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DI-88

更新时间: 2022-04-23 23:00:11
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帕沃英蒂格盛 - POWERINT /
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描述
PoE Detection and Classification (Class 0-3) Interface Circuit

DI-88 数据手册

 浏览型号DI-88的Datasheet PDF文件第2页 
Design Idea DI-88  
DPA-Switch® PoE Detection and  
Classification (Class 0-3) Interface Circuit  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
PoE/VoIP  
DPA423G  
6.49 W  
36-57 VDC  
3.3 V  
Flyback  
Classification occurs as the input voltages rises from 14.5 to  
20.5 VDC. The sending device determines the class of the PD  
by monitoring the amount of current drawn by the PD during  
this phase. For classes 1, 2 and 3, the classification current (ICL),  
is programmed by resistor R34, as per the table.  
Design Highlights  
Simple interface for Power Over Ethernet (PoE) Powered  
Devices (PDs)  
Includes PoE detection and classification circuits for all  
classes (0, 1, 2 and 3)  
Compliance to IEEE802.3af PoE standards verified by  
University of New Hampshire Interopability Consortium  
(UNH-IOC)*  
POUT  
POUT  
ICL  
ICL  
Class  
R34  
(min)  
(max)  
(min)  
(max)  
W
W
mA  
0.5  
9
mA  
4
Ohms  
-
Includes under voltage lockout (42 VDC on, 34 VDC off)  
0
1
2
3
0.44  
0.44  
3.84  
6.49  
12.95  
3.84  
6.49  
12.95  
PoE Detection and Classification  
12  
20  
30  
133  
69.8  
45.3  
17  
26  
PoE is becoming widely adopted for networking and VoIP  
telecom applications. A typical PD solution is shown in  
Figure 1 and has a PoE interface circuit and a DPA-Switch  
DC-DC converter block (see EPR-68 for full details of  
operation of the DC-DC converter).  
Components R32, R33, R34, R35, Q31, Q32, Q33, Q34, VR31  
and U31 are not installed for Class 0 applications, and the  
classification current is programmed by R31 (24.9 k).  
The PoE specification requires the PD to implement  
three functions: detection, classification and pass-switch  
connection.  
Operation  
ResistorR31providesthedetectionimpedance.Inordertoallow  
correct operation over the detection voltage range, Zener diode  
Detection occurs as the input voltages rises from 2.5 to  
10 VDC. Resistor R31 within the PD presents the detection  
impedance to the PSE.  
C4  
1000 pF R7  
1500 V 10 k  
Ethernet  
(RJ-45)  
L1  
10 µH  
1 A  
C10  
1 µF  
10 V  
C8  
330 µF  
6 V  
C7  
330 µF  
6 V  
D1  
D101  
L2  
PoE Interface  
J2-1  
SL42  
Connector  
DL4002  
1 µH, 2 A  
3.3 V, 2 A  
1
2
3
9,10  
(1,2)  
+
C9  
330 µF  
6 V  
R5  
649 kΩ  
1%  
DL4002  
D102  
6,7  
4
R31  
24.9 kΩ  
1%  
VR31  
11 V  
R36  
R4  
1 MΩ  
1%  
J2-2  
RTN  
51 kΩ  
VR3  
SMAJ  
150A  
D103  
DL4002  
D2  
BAV21  
C11  
1 µF  
50 V  
R32  
100 k  
R11  
1 kΩ  
(4,5)  
5
C1  
1.5 µF  
100 V  
C2  
1.5 µF  
100 V  
Q32  
R10  
R12  
34 kΩ  
1%  
75 Ω  
DL4002  
D104  
R21  
10 kΩ  
R23  
174 kΩ  
1%  
DPA-Switch  
U1  
DPA423G  
U2  
VR32  
27 V  
PC357  
N1TA  
D105  
DL4002  
Q20  
MMBTS  
3906  
R33  
2 kΩ  
1%  
Q31  
D
S
L
R22  
10 kΩ  
CONTROL  
(3,6)  
(7,8)  
C
R37  
220 kΩ  
C13  
0.1 µF  
X
F
DL4002  
D106  
Q33  
R9  
R35  
100 kΩ  
51 Ω  
C5  
U31  
1%  
0.1 µF  
U3  
CAT431L  
D107  
DL4002  
Q34  
R34  
69.8 Ω  
1%  
R6  
C6  
R13  
C12  
0.33 µF  
VR33  
15 V  
8.66 kΩ  
22 µF  
10 V  
20.0 kΩ  
1%  
1%  
Q35  
PI-4042-111005  
100 V  
DL4002  
D108  
0.250 mΩ  
Figure 1. PoE Interface Circuit – Class 2.  
*UNH-IOC test reports are available on the PI website www.powerint.com/poe  
November 2005  
DI-88  
www.powerint.com  

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