LX1994

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 3

High Efficiency LED Driver

Copyright

© 2003

Rev. 1.0d, 2006-02-09

TM

®

ELECTRICAL CHA RACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature -40

°C

LX1994

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operating Voltage

2.0

5.5

V

Minimum Start-up Voltage

2.0

V

Start-up Voltage Temperature

Coefficient

For Reference Only

-2

mV/

°C

SHDN = VIN, No external FET

100

200

μA

Quiescent Current

SHDN = GND

0.35

1

μA

BRT Full scale bias current

IBRT

S/P = VIN, VBRT = GND, ILS = 0A

7.5

10.5

13.5

μA

BRT Light sensor current

IBRT

S/P = VIN, VBRT = GND, ILS = 100

μA

110

μA

S/P Logic Low Voltage

0.6

V

S/P Logic High Voltage

1.4

V

S/P Input DC Bias Current

S/P = VIN

-1

0.05

1

μA

S/P PWM frequency

10

1000

KHz

S/P Pulse Width

50

ns

BRT PWM Voltage

VBRT

VS/P = VIN (DCS/P = 100%)

270

300

330

mV

BRT PWM Voltage

VBRT

DCS/P = 50%, FPWM = 100KHZ

150

mV

Feedback Comparator Offset

VOS

VFB – VBRT, VBRT = 0mV

4

mV

SCR peak current

IPK

180

240

300

mA

Efficiency

η

92

%

DRV Sink/Source Current

140

200

mA

Maximum Switch On-Time

10

15

20

μs

Minimum Switch Off-Time

240

350

460

ns

OVP Threshold Voltage

1.10

1.22

1.34

V

OVP Input Bias Current

-50

50

nA