ETC PEM1305

PEM1300 SERIES
by
Power Over Ethernet PD Module
PRODUCT SELECTOR
Part Number
Marking
Nominal
Input Voltage
(Volts DC)
Output
Voltage3
(Volts DC)
(%)
Power
(Maximum) 6,7
(Watts)
PEM1303
3
48
3.3
80
10
PEM1305
5
48
5
81
12.95
PEM1312
12
48
12
84
12.95
Efficiency4
5 6
ABSOLUTE MAXIMUM RATINGS ,
PRODUCT OVERVIEW
The PEM1300 series of power extraction
modules, have complete compliance with the
IEEE 802.3af Power-Over-Ethernet (PoE)
standard, and are designed to extract power from
CAT5 Ethernet cable when sourced by a IEEE
802.3af compliant Power Sourcing Equipment
(PSE).
Supply Voltage (VCC)
0V – 57V DC
Storage Temperature (TS)
-25 OC – 100 OC
Output Voltage (VOUT)
0V to controlled output voltage (operating or non-operating)
INPUT CHARACTERISTICS
Parameter
With the increasing demand for “Green Power”
IEEE has emphasized the need for power “rightsizing”. The PEM1300 series Powered Device
(PD) modules provides full PoE signature and
programmable power classification for granular
power management.
Input
Symbol
Min.
Typ4.
Max.
Units
48
57
Volts
36
Volts
350
400
mA
25
70
OC
VIN
36
Under Voltage Lockout
VUVLO
30
Current8,10
IIN
Input
Voltage7
Operating
Temperature9
TOP
Its high efficiency DC-DC converter provides a
well regulated low noise and low ripple output
with in-built overload and output short-circuit
protection.
IEEE 802.3af Power Classification10
The PEM1300 series provides a quick, easy, and
low cost method for Ethernet equipment
manufacturers to “PoE enable” their equipment.
Line Regulation8
-20
Programmable Class 0, 1, 2, or 3
DC OUTPUT CHARACTERISTICS
Parameter
Symbol
Load Regulation8
Output Ripple and
PRODUCT FEATURES
Noise5, 8
Isolation Voltage
 Fully IEEE 802.3af compliant
 12.95 watt output load1
 IEEE Power class programmable (Green)
 1500 Volt DC isolation (Input to Output)
 3.3V, 5V, 12V DC output voltage models
 Compact package minimum PCB footprint
 Minimal external components required
 Overload and short circuit protection2
 Wide input voltage (36V to 57V DC)
 Adjustable output voltage
 RoHS 2002/95/EC compliant
 Low output ripple and noise
 Low cost
Min.
Typ4.
VLNRG
0.2%
VLDRG
0.5%
VRIP
80
VISOL
Temperature Coefficient (Slope)
TC
100
Max.
Units
mV p-p
1500
V DC
300
ppm OC
Figure 1 - BLOCK DIAGRAM and TYPICAL CONNECTIONS
VINA+
~
-
Input
-
Input
~
ADJ
+VDC
+
+VDC
~
~
~
VINB-
PEM1300
~
~
+
~
IEEE
802.3af
Signature
and
Control
DC-DC
Converter
DC
Output
-VDC
CP1
+
C1
470uF
Low ESR
-VDC
CP2
(Optional) C2 – Safety Capacitor (for EMI tuning)
3
4
Output voltage typical ± 3% at TA of 250C with a nominal input voltage and rated output current.
At nominal Vin at 67% load
5
All specifications typical are at TA of 250C with a nominal input voltage and rated output current
unless otherwise noted. These are meant as a design aid only and are indicative, and not guaranteed.
6
Exceeding the absolute maximum ratings may cause permanent damage to the product. We do not
imply functional operation under these conditions. These ratings assume free air flow.
7
8
1
In 5V and 12V model
2
If maximum power is exceeded, the PEM1300 will
operate in over current mode and will auto recover when
the over load condition is removed.
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9
With minimum load 100mA
Please refer to IEEE802.3af standards document. Maximum input current is dependent on power
class, and input voltage. Input current (DC or RMS) at VPORT =37vDC is 350mA, at VPORT =57vDC is
230mA. Peak inrush current is 400mA for 50mS max at duty cycle of 5% max.
Please see section F.6. – Thermal profile on operating temperature
10
Please see section F.2 – Powered Device Signature and Class programming for more details
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PEM1300 SERIES
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Power Over Ethernet PD Module
FUNCTIONAL DESCRIPTION
F.1. Inputs
The PEM1300 is compatible with all IEEE 802.3af compliant Power Sourcing Equipment (PSE) and supports the different power injection options of
Data/Signal pair (Mode A) or Spare Pair (Mode B). See Figure 2 – Typical System Configuration. As per IEEE 802.3af, it is specified that the PSE does not
apply power to the both outputs at the same time i.e. 4 pair injection. (Refer to IEEE802.3af standards for more information).
The PEM1300 provides onboard input bridge rectifiers for improved system integration and minimal external components.
