ISL97636 Просмотр технического описания (PDF) - Intersil

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ISL97636

8-Channel LED Driver

Intersil 

ISL97636

Electrical Specifications

All specifications below are tested at TA = -40°C to +85°C; VIN = 12V, EN = 5V, RSET = 36.6kΩ; Parameters

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

Eff_peak

Peak Efficiency

VIN = 18V, 72 LEDs,

91

%

20mA each, L = 8.2µH

with DCR 106mΩ,

TA = +25°C

VIN = 12V, 72 LEDs,

90

%

20mA each, L = 8.2µH

with DCR 106mΩ,

TA = +25°C

VIN = 6V, 72 LEDs,

86

%

20mA each, L = 8.2µH

with DCR 106mΩ,

TA = +25°C

ΔIOUT/ΔVIN

Line Regulation

0.1

%

Dmax

Boost Maximum Duty Cycle

82

%

Dmin

Boost Minimum Duty Cycle

7

%

fS

ILX_leakage

Switching Frequency

LX Leakage Current

VLX = 36V, EN = 0

1.0

1.2

1.3

MHz

10

µA

REFERENCE

Imatch

Channel-to-Channel Current Matching

IACC

Current Accuracy

FAULT DETECTION

IOUT = 30mA

-3.5

±1

+3.5

%

±3

%

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

Vheadroom

VRSET

ILEDmax

FAULT PIN

Dominant Channel Current Source

Headroom at IIN Pin

Voltage at RSET Pin

Maximum LED Current Per Channel

ILED = 20mA

TA = +25°C

RSET = 36.6kΩ

RSET = 20.9kΩ

100

mV

680

700

720

mV

35

mA

Ifault

Fault Pull-down Current

VIN = 12V

10

18

30

µA

Vfault

FAULT Clamp Voltage with Respect to VIN VIN = 12, VIN - Vfault

7.5

V

IlxStartup

LX Start-up Current

VDC = 5.2V

1

2.7

7

mA

5

FN6570.0

May 9, 2008

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