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PM8803TR Scheda tecnica(PDF) 20 Page - STMicroelectronics

Il numero della parte PM8803TR
Spiegazioni elettronici  High-efficiency, IEEE 802.3at compliant integrated PoE-PD interface and PWM controller
PDF  34 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8803TR Scheda tecnica(HTML) 20 Page - STMicroelectronics

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PD interface
PM8803
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Doc ID 018559 Rev 2
A low T2P signal after the turn-on phase of the POE means that the PD is connected to a
Type2, 2-event physical layer classification PSE which may allocate power either through
further LLDP negotiation or directly feedthe PD with the required power.
In isolated applications, the main circuits and the PM8803 are at both sides of the galvanic
isolation. The T2P signal is normally connected to an optocoupler to pass the
Type 2, 2-event PSE detection information to the main circuit in the PD system.
Figure 7.
T2P signal when connected to PSE supporting 1-event classification
Figure 8.
T2P signal when connected to PSE supporting 2-event classification
Time
Idle or Mark Range
Classification Range
On range
Detection
Time
OUTPUT VOLTAGE
Soft Start
V
Time
T2P (802.3af)
V
T2P stable before
output soft-start
AM045097v1
Time
Idle or Mark Range
Classification Range
On range
Detection
Time
OUTPUT VOLTAGE
Soft Start
V
Time
T2P (802.3at)
V
T2P stable before
output soft-start
AM045098v1



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