19-Jul-2005

EP68 3.3 V, 2 A DC-DC Power Supply

10.4 Load Transient Response (75% to 100% Load Step)

In the following two oscilloscope screen shots (Figures 17 and 18), signal averaging was

used to more clearly capture the output voltage response to a load transient. Averaging

minimizes the appearance of the 400 kHz switching ripple in the output voltage scope

plot. The load current step was used to trigger the horizontal sweep of the oscilloscope.

Figure 17

- Transient Response,

36 VDC, 75-100-75% Load Step.

Top: Load Current, 1 A / div.

Bottom: Output Voltage,

20 mV, 500

µs / div.

Figure 18

- Transient Response,

57 VDC, 75-100-75% Load Step.

Top: Load Current, 1 A / div.

Bottom: Output Voltage,

20 mV, 500

µs / div.

Page 17 of 28

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