Rainbow Electronics MAX8709 - Manual (Page 6)

LAMP-OUT VOLTAGE
LIMITING AND TIMEOUT
MAX8709 toc09
A: V
VFB
, 1V/div
B: V IFB , 1V/div
0V
0V
A
B
200ms/div
MAX8709
High-Efficiency CCFL Backlight
Controller with SMBus Interface
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
BATT
= 12V, V
LOT
= V
REF
, V
CC
= V
DD,
V
SUS
= 5.3V, T
A
= +25°C, unless otherwise noted.)
STARTUP
MAX8709 toc04
A: V
SUS
, 5V/div
B: V IFB , 2V/div
C: V VFB , 2V/div
D: V
LX1
, 10V/div
2ms/div
0V
0V
0V
A
B
C
D
0V
DPWM OPERATION (10%)
MAX8709 toc05
A: V CCV , 200mV/div
B: V
IFB
, 1V/div
C: V VFB , 1V/div
1ms/div
0V
0V
1.2V
A
B
C
DPWM OPERATION (50%)
MAX8709 toc06
A: V CCV , 200mV/div
B: V IFB , 1V/div
C: V VFB , 1V/div
1ms/div
0V
0V
1.2V
A
B
C
DPWM SOFT-START
MAX8709 toc07
A: V IFB , 1V/div
B: V VFB , 1V/div
40µs/div
0V
0V
1.2V
A
B
CCI
CCV
DPWM SOFT-STOP
MAX8709 toc08
A: V
IFB
, 1V/div
B: V
VFB
, 1V/div
40µs/div
0V
0V
A
B
CCI
CCV