Typical operating characteristics (continued) – Rainbow Electronics MAX17061 User Manual
Page 9
MAX17061
8-String White LED Driver with
SMBus for LCD Panel Applications
_______________________________________________________________________________________
9
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.)
LED-OPEN FAULT PROTECTION
(BRIGHTNESS = 100%, LED OPEN ON FB1)
MAX17061 toc14
400
μs/div
V
FB1
1V/div
I
FB2
20mA/div
I
FB2
10V/div
V
OUT
20V/div
0V
0V
0V
0mA
LED-SHORT FAULT PROTECTION
(BRT = 100%, 2 LEDs SHORT ON FB1)
MAX17061 toc15
1ms/div
V
FB1
5V/div
V
FB2
10V/div
I
FB2
20mA/div
I
FB1
20mA/div
0V
0V
0mA
0mA
LINE TRANSIENT RESPONSE
(V
IN
= 12V
→19V, BRIGHTNESS = 100%)
MAX17061 toc16
100
μs/div
V
OUT
20V/div
I
L
1A/div
I
FB1
20mA/div
V
IN
10V/div
0V
0V
0A
0mA
LINE TRANSIENT RESPONSE
(V
IN
= 19V
→12V, BRIGHTNESS = 100%)
MAX17061 toc17
100
μs/div
V
OUT
20V/div
I
L
1A/div
I
FB1
20mA/div
V
IN
10V/div
0V
0V
0A
0mA
LED CURRENT BALANCE
vs. INPUT VOLTAGE
MAX17061 toc18
LED CURRENT BALANCE (%)
17
20
14
11
8
-0.2
0.2
0.6
1.0
-1.0
-0.6
5
INPUT VOLTAGE (V)