DER-37 datasheet(23/32 Pages) POWERINT

23 / 32 page

DER-37

16W Adapter using TOP245P

April 27, 2004

Page 23 of 32

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

12.3 Drain Voltage and Current Start-up Profile

Figure 19 - 90 VAC Input and Maximum Load.

Upper: VDRAIN, 200 V & 1 ms / div.

Lower: IDRAIN, 0.5 A / div.

Figure 20 - 265 VAC Input and Maximum Load.

Upper: VDRAIN, 200 V & 1 ms / div.

Lower: IDRAIN, 0.5 A / div.

12.4 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 21 – Transient Response, 115 VAC, 75-100-

75% Load Step.

Waveform: Output Voltage

100 mV, 500

µs / div.

Figure 22 – Transient Response, 230 VAC, 75-100-

75% Load Step

Waveform: Output Voltage

100 mV, 500uS / div.

DER-37 Datasheet(PDF) 23 Page - Power Integrations, Inc.