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ISL97673

6-Channel SMBus or PWM Dimming LED Driver with Phase Shift Control

Intersil 

ISL97673

Electrical Specifications

All specifications below are tested at TA = +25°C; VIN = 12V, EN/PWM = 5V, RSET = 20.1kΩ,

unless otherwise noted. Boldface limits apply over the operating temperature range,

-40°C to +85°C. (Continued)

PARAMETER

DESCRIPTION

CONDITION

MIN

MAX

(Note 8) TYP (Note 8) UNIT

BOOST

SWILimit

rDS(ON)

SS

Boost FET Current Limit

Internal Boost Switch ON-resistance

Soft-start

TA = +25°C

100% LED Duty Cycle

1.5

2.0

2.7

A

235

300

mΩ

7

ms

Eff_peak Peak Efficiency

ΔIOUT/ΔVIN

DMAX

Line Regulation

Boost Maximum Duty Cycle

VIN = 12V, 72 LEDs, 20mA

92.9

%

each, L = 10µH with DCR

101mΩ, TA = +25°C

VIN = 12V, 60 LEDs, 20mA

90.8

%

each, L = 10µH with DCR

101mΩ, TA = +25°C

0.1

%

FSW = 1, 600kHz

90

%

FSW = 0, 1.2MHz

81

DMIN

Boost Minimum Duty Cycle

FSW = 1, 600kHz

FSW = 0, 1.2MHz

9.5

%

17

fOSC_hi

fOSC_lo

ILX_leakage

Lx Frequency High

Lx Frequency Low

Lx Leakage Current

FSW = 1, 600kHz

FSW = 0, 1.2MHz

LX = 45V, EN = 0

475

0.97

600

1.14

640

1.31

10

kHz

MHz

µA

FAULT DETECTION

VSC

Short Circuit Threshold Accuracy

Reg0x08, SC[1:0] = 01

3.15

3.6

4.3

V

Reg0x08, SC[1:0] = 10

4.2

4.8

5.4

V

Reg0x08, SC[1:0] = 11

5.2

5.85

6.6

V

Temp_shtdwn Temperature Shutdown Threshold

150

°C

Temp_Hyst Temperature Shutdown Hysteresis

23

°C

VOVPlo

Overvoltage Limit on OVP Pin

OVPfault

OVP Short Detection Fault Level

CURRENT SOURCES

1.19

1.25

V

400

mV

IMATCH

DC Channel-to-Channel Current Matching

RSET = 20.1kΩ,

Reg0x00 = 0xFF

(IOUT = 20mA)

±0.7 ±1.0

%

IACC

Current Accuracy

-1.5

+1.5

%

Vheadroom

Dominant Channel Current Source Headroom at ILED = 20mA

FBx Pin

TA = +25°C

500

mV

VRSET

Voltage at RSET Pin

RSET = 20.1kΩ

1.2

1.22 1.24

mV

ILEDmax

Maximum LED Current per Channel

VIN = 12V, VOUT = 45V,

40

mA

Fsw=1.2MHz, TA = +25°C

PWM GENERATOR

VIL

Guaranteed Range for PWMI Input Low Voltage

0.8

V

VIH

Guaranteed Range for PWMI Input High Voltage

1.5

VDD

V

FPWM

PWMI Input Frequency Range

200

30,000 Hz

PWMACC PWM Input Accuracy

8

bits

6

FN7633.0

June 24, 2010

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