step-Up Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
IN
= 12V, T
A
= +25NC, unless otherwise noted.)
SWITCHING WAVEFORMS
(V
S
= 26V, BRIGHTNESS = 100%)
MAX17127 toc09
1µs/div
V
LX
20V/div
0mA
200mA/div
INDUCTOR
CURRENT
0V
V
OUT
= 32V, I
OUT
= 120mA
STARTUP WAVEFORMS
(BRIGHTNESS = 100%)
MAX17127 toc10
1ms/div
V
LX
20V/div
V
OUT
20V/div
V
EN
5V/div
0V
INDUCTOR
CURRENT
500mA/div
0A
0V
0V
12V
STARTUP WAVEFORMS
(BRIGHTNESS = 20%)
MAX17127 toc11
2ms/div
V
LX
20V/div
V
OUT
20V/div
V
EN
5V/div
0V
INDUCTOR
CURRENT
500mA/div
0A
0V
0V
12V
LED CURRENT WAVEFORMS
(BRIGHTNESS = 50%)
MAX17127 toc12
1ms/div
V
FB1
10V/div
0V
INDUCTOR
CURRENT
500mA/div
0mA
I
LED
20mA/div
0mA
LED CURRENT WAVEFORMS
(BRIGHTNESS = 1%)
MAX17127 toc13
1ms/div
V
FB1
10V/div
0V
INDUCTOR
CURRENT
500mA/div
0mA
I
FB1
20mA/div
0mA
LED-OPEN FAULT PROTECTION
(BRIGHTNESS = 100%, LED OPEN ON FB1)
MAX17127 toc14
200ms/div
V
OUT
10V/div
V
FB1
1V/div
0V
V
FB2
10V/div
0V
I
FB2
10mA/div
10V
20mA
0mA
32V