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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
CHARACTERISTIC CURVES
WWW .
Microsemi
.C
OM
365
340
I
PEAK
(mA)
315
290
265
240
215
190
0
1000
2000
3000
4000
R
CS
(Ohms)
Figure 5: Example of Peak Current versus R
CS
value
Conditions:
V
IN
= 2.5V (
bottom
), 3.3V (
middle
) & 4.5V (
top
)
@ T
A
= 25
o
C
Figure 6: V
OUT
and Inductor Current Waveforms.
Channel 1: V
OUT
(AC coupled; 100mV/div)
Channel 2: Inductor Current (100mA/div.)
4 LED Configuration: V
IN
= 3.0V
85%
80%
90%
85%
80%
Efficiency
Efficiency
75%
70%
65%
60%
55%
50%
1
6
11
LED C ur r ent ( mA )
16
75%
70%
65%
60%
55%
50%
1
6
11
LED C ur r ent ( mA )
16
21
Figure 7: Efficiency vs. LED Output Current.
2 LED Configuration: V
IN
= 3.5V, L = 47碌H, R
CS
= 100鈩?/div>
Note: Data taken from LXE1993 Evaluation Board
100%
90%
Figure 8: Efficiency vs. LED Output Current.
2 LED Configuration: V
IN
= 5.0V, L = 47碌H, R
CS
= 100鈩?/div>
Note: Data taken from LXE1993 Evaluation Board
100%
90%
Efficiency
80%
70%
60%
50%
0
5
10
15
LED C ur r ent ( mA )
20
Efficiency
80%
70%
60%
50%
0
5
10
15
LED C ur r ent ( mA )
20
C
HARTS
C
HARTS
Figure 9: Efficiency vs. LED Output Current.
4 LED Configuration: V
IN
= 3.5V, L = 47碌H, R
CS
= 100鈩?/div>
Note: Data taken from LXE1993 Evaluation Board
Figure 10: Efficiency vs. LED Output Current.
4 LED Configuration: V
IN
= 5.0V, L = 47碌H, R
CS
= 100鈩?/div>
Note: Data taken from LXE1993 Evaluation Board
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 9

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