EPR-33 datasheet(22/32 Pages) POWERINT

Part #	EPR-33

Description	Engineering Prototype Report for EP 33 - 45 W LCD Monitor External Power Supply using TOP247Y (TOPSwitch-GX)

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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22 / 32 page

EPR-33 – 45 W External Adapter Supply

28-Mar-2003

Page 22 of 32

Power Integrations, Inc.

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

www.powerint.com

11.4

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 20 - 115 VAC Transient Response.

75%-100%-75% Load Step.

Top: Load Current, 2 A/div.

Bottom: Voltage at Supply Output

100 mV, 500

µs/div.

Figure 21 - 230 VAC Transient Response.

75%-100%-75% Load Step.

Top: Load Current, 2 A/div.

Bottom: Voltage at Supply Output

100 mV, 1 ms/div.

Figure 22 - 115 VAC Transient Response.

75%-100%-75% Load Step

at End of Cable.

Top: Load Current, 2 A/div.

Bottom: Voltage at End of Cable

100 mV, 500

µs/div.

Figure 23 - 230 VAC Transient Response

75%-100%-75% Load Step

at End of Cable.

Top: Load Current, 2 A/div.

Bottom: Voltage at End of Cable

100 mV, 1 ms/div.

EPR-33 Datasheet(PDF) 22 Page - Power Integrations, Inc.