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pem31 00 series by 30w power over ethernet plus (poe+) pd module www.poweredethernet.com pem3100_13 f _r1 - 1 page 1 of 13 product overview the pem3100 series of power over ethernet powered device (pd) power extraction modules, have complete compliance with the high power ieee 802.3at power - over - ethernet plus (poe+) standard, and are designed to extract power from cat5 ethernet cable when sour ced by both ieee 802.3at(poe+) and ieee 802.3af (poe) compliant power sourcing equipments (pse). the pem3100 series modules provide full two event poe+ and single event poe signature for layer 1 classification and supports layer 2 classification via an at detect pin. its high efficiency dc - dc converter provides up to 30 watts of power in a well regulated, low noise and low ripple output with in - built in - rush current, overload and output short - circuit protection. the pem3100 series provides a quick, easy, and cost effective method for manufacturers of ethernet equipment like ptz cameras, wimax tower and access points, wireless n, rfid readers, pos terminals, thin client terminals, and ip telephones to poe enable their equipment. product features ? fully ieee 802.3at and 802.3af compliant ? up to 30watt output load 1 ? ieee power class 4 ? high efficiency ? compact package horizontal mounting ? minimal external components required ? cost effective ? ?t detect?pin for layer 2 classification 1 30watt peak for maximum 3 0sec . at duty cycle of 10 % . please see section f. 9 . thermal profile on operating temperature . ? 1500 volt dc isolation (input to output) ? overload protection 2 ? continuous short circuit protection ? low output ripple and noise ? 12v, 18v and 24v dc output voltage models ? adjustable output voltage ? support for external aux. power supply ? rohs 2002/95/ec compliant 2 if maximum power is exceeded, the pem31 00 will operate in an over current mode and will auto recover when the over load condition is removed.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 2 of 13 table of contents product ov rvi w ................................ ................................ ................................ ............ error! boo mar not defined. product f atur s ................................ ................................ ................................ ............. error! boo mar not defined. product s l ctor ................................ ................................ ................................ ................................ ................................ .. 3 absolut maximum rat ings , ................................ ................................ ................................ ................................ ............... 3 input charact ristic s ................................ ................................ ................................ ................................ .......................... 3 dc outpu t charact ristics ................................ ................................ ................................ ................................ .................. 3 pin d scription ................................ ................................ ................................ ................................ ................................ ...... 4 functional d scripti on ................................ ................................ ................................ ................................ ....................... 5 p art f.1. C i nputs ................................ ................................ ................................ ................................ ................................ ............ 5 p art f.2. C m odes of o peration ................................ ................................ ................................ ................................ ....................... 5 p art f.3. C p owere d d evice (pd) s ignature ................................ ................................ ................................ ................................ ...... 6 p art f.4. C ieee poe p ower c lassification m ethod ................................ ................................ ................................ .......................... 6 p art f.5. C at d etection (atd p in ) ................................ ................................ ................................ ................................ ................... 7 p art f.6. C r emote s hutdown (rsd) ................................ ................................ ................................ ................................ ................ 7 p art f.7. C i solation ................................ ................................ ................................ ................................ ................................ ........ 