This document details the characteristics and performances of the PM8800 demonstration kit which has been designed to cover a broad range of power over Ethernet (PoE) applications. PM8800 is a highly integrated device embedding an IEEE802.3af compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources.
Even though PM8800 can be configured to work in both isolated and non-isolated topologies, this application note focuses on an isolated topology only.
The PM8800 demonstration kit supports diode as well as synchronous rectification.
Auxiliary sources can be connected to the board on 2 input points. One input allows prevalence of the auxiliary sources with respect to the PoE, while the other input allows the usage of a wall adaptor with voltage lower than the internal PoE UVLO threshold and still benefits from the inherent inrush and DC current limit.
| Manufacturer | STMicroelectronics |
|---|---|
| Category | Power Management |
| Sub-Category | POE - Power Over Ethernet |
| Eval Board Part Number | 497-6366-ND |
| Eval Board Supplier | STMicroelectronics |
| Eval Board |
ABC
|
| Topology |
Step Down
|
| Outputs and Type |
1 Isolated
|
| Voltage Out |
5 V
|
| Current Out |
4 A
|
| Voltage In |
30 ~ 60 V
|
| Efficiency @ Conditions |
>83%, ?V in, 5V @ 1.5 ~ 4 A
|
| Features |
Current Limit (Adj. or Fixed)
Power Good Output Soft Start Thermal Protection Under Voltage Protection, Brown-Out |
| Switching Frequency |
250 kHz
|
| Component Count + Extras |
86 + 18
|
| Design Author |
STMicroelectronics
|
| Internal Switch |
No
|
| Main I.C. Base Part |
PM8800
|
| Application / Target Market |
Telecom
|
| Date Created By Author | |
| Date Added To Library | 2017-05 |
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