Figure 2 – Typical System Configuration
In Mode A – Signal Pair injection, the signal lines carry both data and power. In Mode B – Spare Pair injection, the Signal pair carries only data, and the spare
pair carries power.
IEEE 802.3af COMPLIANT POWER
SOURCING EQUIPMENT (PSE)
4
4
POWERED DEVICE (PD)
+
5 SPARE PAIR 5
+/1
1
TX
~
RX
2
PSE
(48V)
2
DATA /
SIGNAL PAIR
3
~
-
+
~
+
~
3
RX
-
+VDC
PEM1300 DC
OUTPUT
-VDC
TX
+/-
6
6
DATA /
SIGNAL PAIR
7
7
8 SPARE PAIR 8
F.2. Powered Device (PD) Signature and Power Classification
When the PEM1300 is connected to a Cat 5e or greater Ethernet cable from an IEEE 802.3af compliant Power Sourcing Equipment (PSE), Endspan or
Midspan, it will automatically present a Powered Device (PD) signature to the PSE, as and when requested. The PSE will then recognise that a PD is
connected to that line and supply power.
With the growing emphasis on “Green Power”, in the latest standard, IEEE has stressed for PDs to implement the IEEE 802.3af Power Classification
system to ensure correct provisioning of power from the PSE. To help in proper power level provisioning and improved power management, the IEEE 802.3af
standard provides for PDs to inform the PSE their required power levels via a Class system. The classes are defined as per Table 1 below. The PEM1300
allows for programming the Class by placing a 1/16W or greater and 1% tolerance resistor detailed in Table 1.
Table 1 – Power Classification programming
PoE Power Class
Required PD Power
0
1
2
3
4
0.44W ~ 12.95W
0.44W ~ 3.84W
3.84W ~ 6.49W
6.49W ~ 12.95W
Reserved for 802.3at
1/16W or greater and 1% tolerance resistor between
Pin 4 (VINB –) and Pin 6 (CP2)
Pin 5 (CP1) and Pin 6 (CP2)
Do not connect
Any value 10KΩ to 100 KΩ
280kΩ
Do not connect
143kΩ
Do not connect
90k9kΩ
Do not connect
Reserved
Reserved
Important : Never connect Pin 4 (VINB-) to Pin 5 (CP1). Do not connect Pins 4 (VINB-) and 5 (CP1) and 6 (CP2) at the same time. Connect Pin 5 (CP1) only
to Pin 6 (CP2) and only as per instructions in Table 1. Pin 5 and 6 may be left unconnected for default Class 0 but is not recommended.
F.3. Isolation
IEEE802.3af section 33.4.1 calls for a Powered Device (PD) to meet safety isolation requirement by meeting the electrical strength test of IEC 60950 sub
clause 6.2. Infomart’s® PoweredEthernet™ PEM1300 modules meet or exceed 1500V impulse test. This is also referred to as ‘Hi Pot Test’, ‘Flash Tested’,
‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’.
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PEM1300 SERIES
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Power Over Ethernet PD Module
F.4. Output Voltage Adjustment
The PEM1300 series has an OADJ pin, which allows the output voltage to be increased or decreased from its nominal value using a 1/16W power rating or
greater and 1% tolerance resistor connected between the OADJ pin and either the +VDC or –VDC pin as per figures below. Only one connection i.e. between
OADJ and +VDC or between OADJ and –VDC is permitted at a time. A change of more than ± 10% from nominal is not permitted. Please contact Infomart
technical support for more details or specific resistor values.
Figure 3
Figure 4
Figure 5
F.5. Pin Connections
INPUT PINS
VINA+. This pin connects to Ethernet cable spare pair (for Mode
1
B PoE injection). Not polarity sensitive.
VINA-. This pin connects to Ethernet cable spare pair (for Mode
2
B PoE injection). Not polarity sensitive.
3
VINB+. This pin connects to the output of the data transformer
centre-tap (for Mode A PoE injection). Not polarity sensitive.
5
VINB-. This pin connects to the output of the data transformer
centre-tap (for Mode A PoE injection). Not polarity sensitive.
CP1. Connect this pin only as per instructions in Table 1.
6
CP2. Connect this pin only as per instructions in Table 1.
4
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OUTPUT PINS
-VDC. The ground return for the +VDC output. Max. current 3A per
7
pin.
+VDC. This pin provides the regulated output from the DC/DC
8
converter. Max. current 3A per pin.
OADJ. The output voltage can be adjusted from is nominal value,
9
by connecting an external resistor from this pin to either the +VDC
pin or the -VDC pin. For more details please see section F.4.
10
NC Do not connect
To maintain isolation integrity, always connect respective input and
output poles only via X or Y safety capacitor. Maintain isolation
barrier on motherboard PCB as per physical package.