8 p art f.8. C o utput v oltage a djustment ................................ ................................ ................................ ................................ ........... 8 p art f.8.1. C pem3100 o utput v oltage a djustment C r eference c hart ................................ ................................ ........................... 9 th rmal profil ................................ ................................ ................................ ................................ ................................ .. 10 p art f.9. C h eat g eneration ................................ ................................ ................................ ................................ .......................... 10 h at sink ................................ ................................ ................................ ................................ ................................ ............... 11 application not s ................................ ................................ ................................ ................................ ............................... 12 applicatio n ar as ................................ ................................ ................................ ................................ ............................... 12 table of figures figure 1 block diagram and typical connections ................................ ................................ ................................ ........ 4 figure 2 typical system configuration ................................ ................................ ................................ ......................... 5 figure 3 poe power - on start - up waveform ................................ ................................ ................................ .................. 6 figure 4 atd pin connection ................................ ................................ ................................ ................................ ........ 7 figure 5 remote shut down connection ................................ ................................ ................................ ...................... 8 figure 9 thermal performance profile at nominal v in ................................ ................................ ................................ .. 10 figure 10 physical package ................................ ................................ ................................ ................................ ........ 11 figure 11 sample poe system configuration ................................ ................................ ................................ ............. 12
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 3 of 13 product selector part number marking output voltage 3 efficiency 4 ieee power classification output power (maximum) 5 (volts dc) (%) (watts) pem31 12 12 12 85 fixed class 4 24 watts continuous / 30 watts peak pem31 18 18 18 85 fixed class 4 24 watts continuous / 30 watts peak pem31 24 24 24 85 fixed class 4 24 watts continuous / 30 watts peak absolute maximum ratings 6 , 7 supply voltage (v cc ) 0v ~ 57v dc storage temperature (t s ) - 25 o c ~ + 100 o c output voltage (v out ) 0v to controlled output voltage (operating or non - operating) input characteristics parameter symbol units min. typ max. input voltage (dc) 8 v in v 36 51 57 under voltage lockout (dc) v uvlo v 30 36 input current (dc) 9 i in ma 1 0 0 8 , 10 600 maximum inrush current 10 i pk ma 650 operating temperature 6 t op o c - 20 25 70 ieee 802.3at/af power classification 11 fixed class 4 dc output characteristics parameter symbol units min typ max. line regulation 9 v lnrg 0.2% load regulation 9 v ldrg 0.5% output ripple and noise 4,9 v rip mvp - p 1 50 isolation voltage (dc) v isol v 1500 temperature coefficient (slope) tc ppm/ o c 100 300 output short circuit duration sec 3 output voltage typical 3% at t a for 25 o c with a nominal input voltage and rated output current. 4 at nominal vin at 67% load. 5 30watt peak for maximum 30sec. at duty cycle of 10%. please see section f.9 . thermal profile on operating temperature. 6 all specification s typical are at t a of 25 o c 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. 7 exceeding the absolute maximum rating may cause permanent damage to the product. we do not imply functional operation under t hese conditions. thi s rating assumes free air flow. 8 ensure minimum output load of 1 watt or 100ma input current whichever is higher . 9 please refer to ieee802.3a t/af standards document. maximum input current is dependent on power class, and input voltage. input current (dc or rms) at v port =37vdc is 600 ma, at v port =57vdc is 45 0ma. peak inrush current is 650 ma for 50ms max at duty cycle of 5% max. 10 minimum current re quired to maintain power signature as per ieee802.3af / at standards. 11 please see section f.4. - ieee poe power classification method , for more details.