Title
Engineering Prototype Report for EP-68 –
6.6 W DC-DC Flyback Converter Using
DPA-Switch
™
(DPA423G)
Specification
Input: 36-57 VDC, Output: 3.3 V / 2 A
Application
Author
Document
Number
Date
Revision
Power over Ethernet (PoE) Power Supply
Power Integrations Applications Department
EPR-68
19-Jul-2005
1.1
Summary and Features
•
High efficiency, low parts count and low cost power supply
•
Ideally suited for PoE, VoIP, standby and other distributed 48 V DC-DC
conversion applications
•
Signature circuit is fully compatible with IEEE 802.3af requirements
•
DPA-Switch
Integrates
•
PWM controller and 220 V MOSFET switching device
•
Accurate input voltage UV detection and OV protection
•
Thermal, overload, short-circuit and open loop protection
•
Regulation at zero load (cycle skipping)
•
Accurate 400 kHz trimmed internal oscillator
•
Small footprint 2"
×
1", low overall height 0.9", dual layer PCB
•
100% surface mount construction
The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found
at
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
POWERINT [ POWER INTEGRATIONS, INC. ]
