Datasheet

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3.5 Waveforms
3.5.1 Soft Start
When applying power to the LM5117 evaluation board, a certain sequence of events occurs. Soft-start
capacitor and other components allow for a linear increase in output voltage. Figure 2 shows the output
voltage during a typical start-up with a load of 1.5Ω
Conditions:
Input Voltage = 48VDC
1.5Ω Load on the output
Traces:
Top Trace: Output Voltage, Volt/div = 5V
Bottom Trace: Inductor Current, Amp/div=5A
Horizontal Resolution = 2ms/div
Figure 2. Start-Up With Resistive Load
3
SNVA466B–May 2011–Revised April 2013 AN-2103 LM25117 Evaluation Board
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