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LX1993 Datasheet

  • LX1993

  • Microsemi Corporation [High Efficiency LED Driver]

  • 453.89KB

  • MICROSEMI

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LX1993
I N T E G R A T E D
P R O D U C T S
High Efficiency LED Driver
P
RODUCTION
APPLICATION INFORMATION
(CONTINUED)
WWW .
Microsemi
.C
OM
Figure 3:
LXE1993 Engineering Evaluation Board
Pin Name
VBAT
VCC
VPOT
VADJ IN
/SHDN
VOUT
VFDBK
Table 1: Input and Ouput Pin Assignments
Allowable Range
Description
0 to 6V
1.6V to 6V
1.6V to 6V
0 to 350mV
0 to VCC
0 to 18V
0 to 400mV
Main power supply for output. (Set external current limit to 0.5A)
LX1993 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 (10K鈩?, Ground to inhibit the LX1992.
Power supply output voltage that is applied to LED string.
Sense resistor voltage. Divide this voltage by 15 to determine LED current.
Jumper Position
VCC/ BAT
VCC/ SEP
VPOT/ VBAT
VPOT/ SEP
ADJ/ POT
ADJ/ EXT
LED# OFF
Table 2: Jumper Pin Position Assignments
Functional Description
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
LX1993 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.
Use this position to short out LED # 3 and / or LED # 4.
A
PPLICATIONS
A
PPLICATIONS
Note: Always put jumpers in one of the two possible positions
Copyright
漏
2000
Rev. 1.0b, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7

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