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ISL97678IRZ

8-Channel 45V 50mA LED Driver

Intersil 

ISL97678

Electrical Specifications

All specifications below are characterized at TA = -40°C to +85°C; VIN = 12V, /SHUT = 5V,

ISET = 36kΩ, unless otherwise noted. Boldface limits apply over the operating

temperature range, -40°C to +85°C. (Continued)

PARAMETER

DESCRIPTION

CONDITION

MIN

MAX

(Note 7) TYP (Note 7) UNIT

Eff_peak

Peak Efficiency

DMAX

DMIN

fSW

ILX_leakage

Boost Maximum Duty Cycle

Boost Minimum Duty Cycle

Boost Switching Frequency

Lx Leakage Current

VIN = 24V, 96LEDs,

20mA each, L = 10µH

with DCR ≤100mΩ,

FSW = 600kHz,

TA = +25°C

VIN = 12V, 96 LEDs,

20mA each, L = 10µH

with DCR ≤100mΩ,

FSW = 600kHz,

TA = +25°C

VIN = 6V, 96 LEDs,

20mA each, L = 10µH

with DCR ≤100mΩ,

FSW = 600kHz,

TA = +25°C

VIN = 24V, 80 LEDs,

40mA each, L = 10µH

with DCR ≤100mΩ,

FSW=600kHz,

TA = +25°C

VIN = 12V, 80 LEDs,

40mA each, L = 10µH

with DCR ≤100mΩ,

FSW = 600kHz,

TA = +25°C

fSW = 500kHz

fSW = 500kHz

Rfsw = 100kΩ

Rfsw = 33kΩ

VLX = 45V, /SHUT = 0V

90

0.45

1.35

92.4

91.5

81.6

93.4

90.7

0.5

1.5

10

0.55

1.65

10

%

%

%

%

%

%

%

MHz

MHz

µA

REFERENCE

IMATCH

IACC

Channel-to-Channel Current Matching

Absolute Current Accuracy

FAULT DETECTION

ILED = 20mA

IRSET = 36kΩ,

TA = +25°C

IRSET = 36kΩ,

TA = -40°C to +80°C

-1.1 ±0.7 +1.1

%

-1.5

+1.5

%

-2

+2

%

VSC

Channel Short Circuit Threshold

Vtemp

Over-Temperature Threshold

Vtemp_acc

Over-Temperature Threshold Accuracy

VOVP

Overvoltage Limit on OVP Pin

DIGITAL INTERFACE

3.3

4.6

V

150

°C

5

°C

1.18 1.22 1.24

V

VIL

Logic Input Low Voltage

VIH

Logic Input High Voltage

CURRENT SOURCES

0.8

V

1.5

5.5

V

VHEADROOM

Dominant Channel Current Source

Headroom at CH Pin

ILED = 50mA

TA = +25°C

1.0

V

6

FN6998.1

November 5, 2009

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