MAX8722 datasheet(6/20 Pages) MAXIM

6 / 20 page

Low-Cost CCFL Backlight Controller

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Typical Operating Characteristics

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

LOW INPUT-VOLTAGE

OPERATION (VBATT = 8V)

MAX8722 toc01

10µs/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VLX1, 10V/div

D: VLX2, 10V/div

HIGH INPUT-VOLTAGE

OPERATION (VBATT = 20V)

MAX8722 toc02

10µs/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VLX1, 10V/div

D: VLX2, 10V/div

LINE-TRANSIENT RESPONSE

MAX8722 toc03

20µs/div

0V A

0V B

10V

20V

A: VVFB, 2V/div

B: VIFB, 2V/div

C: VLX1, 10V/div

D: VBATT, 10V/div

LINE-TRANSIENT RESPONSE

MAX8722 toc04

20µs/div

0V A

0V B

10V

20V

A: VVFB, 2V/div

B: VIFB, 2V/div

C: VLX1, 10V/div

D: VBATT, 10V/div

MINIMUM BRIGHTNESS STARTUP

WAVEFORM (VCNTL = 0V)

MAX8722 toc05

2ms/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VCOMP, 1V/div

D: VSHDN, 5V/div

MINIMUM BRIGHTNESS DIGITAL

PWM OPERATION (VCNTL = 0V)

MAX8722 toc06

2ms/div

0V A

0V B

A: VIFB, 2V/div

B: VVFB, 2V/div

C: VCOMP, 1V/div

D: VDPWM, 5V/div

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