Wide Brightness Range

CCFL Backlight Controllers

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5

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SUPPLY AND REFERENCE

4.6

5.5

VL = open

6

28

V

SH/SUS = SH = GND

20

µA

VL Output Voltage, Normal Operation

5.0

5.6

V

VL rising (leaving lockout)

4.6

VL Undervoltage Lockout Threshold

VL falling (entering lockout)

4.0

V

REF Output Voltage, Normal

Operation

1.95

2.05

V

VL POR Threshold

0.9

2.7

V

SWITCHING REGULATOR

DH Driver On-Resistance

18

Ω

DL1, DL2 Driver On-Resistance

18

Ω

SYNC Synchronization Range

Detect falling edges on SYNC

64

200

kHz

CS Overcurrent Threshold

408

492

mV

DAC AND ERROR AMPLIFIER

CSAV Regulation Point

186

202

mV

CTFB Regulation Point

560

640

mV

CTFB to CCV Transconductance

30

50

µmho

ANALOG INTERFACE BRIGHTNESS CONTROL (MODE connected to REF or MODE connected to GND)

SH Input Low Voltage

0.8

V

SH Input High Voltage

2.1

V

SYSTEM MANAGEMENT BUS BRIGHTNESS CONTROL (MODE connected to VL)

CRF/SDA, CTL/SCL, SH/SUS Input

Low Voltage

0.8

V

CRF/SDA, CTL/SCL, SH/SUS Input

High Voltage

2.1

V

CRF/SDA Output Low Sink Current

4

mA

Note 1: Corresponds to 512 DPWM cycles or 65536 MODE

cycles.

Note 3: Corresponds to 64 DPWM cycles or 8192 MODE cycles.

Note 4: The MODE pin thresholds are only valid while the part is

differentiates between SMB mode and ADC mode. In

shutdown with ADC mode selected, the CRF/SDA and

CTL/SCL pins are at high impedance and will not cause

extra supply current when their voltages are not at

GND or VL.

MODE

500pF

10k

Note 5: The amplitude is measured with the following circuit:

Note 6: Specifications from -40°C to +85°C are guaranteed by

design, not production tested.