Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

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3

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

INPUT LEAKAGE

SHDN Leakage Current

SHDN = 26V

+35

µA

CS Leakage Current

+40

+50

µA

OSC Leakage Current

-3

+3

µA

BRT, ENA Leakage Current

-1

+1

µA

FSET, ISET Leakage Current

-1

+1

µA

OV Leakage Current

-0.1

+0.1

µA

LED CURRENT

19.40

20.00

20.60

Ω to GND, BRT = 100%

24.25

25.00

25.75

Full-Scale FB_ Output Current

Ω to GND, BRT = 100%

14.40

15.00

15.60

mA

ISET High-Level Threshold

Default setting for 20mA full-scale LED current

0.4

V

ISET Voltage

1.12

1.19

1.26

V

20% Output Current

3.84

4.00

4.16

mA

-1.5

+1.5

%

Current Regulation Between

Strings

-2.0

+2.0

%

Ω to GND, BRT = 100%

300

500

800

270

450

720

Minimum FB_ Regulation Voltage

150

275

500

mV

Maximum FB_ Ripple

120

200

FB_ On-Resistance

13

20

Ω

1

FB_ Leakage Current

10

28

µA

BRT Input Frequency

100

500

Hz

Minimum BRT Duty Cycle

PLL active

12.5

%

FAULT PROTECTION

OV Threshold Voltage

1.16

1.23

1.30

V

FB_ Overvoltage Threshold

0.20

0.6

1.45

V

FAULT Shutdown Timer

50

65

80

ms

Thermal-Shutdown Threshold

(Note 1)

170

°C

PHASE-LOCKED LOOP

FSET High-Level Threshold

PLL disabled

0.4

V

Ω

150

200

250

BRT Frequency Capture Range

Ω

300

400

500

Hz