DER-53

105C Dual Output Cook top Power Supply

April 20, 2005

Page 21 of 27

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10.3 Drain Voltage and Current Start-up Profile

Figure 14 - 85 VAC Input and Maximum Load.

Figure 15 - 265 VAC Input and Maximum Load.

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

In the figures shown below, signal averaging was used to better enable viewing the load

transient response.

The oscilloscope was triggered using the load current step as a

trigger source. Since the output switching and line frequency occur essentially at random

with respect to the load transient, contributions to the output ripple from these sources

will average out, leaving the contribution only from the load step response.

Figure 16 – Transient Response, 115 VAC, 75-100-

75% Load Step.

Top: Load Current, 200mA/div.

Bottom: Output Voltage

50 mV, 500

µs / div.

Figure 17 – Transient Response, 230 VAC, 75-100-

75% Load Step

Upper: Load Current, 200mA/ div.

Bottom: Output Voltage

50 mV, 2 ms / div.