MAX8722 datasheet(7/20 Pages) MAXIM

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Low-Cost CCFL Backlight Controller

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50% BRIGHTNESS DIGITAL

PWM OPERATION (VCNTL = 1V)

MAX8722 toc07

2ms/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VCOMP, 1V/div

D: VDPWM, 5V/div

DIGITAL PWM SOFT-START

MAX8722 toc08

40µs/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VCOMP, 1V/div

D: VDPWM, 5V/div

DIGITAL PWM SOFT-STOP

MAX8722 toc09

40µs/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VCOMP, 1V/div

D: VDPWM, 5V/div

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

824

4ms/div

SECONDARY OVERCURRENT

PROTECTION AND TIMEOUT

MAX8722 toc11

A: VISEC, 500mV/div

B: VTFLT, 2V/div

200ms/div

LAMP-OUT VOLTAGE LIMITING

AND TIMEOUT

MAX8722 toc10

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VTFLT, 5V/div

Typical Operating Characteristics (continued)

(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.3V, TA = +25°C, unless otherwise noted.)

MAX8722 Datasheet(PDF) 7 Page - Maxim Integrated Products

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