Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

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5

Note 1: Specifications are guaranteed by design, not production tested.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

LED CURRENT

19.2

20.8

Ω to GND, BRT = 100%

24.0

26.0

Full-Scale FB_ Output Current

Ω to GND, BRT = 100%

14.4

15.6

mA

ISET High-Level Threshold

Default setting for 20mA full-scale LED current

0.4

V

ISET Voltage

1.12

1.26

V

20% Output Current

3.8

4.2

mA

-2

+2

Current Regulation Between

Strings

-3

+3

%

Ω to GND, BRT = 100%

280

840

250

760

Minimum FB_ Regulation Voltage

140

530

mV

Maximum FB_ Ripple

200

FB_ On-Resistance

20

Ω

1

FB_ Leakage Current

28

µA

BRT Input Frequency

100

500

Hz

FAULT PROTECTION

OV Threshold Voltage

1.16

1.30

V

FB_ Overvoltage Threshold

0.2

1.45

V

FAULT Shutdown Timer

50

80

ms

PHASE-LOCKED LOOP

FSET High-Level Threshold

PLL disabled

0.4

V

Ω

150

250

Hz

BRT Frequency Capture Range

Ω

300

500

Hz