_________________________________________________________________________________________________________

Copyright © 2015

Microsemi

Page 3 of 20

Rev.2.0, 17-Jan-2017

CPG

– PoE BU

One Enterprise Aliso Viejo, CA 92656 USA

PD70101 / PD70201

Datasheet

Pin

Number

PD70101

Pin Name

PD70201

Pin Name

Description

5

VPN_IN

VPN_IN

VPort Negative Input: Connected to the isolating switch input N-channel

MOSFET source.

6

N/C

N/C

Not Used.

7

N/C

AT_FLAG

Open Drain Output (active low): This flag indicates if the chip detects an

IEEE 802.3at compliant PSE.

8

VPN_OUT

VPN_OUT

VPort Negative Output: Connected to the isolating switch output. N-

channel MOSFET Drain.

9

N/C

N/C

Not Used.

10

ENABLE

ENABLE

Logic level Enable input for DC-DC controller. Pulling this pin to VL turns

on the DC-DC controller. This allows the DC-DC controller to be turned

on without power to the PD interface.

11

VINS

VINS

VPP input voltage sensing for UVLO comparator. Connect to an external

resistor divider from VPP to GND. Threshold is 1.2V reference.

12

HYST

HYST

Output of the VINS/UVLO comparator. This pin is used for VPP UVLO

hysteresis programming.

13

SYNC

SYNC

External Clock synchronization for the DC-DC controller. Connect an

external clock as defined in the EC table to this pin to synchronize the

DC-DC converter switching frequency to this clock. PG rising edge is

synchronized with the clock rising edge.

14

RFREQ

RFREQ

DC-DC Switching Frequency Setting. Connect a resistor from this pin to

GND to set the switching frequency.

15

SS

SS

Soft-start: Connect a capacitor from this pin to GND to set the soft-start

time of the DC-DC converter. This capacitor is charged with an internal

current source to 1.2V.

16

RCLP

RCLP

Low Power Mode Clamp. Connect a resistor from this pin to GND to

program the LPM clampimg voltage or connect this pin to GND to disable

LPM.

17

VSN

VSN

Differential Amplifier's negative input. Connect this to the junction of a

resistor divider from Vo- to GND for the Direct Buck converter

application.

18

VSP

VSP

Differential Amplifier's positive input. Connect this to the junction of a

resistor divider from Vo+ to GND for the Direct Buck converter

application.

19

COMP

COMP

Error Amplifier Output. Short to FB pin when driven directly with an

optoisolator for Isolated DC-DC Converter. Connect to FB via RC

compensation networks for Non-Isolated Direct Buck Converter.

20

DAO

DAO

Differential Amplifier Output. Connect to FB (externally) for Non-Isolated

Direct Buck Converter.

21

FB

FB

Inverting Input of the Error Amplifier. Connect to opto-coupler for Isolated

DC-DC. Connect to RC compensation networks for Non-isolated DC-DC

22

GND

GND

This is Analog GND. Connect to a local AGND plane. Soft-start capacitor

and the frequency setting resistor return to this local GND plane.