Ripple Voltage and Current
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Figure 7
and
Figure 8
show the FAUX and RAUX input power up sequence, respectively.
Horizontal Resolution: 5 ms/div.
Trace 1: AUX input voltage (VIN to RTN pins). 10V/div.
Trace 2: The 3.3V output voltage. 2V/div.
Trace 3: The input current. 1A/div.
Figure 7. Normal FAUX Input Startup Sequence
Horizontal Resolution: 5 ms/div.
Trace 1: AUX input voltage (VIN to RTN pins). 10V/div.
Trace 2: The 3.3V output voltage. 2V/div.
Trace 3: The input current. 1A/div.
Figure 8. RAUX Power Up Sequence
18
Ripple Voltage and Current
Figure 9
shows the output ripple voltage and input ripple current when the evaluation board is configured
to use the on-board DC-DC Buck regulator. The differential mode input filter is used during the test.
Horizontal Resolution: 5 µs/div.
Trace 1: The output ripple voltage (AC coupled). 20 mV/div.
Trace 2: The input ripple current (AC coupled). 20 mA/div.
Figure 9. The Evaluation Board Ripple Voltage and Current
12
AN-1574 LM5073 Evaluation Board
SNVA214A – April 2007 – Revised April 2013
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