LX1742 Просмотр технического описания (PDF) - Microsemi Corporation
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LX1742 Datasheet PDF : 13 Pages
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INTEGRATED PRODUCTS
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
30
25
20
15
10
5
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7
Adj ustment Voltage
Figure 9 – Typical VOUT versus VADJ
0 ~ 0.4V : LX1742 uses internal 1.2V reference.
0.5V ~ 0.7V : transition from internal to external reference.
0.8 to 1.5V : LX1742 defaults to external voltage reference.
100%
90%
80%
70%
60%
50%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Output Current
Figure 10 – Efficiency vs. Output Current (mA)
Top: VIN = 3.6V, VOUT = 5.2V, L1 = 47.0µH
Bottom: VIN = 5.5V, VOUT = 18.0V, L1 = 47.0µH
Figure 11 – Typical switching waveforms:
Ch1 – Switch voltage; Ch2 – Output voltage; Ch4 – Inductor current.
(VIN = 3.6V, VOUT = 18V, RLOAD = 2KΩ)
1.40
1.30
1.20
1.10
1.00
0
25
50
75
Temperature oC
Figure 12 – Typical RDS(on) vs. Temperature
Condition: VIN = 3.0V; ISW = 10mA
Copyright © 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 12
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