Typical operating characteristics (continued) – Rainbow Electronics MAX17061 User Manual
Page 8
MAX17061
8-String White LED Driver with
SMBus for LCD Panel Applications
8
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, C
CCV
= 0.022µF, R
CCV
= 5.1k
Ω, V
ISET
= V
OSC
= V
DD
= V
CC
, R
FSET
= 464k
Ω, V
PWMI
= GND, LEDs =
10 series x 4 parallel strings, T
A
= +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
(V
IN
= 7V, BRIGHTNESS = 100%)
MAX17061 toc08
1
μs/div
V
LX
20V/div
I
L
200mA/div
0V
0mA
SWITCHING WAVEFORMS
(V
IN
= 20V, BRIGHTNESS = 100%)
MAX17061 toc09
1
μs/div
V
LX
20V/div
I
L
200mA/div
0V
0mA
STARTUP WAVEFORMS
(BRIGHTNESS = 100%)
MAX17061 toc10
400
μs/div
V
LX
20V/div
I
L
1A/div
V
OUT
20V/div
V
CCV
2V/div
0V
0V
0V
0A
STARTUP WAVEFORMS
(SMBus = 0x04)
MAX17061 toc11
400
μs/div
V
LX
20V/div
I
L
1A/div
V
OUT
20V/div
V
CCV
2V/div
0V
0V
0V
0A
LED CURRENT WAVEFORMS
(SMBus = 0x80)
MAX17061 toc12
2ms/div
V
FB1
10V/div
I
L
500mA/div
I
LED
20mA/div
V
OUT
20V/div
0V
0mA
0mA
0V
LED CURRENT WAVEFORMS
(SMBus = 0x04)
MAX17061 toc13
2ms/div
V
FB1
10V/div
I
L
500mA/div
I
LED
20mA/div
V
OUT
20V/div
0V
0mA
0mA
0V