PEM1200 SERIES by Power Over Ethernet PD Module PRODUCT SELECTOR Nominal Output Power 4 Efficiency 3 6,7 Input Voltage Voltage (Maximum) Part Number Marking (Volts DC) (Volts DC) (%) (Watts) PEM1203 3 48 3.3 80 10 PEM1205 5 48 5 82 12.95 PEM1212 12 48 12 86 12.95 5 6 ABSOLUTE MAXIMUM RATINGS , Supply Voltage (V ) 0V 57V DC CC O O PRODUCT OVERVIEW Storage Temperature (TS) -25 C 100 C The PEM1200 series of power extraction Output Voltage (VOUT) 0V to controlled output voltage (operating or non-operating) modules, have complete compliance with the IEEE 802.3af Power-Over-Ethernet (PoE) INPUT CHARACTERISTICS standard, and are designed to extract power from 4 CAT5 Ethernet cable when sourced by a IEEE Parameter Symbol Min. Typ . Max. Units 802.3af compliant Power Sourcing Equipment 7 Input Voltage V 36 48 57 Volts IN (PSE). Under Voltage Lockout VUVLO 30 36 Volts With the increasing demand for Green Power 8 10 Input Current , IIN 350 400 mA IEEE has emphasized the need for power right- s izing . The PEM1200 series Powered Device 9 O Operating Temperature T -20 25 70 C OP (PD) modules provides full PoE signature and 10 IEEE 802.3af Power Classification Programmable Class 0, 1, 2, or 3 programmable power classification for granular power management. DC OUTPUT CHARACTERISTICS Its high efficiency DC-DC converter provides a 4 Parameter Symbol Min. Typ . Max. Units well regulated low noise and low ripple output with in-built overload and output short-circuit 8 Line Regulation V 0.2% LNRG protection. 8 Load Regulation VLDRG 0.5% The PEM1200 series provides a quick, easy, and 5, 8 Output Ripple and Noise VRIP 80 mV p-p low cost method for Ethernet equipment Isolation Voltage V 1500 V DC manufacturers to PoE enable their equipment. ISOL O Temperature Coefficient (Slope) TC 100 300 ppm C PRODUCT FEATURES Fully IEEE 802.3af compliant 1 Figure 1 - BLOCK DIAGRAM and TYPICAL CONNECTIONS 12.95 watt output load CP1 IEEE Power class programmable (Green) ADJ PEM1200 ~ CP2 ~ 1500 Volt DC isolation (Input to Output) +VDC Input + - +VDC 3.3V, 5V, 12V DC output voltage models VIN+ ~ ~ IEEE Compact package minimum PCB footprint DC 802.3af ~ + DC-DC ~ Output Signature C1 Converter Minimal external components required Input - + and 470uF 2 Control Low ESR Overload and short circuit protection ~ ~ VIN- -VDC -VDC Wide input voltage (36V to 57V DC) Adjustable output voltage RoHS 2002/95/EC compliant (Optional) C2 Safety Capacitor (for EMI tuning) Low output ripple and noise Low cost 3 0 Output voltage typical 3% at T of 25 C with a nominal input voltage and rated output current. A 4 At nominal Vin at 67% load 5 0 All specifications typical are at T of 25 C with a nominal input voltage and rated output current A 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 With minimum load 100mA 8 Please refer to IEEE802.3af standards document. Maximum input current is dependent on power 1 class, and input voltage. Input current (DC or RMS) at V =37vDC is 350mA, at V =57vDC is PORT PORT In 5V and 12V model 230mA. Peak inrush current is 400mA for 50mS max at duty cycle of 5% max. 2 If maximum power is exceeded, the PEM1200 will 9 Please see section F.6. Thermal profile on operating temperature operate in over current mode and will auto recover 10 Please see section F.2 Powered Device Signature and Class programming for more details when the over load condition is removed. www.poweredethernet.com PEM1200 11G R0-8 (DRAFT) Page 1 of 5 SMAJ58A (ESD Protection) PEM1200 SERIES by Power Over Ethernet PD Module FUNCTIONAL DESCRIPTION F.1. Inputs The PEM1200 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 PEM1200 provides for external input bridge rectifiers for improved system design flexibility, and distribution of heat generation. As an example, a system designer wanting to provide two RJ45 inputs, both of which are PoE enabled, but use only one PEM1200 module to save costs. Another advantage is that this allows the system designer to control the type and costs of the input rectification diodes. 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. POWERED DEVICE (PD) IEEE 802.3af COMPLIANT POWER 4 4 SOURCING EQUIPMENT (PSE) + 5 5 SPARE PAIR +/- 1 1 ~ TX RX - + VIN+ +VDC 2 DATA / 2 ~ ~ SIGNAL PAIR DC PSE - + PEM1200 OUTPUT (48V) ~ 3 3 VIN- -VDC RX TX 6 6 DATA / SIGNAL PAIR +/- 7 7 - 8 8 SPARE PAIR F.2. Powered Device (PD) Signature and Power Classification When the PEM1200 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 PEM1200 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 1/16W or greater and 1% tolerance resistor between PoE Power Class Required PD Power Pin 4 (Vin ) and Pin 6 (CP2) Pin 5 (CP1) and Pin 6 (CP2) 0 0.44W ~ 12.95W Do not connect Any value 10K to 100 K 1 0.44W ~ 3.84W 280k Do not connect 2 3.84W ~ 6.49W 143k Do not connect 3 6.49W ~ 12.95W 90k9k Do not connect 4 Reserved for 802.3at Reserved Reserved Important : Do not connect Pin 4 to Pin 5 at any time. Do not connect Pins 4 and 5 and 6 at the same time. Connect Pin 5 only to Pin 6 and only as per 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. Infomarts PoweredEthernet PEM1200 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. www.poweredethernet.com PEM1200 11G R0-8 (DRAFT) Page 2 of 5