Rainbow-electronics MAX754 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX753/MAX754

CCFL Backlight and

LCD Contrast Controllers

_______________________________________________________________________________________ 3

Note 1: Maximum shutdown current occurs at BATT = LX = 0V.

Note 2: Timing specifications are guaranteed by design and not production tested.

ELECTRICAL CHARACTERISTICS (continued)

= 5V, BATT = 15V, CON = LON = 5V, LX = GND = PGND = 0V, I

REF

= 0mA, all digital input levels are 0V or 5V,

= T

MIN

to T

MAX

, unless otherwise noted.)

At zero scale (code = 0)

At full scale (DAC code = 31)

At full scale (DAC code = 63)

Guaranteed monotonic

BATT = 4V, LX = 0V

BATT = 16V

Sink current, CFB = 5V, CC = 2.5V

Source current, CFB = 0V, CC = 2.5V

At zero scale (code = 0)

BATT = 4V

CONDITIONS

µA12 20LX Input Current

µA12 20BATT Input Current

nA±150LFB Input Leakage Current

595 625 655

893 928 963

1200 1240 1280

MAX753 Feedback Voltage (REF-LFB)

Bits6DAC Resolution

µs35 70Switching Period

0.5 1.5

µs

Switch On-Time

745 782 820

1210 1250 1290

Feedback Voltage (CFB)

200

µA

Feedback-Amplifier Output Current

V/µs0.4Feedback-Amplifier Slew Rate

320 343 365

nA±100Feedback-Amplifier Input Bias Current

MHz1Feedback-Amplifier Unity-Gain Bandwidth

UNITSMIN TYP MAXPARAMETER

At preset DAC, CON = 0V, CADJ = 5V

(code = 15)

ns100CADJ, LADJ High Width (t

)

ns0Reset Hold Time (t

)

ns0Reset Setup Time (t

)

ns110Reset Pulse Width (t

)

At preset DAC, LON = 0V, LADJ = 5V

(code = 31)

LON = CON = CS = LFB = CFB = LADJ =

CADJ = LX = 0V

LON = CON = CS = LFB = CFB = LADJ =

CADJ = 0V, LX = BATT = 15V

ns100CADJ, LADJ Low Width (t

)

ns50

CADJ Low to CON Low or

LADJ Low to LON Low (t

)

At zero scale (code = 0)

At preset DAC, LON = 0V, LADJ = 5V

(code = 31)

At full scale (DAC code = 63)

610 635 660

905 938 971

1210 1250 1290

MAX754 Feedback Voltage (LFB)

LCD CONTROLLER

TIMING (Note 2)

1 2 3 4 5 6 7 8 ... 15 16

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