The following illustration shows a basic block diagram using PD70100 or PD70200.

Figure 1. Basic PD Block Diagram

Cinput

100nF

Dectec�on

Classifica�on

(if not present

Class 0 for

802.3af)

PHY

Applica�on

1

2

3

6

4

5

7

8

Start Up

Isola�on

Start Up In Rush

Current Limit

DC/DC

PD70100 – PD70200

PD70100 – PD70200

VAUX

LX7309

PWM

Controller

Rdet

25K

Microchip offers complete reference design packages and Evaluation Boards (EVBs). For access to these design

packages, device datasheets, or application notes, consult your local Microchip Client Engagement Manager or visit

our website at www.microchip.com/poe. For technical support, consult your local consult your local Embedded

Solutions Engineers or go to microchipsupport.force.com/s/. For help in designing the DC/DC portion of your circuit,

please try our MPLAB Analog Designer (MAD) tool at www.microchip.com/mad-poe.

PD70100/PD70200

Datasheet

DS00003639A-page 3