DAK-86: POE, 6.6 W, 3.3V @ 2.0A, 33 ~ 57 V in

Summary

A flyback topology was used to minimize circuit board size, parts count and cost. This topology also provides excellent operating efficiency across the input voltage range.

The DPA423G IC implements PWM control of the internal power MOSFET and initiates a soft start-up function when it first powers up. The IC also monitors die temperature as part of its over-temperature protection function and also monitors the input voltage as part of its under-voltage detection and overvoltage shutdown functions.

The integrated 220 V MOSFET provides excellent switching characteristics at the selected 400 kHz operating frequency. The MOSFET and controller consume very little power, giving good efficiency across the entire input voltage operating range.

Specifications

Manufacturer Power Integrations
Category Power Management
Sub-Category POE - Power Over Ethernet
Eval Board Part Number 596-1195-ND
Eval Board Supplier Power Integrations
Eval Board Board not Stocked
Compliance IEEE 802.3af (802.3at Type 1)
Outputs and Type 1 Isolated
Voltage Out 3.3 V
Current Out 2 A
Voltage In 33 ~ 57 V
Efficiency @ Conditions >72%, 48V in, 3.3V @ 0.6 ~ 2 A
Internal Switch Yes
Features Current Limit (Adj. or Fixed)
Light Load Mode
Over Voltage Protection
Short Circuit Protection
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 400 kHz
Component Count + Extras 61 + 2
Application / Target Market PoE, Power Over Ethernet
Design Author Power Integrations
Main I.C. Base Part DPA423
Date Created By Author 2006-04
Date Added To Library 2011-05

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