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PEM1300 SERIES
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Power Over Ethernet PD Module
Figure 6 – PHYSICAL PACKAGE
All dimensions in mm
56 ± 0.5
16.80 ± 0.5
14.00
14.00 ± 0.5
3.50
PEM13XX
9.90
0.60
30.48 ± 0.5
3.00 ± 0.25
RECOMMENDED PC BOARD LAYOUT
2.54 ± 0.25
0.60 ± 0.05
Ø1.1
N
O
TI R
LA IE
O R
IS AR
B
6.90
3.00 ± 0.5
1
33.5 ± 0.25
2.54
THERMAL PROFILE
F.6. Heat Generation
As with any power component, the PEM1300 modules generate heat. It is important that adequate ventilation and airflow be taken into consideration at the design stage. The
quantum of heat generated by the PEM1300 will depend on the output load it is required to drive. The maximum ambient operating temperature is 70OC. Figure 7 below, shows
the thermal performance of the PEM1300 with a nominal 48VDC input. The PEM1300 thermal performance can be improved by forced airflow cooling over the module and by
using a heat sink (a) glued on to the output diodes using a thermal glue, or (b) by a power plane heat sink described in Figure 8 below. The two methods can be combined.
Figure 7 – Thermal Performance profile at nominal Vin
PEM1303
Output Power (Watts)
14
PEM1305
PEM1312
12
10
8
6
4
2
0
-20
-10
0
10
20
30
40
Ambient Temperature (OC)
50
60
70
80
Figure 8 – Power Plane Heat Sink
Power Plane Heat Sink
PEM13XX
-VDC
C1
+VDC
Place C1 close to output pins
A power plane heat sink on the motherboard is a relatively simple method
to draw some heat away from the PEM1300 using the output pins (-VDC
and +VDC) which are connected to a PCB heat sink on the motherboard. It
is important to maintain electrical isolation between OADJ pin and the
+VDC and -VDC pins to ensure proper output voltages.
These power plane heat sinks must be on the outer layers of the PCB and
the PEM1300 must not be fitted into a socket.
This method can be combined with forced airflow cooling, and with a heat
sink glued on to the two output diodes using a thermal glue.
OUTPUT
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PEM1300 SERIES
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Power Over Ethernet PD Module
APPLICATION NOTES
Power Over Ethernet (PoE) is a technology for wired Ethernet, the most widely installed local area network technology in use today. PoE allows the
electrical power necessary for the operation of each end-device to be carried by data cables along with the data, rather than by separate power
cords. Thus, it minimizes the number of wires used to install the network, resulting in lower cost, less downtime, easier maintenance and greater
installation flexibility.
The IEEE standard governing PoE is IEEE802.3af. Compliance with this standard ensures inter-operability between devices.
The PEM1300 series modules offering a modular solution, incorporating full IEEE802.3af compatibility signature to the PSE and isolated on-board
DC/DC converter. The PEM1300 series are ideal modular system blocks allowing manufacturers of Ethernet equipment to “PoE enable” their
equipment with minimal effort and cost. The PEM1300 modules series offer simple and quicker product development, maximising return on
investment.
PEM1300 can be powered using a user designed power supply which has adequate thermal and over-current protection. It is strongly
recommended that only IEEE802.3af compliant power supply equipment be used to prevent damage to the module, which lacks output stage
thermal protection .
ESD Protection: It is required that the system designer must provide ESD protection such as an SMAJ58A (uni-directional) or SMAJ58CA (bidirectional) TVS diode at the PEM1300 input(s) to prevent damage from over-voltage surges and for system EMC compliance.
APPLICATION AREAS










Security and alarm systems
Voice over IP phones
Access control systems
IP Cameras
Displays, Net Monitors
Public address systems
Wireless access points
Environmental control
Telemetry
Remote environmental monitoring
Figure 9 – Sample PoE System Configuration
Infomart Asia Pacific Pte. Ltd.
1, North Bridge Road #19-04
High Street Centre
Singapore 179094
Tel : +65 6225-6500
Infomart Technologies
Americas sales office
Infomart Tech Park
th
th
99, 5 Cross, 5 Block, Koramangala
5904, South Cooper St. #104-96
Bangalore – 560 095, Karnataka
Arlington, Texas, 76017, USA
India
Tel : +1 (682) 234-4600
Tel : +91 80 4111-7200
E-mail : [email protected]
Infomart India Pvt. Ltd.
Infomart® reserves the right to alter or improve the specification, internal design or manufacturing process at any time, without notice. Please check with your distributor
or visit our website to ensure that you have the current and complete specification for your product before use.© Infomart Asia Pacific Pte. Ltd. All rights reserved. This
publication, in full or in part, may not be copied, transmitted or stored in a retrieval system, or reproduced in any way including, but not limited to, magnetic, digital,
photographic, photocopy, magnetic or other recording means, without prior written permission from Infomart Asia Pacific Pte. Ltd. Infomart is a registered trademark of
Infomart® (India) Pvt. Ltd. PoweredEthernet™ is a trademark of Infomart (India) Pvt. Ltd.
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