5

FN6570.0

May 9, 2008

Eff_peak

Peak Efficiency

VIN = 18V, 72 LEDs,

20mA each, L = 8.2µH

with DCR 106m

Ω,

91

%

VIN = 12V, 72 LEDs,

20mA each, L = 8.2µH

with DCR 106m

Ω,

90

%

VIN = 6V, 72 LEDs,

20mA each, L = 8.2µH

with DCR 106m

Ω,

86

%

ΔI

Line Regulation

0.1

%

Dmax

Boost Maximum Duty Cycle

82

%

Dmin

Boost Minimum Duty Cycle

7

%

Switching Frequency

1.0

1.2

1.3

MHz

ILX_leakage

LX Leakage Current

VLX = 36V, EN = 0

10

µA

REFERENCE

Imatch

Channel-to-Channel Current Matching

-3.5

±1

+3.5

%

Current Accuracy

±3

%

FAULT DETECTION

VSC

Short Circuit Threshold

PWM Dimming = 100%

7.8

8

8.8

V

Vtemp_acc

Over-Temperature Threshold Accuracy

5

°

C

VOVPlo

Overvoltage Limit on OVP Pin

1.17

1.2

1.23

V

OVPhys

OVP Hysteresis

20

mV

OVPfault

OVP Short Detection Fault Level

300

mV

CURRENT SOURCES

Dominant Channel Current Source

Headroom at IIN Pin

100

mV

Voltage at RSET Pin

680

700

720

mV

ILEDmax

Maximum LED Current Per Channel

35

mA

FAULT PIN

Ifault

Fault Pull-down Current

101830

µA

Vfault

7.5

V

IlxStartup

LX Start-up Current

VDC = 5.2V

1

2.7

7

mA

Electrical Specifications

with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits

established by characterization and are not production tested. (Continued)

PARAMETER

DESCRIPTION

CONDITION

MIN

TYP

MAX

UNIT

ISL97636