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APEC2007 Fiches technique(PDF) 5 Page - Power Integrations, Inc.

No de pièce APEC2007
Description  Energy-Efficient Peak-Current Controlled Power Conversion IC Family Delivers 3 to 28 Watts in Universal-Input
PDF  19 Pages
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Fabricant  POWERINT [Power Integrations, Inc.]
Site Internet  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

APEC2007 Fiches technique(HTML) 5 Page - Power Integrations, Inc.

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APEC 2007 Session T8: Semiconductor Devices
Slide# 5
Overview of How IC Interacts with Power Supply
•
V
OUT is compared to a reference (Zener Diode)
•
When V
OUT > ref set-point, Zener and opto-LED conduct, photo-
transistor pulls current from EN/UV pin, which disables switching
•
As switching cycles are skipped, V
OUT drops below ref set-point,
Zener and opto-LED stop conducting…, which enables switching
Controller continually
enables/disables
MOSFET switching to
keep V
OUT in regulation



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