PD70224 datasheet(17/31 Pages) MICROCHIP

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Pin Number

PD70101 Pin

Name

PD70201 Pin Name Description

CSN

Negative Input of the Current Sense Amplifier. Kelvin

connect to the PGND side of the primary current sense

resistor.

CSP

Positive Input of the Current Sense Amplifier. Kelvin connect

to the Non-PGND side of the primary current sense resistor.

Primary Gate Driver. Connect to the gate of the primary side

Power MOSFET, directly or via a resistor.

5V High side ( VCC reference) internal LDO Output.

Connect a 0.1 µF or higher ceramic cap from VH to VCC.

VCC

Input Supply to the DC-DC Controller. Connect a 4.7 µF or

higher ceramic capacitor from this pin to PGND. Alternately,

a parallel combination of 1 µF ceramic and greater than 10

µF electrolytic capacitor can be used.

VAUX

Auxiliary voltage reference to VPN_OUT; this voltage can be

used for DC-DC start up when operated with a bootstrapped

voltage source. For applications with POE power only

connect directly to VCC; for applications using multiple

power sources (such as a wall adapter), connect to VCC pin

through a small, low current, 30 V rated schottky diode.

VPP

This is the positive terminal of the POE input port. Connect

to the positive terminal of the input bridges at the CDET

positive side.

Exposed Pad

Thermal Pad; electrically connected to VPN_IN. For proper

thermal management should be tied to a large copper fill or

plane that is electrically connected to VPN_IN.

PD70101 and PD70201

Pin Configuration

Datasheet

DS00003738A-page 17

PD70224 Datasheet(PDF) 17 Page - Microchip Technology