Wide brightness range ccfl backlight controllers, Typical operating characteristics (continued) – Rainbow Electronics MAX1839 User Manual
Page 7
MAX1739/MAX1839
†
Wide Brightness Range
CCFL Backlight Controllers
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(V
IN
= 12V, V
CTL
= V
CRF
, V
MINDAC
= 1V, MODE = GND, Circuit of Figure 8.)
20ms/div
STARTUP
(ADC SOFT-START, MODE = GND)
V
CTAP
10V/div
V
BATT
V
CSAV
500mV/div
I
BATT
500mA/div
MAX1739/1839 toc09
12V
0
2ms/div
LAMP-OUT VOLTAGE LIMITING
V
SECONDARY
2kV/div
V
CTAP
5V/div
MAX1739/1839 toc10
1ms/div
SYNCHRONIZED DPWM
(f
MODE
= 100kHz, V
CTL
= V
CRF
/2)
V
CSAV
500mV/div
V
CTAP
5V/div
V
DH
20V/div
MAX1739/1839 toc07
1ms/div
SYNCHRONIZED DPWM
(f
MODE
= 32kHz, V
CTL
= V
CRF
/2)
V
CSAV
500mV/div
V
CTAP
5V/div
V
DH
20V/div
MAX1739/1839 toc06
400ms/div
LAMP-OUT VOLTAGE LIMITING
V
SECONDARY
2kV/div
V
CTAP
5V/div
MAX1739/1839 toc11
0
200
100
500
400
300
800
700
600
900
0
10
5
15
20
25
INPUT CURRENT vs.
INPUT VOLTAGE
MAX1739/1839 toc12
V
BATT
(V)
I
BATT
(mA)
0
2
1
5
4
3
8
7
6
9
SHUTDOWN CURRENT (
µ
A)
SHUTDOWN
MINIMUM BRIGHTNESS
MAXIMUM BRIGHTNESS