MAX8722EEG Ver la hoja de datos (PDF) - Maxim Integrated
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componentes Descripción
Fabricante
MAX8722EEG Datasheet PDF : 20 Pages
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Low-Cost CCFL Backlight Controller
Typical Operating Characteristics (continued)
(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.3V, TA = +25°C, unless otherwise noted.)
50% BRIGHTNESS DIGITAL
PWM OPERATION (VCNTL = 1V)
MAX8722 toc07
0V A
DIGITAL PWM SOFT-START
MAX8722 toc08
0V A
DIGITAL PWM SOFT-STOP
MAX8722 toc09
0V A
0V B
0V B
0V B
C
0V
D
0V
2ms/div
A: VIFB, 2V/div
B: VVFB, 2V/div
C: VCOMP, 1V/div
D: VDPWM, 5V/div
C
0V
D
0V
40µs/div
A: VIFB, 2V/div
B: VVFB, 2V/div
C: VCOMP, 1V/div
D: VDPWM, 5V/div
C
0V
D
0V
40µs/div
A: VIFB, 2V/div
B: VVFB, 2V/div
C: VCOMP, 1V/div
D: VDPWM, 5V/div
LAMP-OUT VOLTAGE LIMITING
AND TIMEOUT
MAX8722 toc10
A
0V
B
0V
C
0V
200ms/div
A: VIFB, 2V/div
B: VVFB, 2V/div
C: VTFLT, 5V/div
SECONDARY OVERCURRENT
PROTECTION AND TIMEOUT
MAX8722 toc11
A
0V
B
0V
4ms/div
A: VISEC, 500mV/div
B: VTFLT, 2V/div
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
60
57
54
51
48
45
8
12
16
20
24
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 7
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