MAX8722 Maxim Integrated Products, MAX8722 Datasheet - Page 7

• Manufacturer Part Number: MAX8722
• Description: Low-Cost CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

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(Circuit of Figure 1. V
A: V
B: V
C: V
IFB
VFB
TFLT
PWM OPERATION (V
LAMP-OUT VOLTAGE LIMITING
A: V
B: V
, 2V/div
, 2V/div
50% BRIGHTNESS DIGITAL
, 5V/div
IFB
VFB
, 2V/div
, 2V/div
AND TIMEOUT
200ms/div
2ms/div
_______________________________________________________________________________________
BATT
C: V
D: V
CNTL
COMP
DPWM
= 12V, V
= 1V)
, 1V/div
, 5V/div
MAX8722 toc07
MAX8722 toc10
Low-Cost CCFL Backlight Controller
CC
0V A
0V B
0V
0V
0V
0V
0V
C
D
A
B
C
= V
DD,
V
SHDN
A: V
B: V
Typical Operating Characteristics (continued)
ISEC
TFLT
A: V
B: V
SECONDARY OVERCURRENT
PROTECTION AND TIMEOUT
DIGITAL PWM SOFT-START
, 500mV/div
, 2V/div
= 5.3V, T
IFB
VFB
, 2V/div
, 2V/div
40µs/div
4ms/div
A
= +25°C, unless otherwise noted.)
C: V
D: V
COMP
DPWM
, 1V/div
, 5V/div
MAX8722 toc08
MAX8722 toc11
0V A
0V B
0V
0V
0V
0V
A
B
C
D
60
57
54
51
48
45
8
A: V
B: V
DIGITAL PWM SOFT-STOP
SWITCHING FREQUENCY
IFB
VFB
12
vs. INPUT VOLTAGE
, 2V/div
, 2V/div
INPUT VOLTAGE (V)
40µs/div
16
C: V
D: V
COMP
DPWM
20
, 1V/div
, 5V/div
MAX8722 toc09
24
0V A
0V B
0V
0V
C
D
7