MAX8709B Просмотр технического описания (PDF) - Maxim Integrated

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MAX8709B

High-Efficiency CCFL Backlight Controller with SMBus Interface

Maxim Integrated 

High-Efficiency CCFL Backlight

Controller with SMBus Interface

Typical Operating Characteristics (continued)

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

STARTUP

MAX8709 toc04

A

0V

0V B

0V C

A: VSUS, 5V/div

B: VIFB, 2V/div

C: VVFB, 2V/div

D: VLX1, 10V/div

2ms/div

D

0V

DPWM OPERATION (10%)

MAX8709 toc05

A

1.2V

0V B

DPWM OPERATION (50%)

MAX8709 toc06

A

1.2V

0V B

1ms/div

A: VCCV, 200mV/div

B: VIFB, 1V/div

C: VVFB, 1V/div

0V C

1ms/div

A: VCCV, 200mV/div

B: VIFB, 1V/div

C: VVFB, 1V/div

0V C

DPWM SOFT-START

MAX8709 toc07

CCI

CCV

1.2V

0V A

A: VIFB, 1V/div

B: VVFB, 1V/div

40μs/div

0V B

DPWM SOFT-STOP

MAX8709 toc08

CCI

CCV

0V A

LAMP-OUT VOLTAGE

LIMITING AND TIMEOUT

MAX8709 toc09

0V A

A: VIFB, 1V/div

B: VVFB, 1V/div

40μs/div

0V B

A: VVFB, 1V/div

B: VIFB, 1V/div

200ms/div

0V B

6 _______________________________________________________________________________________

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