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 4 of 13 figure 1 block diagram and typical connections i n p u t i n p u t i e e e 8 0 2 . 3 a t / a f s i g n a t u r e a n d c o n t r o l d c o u t p u t v i n + + v d c - v d c a d j c 1 4 7 0 u f l o w e s r + + v d c - v d c v i n - + - ~ ~ ~ ~ ~ ~ ~ ~ - + d c - d c c o n v e r t e r ( o p t i o n a l ) c 4 - s a f e t y c a p a c i t o r ( f o r e m i t u n i n g ) s m a j 5 8 a ( e s d p r o t e c t i o n ) e c p c p r c 2 4 7 0 u f l o w e s r + e m i e m o ( o p t i o n a l ) c 3 - s a f e t y c a p a c i t o r ( f o r e m i t u n i n g ) a t d r s d p e m 3 1 0 0 figure 1 pin description input pins output pins 1 emi. this pin can be used for additional and improved emi filtration. connect this pin only to emo pin using safety capacitor. 8 +vdc. this pin provides the regulated output from the dc/dc converter. (internally connected to pin 9 ). 2 vin+ . this pin connects to the positive (+) output of the input bridge rectifiers 9 . +vdc. this pin provides the regulated output from the dc/dc converter. (internally connected to pin 8 ). 3 vin - . this pin connects to the negative ( - ) output o f the input bridge. 10 emo. this pin can be used for additional and improved emi filtration. connect this pin only to emi pin using safety capacitor 4 atd. at detect pin. p lease see section f. 5. 1 1 oadj. the output voltage can be adjusted from its nominal value . please see section f.8 . 5 rsd. this pin can be used for remotely shutting down the module from the target device. please see section f.6. 1 2 - vdc . the ground return for the +vdc output. (internally connected to pin 13 ). 6 nc 1 3 - vdc . the ground return for the +vdc output. (internally connected to pin 1 2 ). 7 cpr. remote shut down pin. 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.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 5 of 13 functional description part f. 1. inputs the pem31 00 series is compa tible with all ieee 802.3af / at 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. (refer to ieee802.3at and ieee802.3af standards for more inform ation). pem31 00 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 wants to use only one pem3 1 00 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 p e m 3 1 0 0 p o e p s e d c o u t p u t v i n + v i n - + / - + / - p o w e r e d d e v i c e ( p d ) i e e e 8 0 2 . 3 a t / a f c o m p l i a n t p o w e r s o u r c i n g e q u i p m e n t ( p s e ) r x t x t x r x 4 5 1 2 3 7 8 4 5 1 2 3 7 8 + - + v d c - v d c + - ~ ~ + - ~ ~ 6 6 s p a r e p a i r s p a r e p a i r d a t a / s i g n a l p a i r d a t a / s i g n a l p a i r figure 2 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. in 4 pair injection both signal and spare pairs carries power simultaneously. pem3100 supports only mode a and mode b. part f.2. modes of operation the pem31 00 has five operating modes: reset ? signature detection ? classification ? idle ? on 1. reset all pem31 00 blocks are disabled 2. detection the pem31 00 presents a valid poe pd response to a detection request from an ieee compliant pse. 3. classification pem31 00 pd section indicates power requirements to the pse via a single - event classification for ieee 802.af or a 2 - event physical layer (layer 1) classification for ieee 802.3at. 4. idle the pem31 00 enters this state after classification, and remains until full - power input voltage is applied. 5. on the pem31 00 pd is enabled, and supplies power to the dc - dc controller a nd the local application circuitry.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 6 of 13 part f.3. powered device (pd) signature when pem31 00 is connected to a cat 5e or greater eth ernet cable from an ieee 802.3af /at 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. figure 3 poe power - on start - up waveform 2 . 7 v 7 v 1 0 . 0 v 1 4 . 5 v 2 0 . 5 v 3 7 v 4 2 v 5 7 v r e s e t s i g n a t u r e c l a s s i f i c a t i o n i n t e r m e d i a t e i d l e t u r n o n o n o n r a n g e 4 1 - 5 7 v ( a t ) 4 2 v t i m e v o l t a g e c l a s s e v e n t 2 c l a s s e v e n t 1 s i g n a t u r e r a n g e v 1 v 2 2 . 7 1 0 . 1 v 1 4 . 5 2 0 . 5 v c l a s s i f i c a t i o n r a n g e m a r k r a n g e 6 . 9 - 1 0 v i e e e 8 0 2 . 3 a f s t a r t u p i e e e 8 0 2 . 