SC1417BEVB データシートの表示（PDF） - Semtech Corporation
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SC1417BEVB Datasheet PDF : 11 Pages
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POWER MANAGEMENT
Typical Characteristices (Cont.)
2-Cell to 5V Converter
Efficiency
90
80
70
60
50
40
1
10
100
Load current (mA)
SC1417B
Vin 3.0V
Vin 2.2V
Vin 1.65V
1000
Scope plot of Boost Converter waveforms in Constant Brightness LED driver
Vin = 3V, Vout = 11.9V, Iout = 40mA, L = 15uH
Cin = 10uF, 6.3V tant. Cout = 1uF, ceramic, (see above schematic for other components used)
Ch1: Switching Node, Ch2: Vout ripple, Ch4: Current in inductor, (100mA/div)
Inductor current ripple = 170mA pk-pk
2006 Semtech Corp.
8
www.semtech.com
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