EP11 datasheet(22/46 Pages) POWERINT

Part #	EP11

Description	Engineering Prototype Report - 70 W (19 V 3.66A) Universal Input Adapter (EP11)

PDF	46 Pages

Scroll/Zoom	100%

Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

Logo

22 / 46 page

EPR-00011 - 70 W Adapter

22-Jan-01

Page 22 of 46

Power Integrations Inc

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

www: http://www.powerint.com

Figure 12 - Schematic cross-section of enclosure

Note: The diagram above shows an exploded view. In actual construction,

there are no air gaps between the board, copper heat spreader and case.

The main path for heat dissipation is via conduction therefore air gaps,

even small, greatly increase the thermal impedance from the heatsinks to

ambient.

Air gaps will reduce power capability and increase the

temperature of components.

Thermal Results in Enclosure

100

120

140

Elapsed Time (Hours)

Top249 tab

Bridge

CM Choke

Bulk/Xcap

Opto

Enc. Top

Enc. Side

Snubber

T-former

D5 tab

D1 tab

Ambient 1

Ambient 2

Figure 13 - Thermal results in enclosure at elevated ambient with 60, 65,70, and 72.5 Watt loads – 90 VAC

72.5 W

70 W

65 W

60 W

EP11 Datasheet(PDF) 22 Page - Power Integrations, Inc.