3 a t s t a r t u p 3 7 - 5 7 v ( a f ) figure 3 part f.4 . ieee poe power classification method with the growing emphasis on ?reen power , in the latest standard, ieee has stressed for powered devices (pds) to implement the ieee 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 and 802.3at standards provide for pds to inform the pse their required power levels via a class system. each class represents a power allocation range for a pd to inform and therefore assist the pse in managing power distribution. the power classes are defined as per table 1 on the next page. the pem31 0 0 supports 2 - event layer 1 (physical layer ) classification, as per ieee802.3at, as shown in figure 3, above. for layer 2 (link layer) classification please see section f.5 at detection. the pem31 00 identifies the pse as either type 1 (15.4w) or type 2 (33.6w). if the 2 - event method is detected by the pd control ler during the classification stage, it asserts the atd pin high, indicating connection to a type 2 pse. if the pd controller detects only single - event classification, it identifies the pse to be type 1 and the atd pin is asserted low. to prevent false positives due to noise or transient ringing on the ethernet line during the classification phase, the pem3000 integrates a proprietary digital filter for ensuring reliable at detection.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 7 of 13 part f.5 . at detection (atd pin) in case of layer 2 (link layer) c la ssification, in order to extract more than 15.4w power from the pse the host board controller has to confirm back to the pse through the data link layer (layer 2) that it is a type - 2 pd. full details are available in the ieee 802.3at standards document. atd pin can be connected to host board through an opto - coupler as shown in figure 4. the opto - coupler (u1) is connected across the isolation barrier. when a type - 2 pse is connected to the pem31 00, the atd pin goes high and turns on the opto - coupler. the collector pin of u1 to be connected to the host board controller, using a pull - up resistor. when the atd pin goes high, u1 output goes low. then the host board controller can understand that the pse can deliver more tha n 15.4w and confirm back that this is a type - 2 pd. if the pem31 00 detects a 1 event physical layer classification, u1 remains off and the output collector remains high (via pull - up resistor). the host board then understands that the pse is not type - 2. in case the physical layer classification is not supported by the pse, then u1 remains off. figure 4 atd pin connection a t d e t e c t + v d c - v d c v i n - t o h o s t b o a r d c o n t r o l l e r 4 7 0 u f c 1 c 2 4 7 0 u f r 1 i s o l a t i o n u 1 l t v 3 5 7 o r p c 8 1 7 o r e q u i v a l e n t p e m 3 1 0 0 figure 4 part f.6 . remote shut down (rsd) the pem31 00 series is featured with remote shut down option, which can be used in case the host board need to shut down pem31 00. this feature is helpful with host boards having auxiliary power supply. using the remote shut down feature the designer can decide the priority of poe power or auxiliary power. for example, when the auxiliary power supply is live, the host board can shut down the pem31 00 output. similarly the rsd feature can be used to initia te a hardware reset. the rsd pin can be connected to host board through an opto - coupler as shown in f igure 5. the opto - coupler is required in order to maintain the 1500v isolation barrier. to shut down the pem31 00 the host board needs to pull the rsd p in from zero to high. when the rsd pin is activated, the output of the pem31 00 will switch off. rsd is a current - mode pin, the ratings are as per table 2 below.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 8 of 13 if the remote shut down feature is not used, connect rsd to vin - . table 2: remote shut dow n description unit min typ max rsd pin threshold low ua 20 rsd pin threshold high ua 100 input voltage rsd pin v 6 figure 5 remote shut down connection r s d + v d c - v d c c p r v i n - t o h o s t b o a r d c o n t r o l l e r 4 7 0 u f c 1 c 2 4 7 0 u f r 1 i s o l a t i o n u 1 l t v 3 5 7 o r p c 8 1 7 o r e q u i v a l e n t p e m 3 1 0 0 figure 5 if rsd is asserted, the atdet pin is forced high, irrespective of the pd mode. please see table 3 below for atdet output definitions under various powering modes. table 3: atdet truth table atdet signal status pse type 1 type 2 rsd = low low high rsd = high high high please contact infomart technical support for more details. part f.7. isolation ieee 802.3af / at 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 pem31 00 modules meet or exceed 1500v impulse test. this is also referred to as hi pot test, flash tested, ?ithstand voltage? ?roof voltage? ?ielectric withstand voltage?& ?solation test voltage? part f. 8 . output voltage adjustment t he pem3000 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 . the resistor to be connected between the oadj pin and either the +vdc or vdc pin as per figure 6 ~8 below. only one connection i.e. between oadj and +vdc o r between oadj and vdc is permitted at a time . a change of more than 10% or 1.5v whichever is lower , from nominal voltage is not permitted. ( pem 31 24 24.5v max). please contact infomart technical support for more details or specific resistor values.
