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PM8801TR Datasheet(PDF) 2 Page - STMicroelectronics

Part # PM8801TR
Description  High-efficiency, IEEE 802.3at compliant, integrated PoE-PD interface and PWM controller
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Contents
PM8801
2/37
DocID018560 Rev 2
Contents
1
Typical application circuit and block diagram . . . . . . . . . . . . . . . . . . . . 6
1.1
Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2
Block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2
Pin descriptions and connection diagram . . . . . . . . . . . . . . . . . . . . . . 10
3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4
PD interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1
Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2
Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3
Indication of successful 2-event classification . . . . . . . . . . . . . . . . . . . . . 20
4.4
Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.5
Inrush and DC current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.6
Sleep mode / MPS mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7
LED driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8
Wakeup from sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.9
High-voltage startup regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.10
5 V bias regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5
PWM controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1
Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2
Delay time control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.4
PWM comparator / slope compensation . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5
Current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31


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