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PM8801 数据表(PDF) 21 Page - STMicroelectronics

部件名 PM8801
功能描述  High-efficiency, IEEE 802.3at compliant, integrated PoE-PD interface and PWM controller
PDF  37 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM8801 数据表(HTML) 21 Page - STMicroelectronics

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PM8801
PD interface
A low T2P signal after the turn-on phase of the PD means that the device is connected to a
Type2, 2-event physical layer classification PSE which may allocate power either through
further LLDP negotiation or directly feeding the PD with the required power.
In isolated applications, the main circuits and the PM8801 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
AM045039v1
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
AM045040v1



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