LX1992CLM Microsemi Analog Mixed Signal Group, LX1992CLM Datasheet - Page 7

• Manufacturer Part Number: LX1992CLM
• Description: IC LED DRIVR WT/CLR BCKLGT 8-MLP
• Manufacturer: Microsemi Analog Mixed Signal Group
• Type: Backlight, White LED, Color LEDr

Specifications of LX1992CLM

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Backlight
• Type - Secondary: Color, White LED
• Voltage - Supply: 1.6 V ~ 6 V
• Mounting Type: Surface Mount
• Package / Case: 8-MLP
• Operating Temperature: 0°C ~ 70°C
• Current - Output / Channel: 50mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Frequency: -

Copyright © 2000
Rev. 1.1b, 2005-03-03
Note: Always put jumpers in one of the two possible positions
Jumper Position
Pin Name
VADJ IN
TM
VFDBK
VPOT/ VBAT
/SHDN
VPOT
VOUT
VPOT/ SEP
VBAT
VCC
VCC/ BAT
VCC/ SEP
ADJ/ POT
ADJ/ EXT
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Allowable Range
Use this position when powering VBAT and VCC from the same supply. Do not connect power to the VCC
input when using this jumper position.
Use this position when using a separate VCC supply (different from VBAT).
Use this position when powering the potentiometer reference circuit from the VBAT supply. Do not connect
power to the VCC input when using this jumper position.
Use this position when using a separate power supply (different from VBAT) to power the potentiometer
reference circuit. This will lower the VBAT current and provide a more accurate efficiency reading for the
LX1992 circuit.
Use this position when using the potentiometer to adjust LED current.
Use this position when adjusting the LED current with an external PWM that has a repetition rate >120Hz. Or
when using a DC adjustment voltage.
0 to 350mV
0 to 400mv
1.6V to 6V
1.6V to 6V
0 to VCC
0 to 18V
0 to 6V
A P P L I C A T I O N I N F O R M A T I O N
Figure 5: LXE1992 Engineering Evaluation Board
Table 2: Jumper Pin Position Assignments
Table 1: Input and Ouput Pin Assignments
Linfinity Microelectronics Division
Main power supply for output. (Set external current limit to 0.5A)
LX1992 power. May be strapped to VBAT or use a separate supply if VCC jumper is in
the SEP position. Do not power output from VCC pin on board..
Potentiometer power. May be strapped to VBAT or use a separate supply if VPOT
jumper is in the SEP position. Do not power output from VPOT pin on board.
Apply a DC voltage or a PWM voltage to this pin to adjust the LED current. PWM
inputs should be greater than 120Hz and DC portion less than 350mV.
Pulled up to VCC on board (10KΩ), Ground to inhibit the LX1992.
Sense resistor voltage. Divide this voltage by 15 to determine LED current.
Power supply output voltage that is applied to LED string.
®
Microsemi
Functional Description
High Efficiency LED Driver
( C O N T I N U E D )
P
Description
RODUCTION
D
ATA
S
HEET
LX1992
Page 7