Wide brightness range ccfl backlight controllers, Typical operating characteristics – Rainbow Electronics MAX1839 User Manual
Page 6
MAX1739/MAX1839
†
Wide Brightness Range
CCFL Backlight Controllers
6
_______________________________________________________________________________________
Typical Operating Characteristics
(V
IN
= 12V, V
CTL
= V
CRF
, V
MINDAC
= 1V, MODE = GND, Circuit of Figure 8.)
4
µs/div
WIDE INPUT RANGE
(V
BATT
= 8V)
V
CSAV
500mV/div
V
CTAP
5V/div
V
DH
20V/div
MAX1739/1839 toc01
4
µs/div
WIDE INPUT RANGE
(V
BATT
= 20V)
V
CSAV
500mV/div
V
CTAP
5V/div
V
DH
20V/div
MAX1739/1839 toc02
100
µs/div
V
CCI
V
CCI
V
CCI
V
CCV
V
CCV
V
CCV
WIDE INPUT RANGE
(V
BATT
= 8V, DPWM = 9%, V
CTL
= 0)
V
CSAV
500mV/div
V
CTAP
10V/div
V
CCV,
V
CCI
200mV/div
1.2V
MAX1739/1839 toc03
100
µs/div
V
CCI
V
CCI
V
CCI
V
CCV
V
CCV
V
CCV
WIDE INPUT RANGE
(V
BATT
= 20V, DPWM = 9%, V
CTL
= 0)
V
CSAV
500mV/div
V
CTAP
10V/div
V
CCV
,
V
CCI
200mV/div
1.2V
MAX1739/1839 toc04
20
µs/div
FEED-FORWARD COMPENSATION
V
CTAP
5mV/div
V
IN
20V
10V
V
CSAV
500mV/div
V
DH
20V/div
MAX1739/1839 toc05
4
µs/div
SWITCHING WAVEFORMS
V
CSAV
500mV/div
V
CTAP
10V/div
V
DH
20V/div
V
DL
5V/div
MAX1739/1839 toc08