LX1992-02W EVAL KIT MICROSEMI, LX1992-02W EVAL KIT Datasheet - Page 9

• Manufacturer Part Number: LX1992-02W EVAL KIT
• Manufacturer: MICROSEMI

Specifications of LX1992-02W EVAL KIT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Copyright © 2000
Rev. 1.1b, 2005-03-03
Figure 5: V
Figure 7: Gate Drive Voltage vs. Drive Current
TM
Channel 1: V
Channel 2: Inductor Current (100mA/div.)
Configuration: V
Figure 9: Efficiency vs. LED Output Current.
100%
Note: Data taken from LXE1992 Evaluation Board
90%
80%
70%
60%
50%
Configuration: V
5
4
3
2
1
0
0
0
2
20
OUT
OUT
4
(AC coupled; 200mV/div)
IN
and Inductor Current Waveforms.
40
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
= 3.0V, V
6
at T = 25
IN
8
= 5.0V, L = 47µH, R
Driv e Current (mA)
60
LED Current (mA)
10
OUT
80
o
12
C.
= 13.0V, I
14
100
16
18
120
C H A R A C T E R I S T I C C U R V E S
IN
CS
= 65mA
20
= 4KΩ
Linfinity Microelectronics Division
140
22
24
160
®
Microsemi
Efficiency Measurement Hint: When doing an efficiency
evaluation using the LX1992 Evaluation Board, VPOT should
be driven by a separate voltage supply to account for losses
associated with the onboard reference (i.e., the 1.25V shunt
regulator and 1K Ω resistor). This circuit will have VBAT -
1.25V across it and at the higher input voltages the 1K Ω
resistor could have as much as 4mA through it. This shunt
regulator circuitry will adversely effect the overall efficiency
measurement and is not normally used in an application.
Therefore it should not be considered when measuring
efficiency.
Figure 6: V
Configuration: V
Channel 1: V
Channel 2: Inductor Current (100mA/div.)
Figure 8: Efficiency vs. LED Output Current.
90%
80%
70%
60%
50%
Note: Data taken from LXE1992 Evaluation Board
Configuration: V
High Efficiency LED Driver
P
0
RODUCTION
2
OUT
OUT
IN
(AC coupled; 100mV/div)
and Inductor Current Waveforms.
4
= 3.0V, V
IN
LED Current (mA)
= 3.0V, L = 47µH, R
6
D
OUT
8
ATA
= 13.7V, I
10
S
HEET
12
IN
CS
14
= 120mA
= 4KΩ
16
LX1992
18
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