MAX1995ETI datasheet(6/31 Pages) MAXIM

Part #	MAX1995ETI

Description	High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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High-Efficiency, Wide Brightness

Range, CCFL Backlight Controllers

6

_______________________________________________________________________________________

10

5

0

20

15

25

VCC vs. VBATT

VBATT (V)

1

2

3

0

5

6

4

NORMAL OPERATION

SHUTDOWN

1ms/div

STARTUP

0V

12V

VBATT

VFB

2V/div

IFB

2V/div

MAX1895 toc04

IBATT

500mA/div

1ms/div

SYNCHRONIZED DPWM

(fMODE = 100kHz, DPWM = 50%)

VFB

1V/div

IFB

1V/div

LX1

10V/div

LX2

10V/div

MAX1895 toc05

1ms/div

SYNCHRONIZED DPWM

(fMODE = 32kHz, DPWM = 50%)

VFB

1V/div

IFB

1V/div

LX1

10V/div

LX2

10V/div

MAX1895 toc06

2ms/div

LAMP-OUT VOLTAGE LIMITING

VFB

2V/div

VSECONDARY

2kV/div

IFB

1V/div

MAX1895 toc07

LAMP REMOVED

400ms/div

LAMP-OUT PROTECTION

VSECONDARY

2kV/div

VFB

2V/div

IFB

1V/div

MAX1895 toc08

2s

LAMP REMOVED

Typical Operating Characteristics

(VBATT = 12V, VCTL = VCRF, VMINDAC = 1V, MODE = GND, circuit of Figure 1, Table 4.)

10

µs/div

LOW INPUT VOLTAGE OPERATION

(VBATT = 8V)

IFB

2V/div

VFB

2V/div

LX1

10V/div

LX2

10V/div

MAX1895 toc01

10

µs/div

HIGH INPUT VOLTAGE OPERATION

(VBATT = 20V)

IFB

2V/div

VFB

2V/div

LX1

10V/div

LX2

10V/div

MAX1895 toc02

20

µs/div

FEED-FORWARD COMPENSATION

10V

VBATT

20V

VFB

2V/div

IFB

2V/div

MAX1895 toc03

LX1

10V/div

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