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 9 of 13 part f.8.1. pem31 00 output voltage adjustment reference chart figure 6 figure 7 10.5 11 11.5 12 12.5 13 13.5 0 100 200 300 400 500 600 700 800 900 1,000 1,100 1,200 1,300 1,400 1,500 output voltage vdc resistance kohm (approx) PEM3112 output voltage adjustment oadj to -vdc oadj to +vdc 16.5 17 17.5 18 18.5 19 19.5 0 100 200 300 400 500 600 700 800 900 1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 1,800 1,900 2,000 output voltage vdc resistance kohm (approx) pem3118 output voltage adjustment oadj to -vdc oadj to +vdc
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 10 of 13 figure 8 thermal profile part f.9. heat generation as with any power component, the pem31 00 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 pem31 00 will depend on the output load it is required to drive. the maximum ambient operat ing temperature is 70 o c. figure 9 below, shows the thermal performance of the pem31 00 with a nominal 51vdc input. figure 9 thermal performance profile at nominal v in figure 9 22.5 22.7 22.9 23.1 23.3 23.5 23.7 23.9 24.1 24.3 24.5 0 400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000 4,400 4,800 5,200 5,600 6,000 output voltage vdc resistance kohm (approx) pem3124 output voltage adjustment oadj to -vdc oadj to +vdc 0 3 6 9 12 15 18 21 24 27 30 33 -20 -10 0 10 20 30 40 50 60 70 80 o-tp-t power (was) ambient temperat-re ( o c) p m3100 continuous pea
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 11 of 13 heat sink the pem31 00 thermal performance can be improved by forced airflow cooling over the module and by using (a) a n external heat sink o r (b) a pow er plane heat sink. the two methods can be combined. the pem3100 provides two locations, one each on input and output for addition of an external heat sink. please see figure 10 fo r details. a power plane heat sink on the motherboard is a relatively simple method to draw some heat away from the pem31 00 . pins 12 and 13 ( - vdc output pins ) can be connected to a heat sink on the motherboard pcb . it is important to maintain electrical isolation mutually between the oadj pin, the emo pin, the +vdc pin, and the - vdc pin in order to ensure proper output voltages. these power plane heat sinks must be on the outer layers of the pcb. for better heat dissipation always solder the pem31 00 on the power plane; do n o t use sockets. sockets can also generate voltage spikes. th ese method s can be combined with forced airflow cooling, and for extreme cases with a n additional heat sink glued on to the main transformer using thermal glue. figure 10 physical package all dimensions in mm and nominal unless stated otherwise c o m p o n e n t s p e m 3 1 0 0 3 . 5 0 3 . 5 0 6 8 . 0 0 3 0 . 0 0 1 5 . 2 8 3 . 5 0 3 . 5 0 6 . 0 0 2 1 . 3 0 4 7 . 5 0 5 . 0 0 2 4 . 5 0 8 . 6 5 2 . 5 4 1 2 . 7 4 2 . 5 4 4 . 7 0 8 . 6 0 8 . 7 0 1 5 . 5 0 8 . 7 0 ? 3 . 0 0 ? 7 . 0 0 k e e p o u t a r e a . 1 5 0 0 v i s o l a t i o n b a r r i e r s c r e w h o l e f o r m o u n t i n g s c r e w h o l e f o r m o u n t i n g a n d a d d i n g a d d i t i o n a l h e a t s i n k i n g 0 . 6 0 r e c o m m e n d e d p c b l a y o u t 2 . 5 4 1 . 1 1 . 4 5 1 . 4 5 1 . 4 5 2 . 5 4 3 . 0 0 1 . 6 0 1 1 . 5 0 t o p v i e w 1 7 8 1 3 1 9 . 1 4 m a x figure 10
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 12 of 13 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, rathe r 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 ieee802.3at and ieee802.3af. compliance with this standard ensures inter - operability between devices. the pem31 00 series modules offering a modular solution, incorporating layer - 1 ieee802.3at / af compatibility signature to the pse and isolated on - board dc/dc converter. the pem31 00 series are ideal modular system blocks allowing manufacturers of ethernet equipment to poe enable their equipment with minimal effort and cost. the pem31 00 modules series offer simple and quicker product development, maximising return on inv estment. pem31 00 can be powered using a user designed power supply which has adequate thermal and over - current protection. it is strongly recommended that only ieee802.3at / af compliant power supply equipment be used to prevent damage to the module, whi ch 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 (bi - directional) tvs diode at the pem3100 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 ? rem ote environmental monitoring figure 11 sample poe system configuration figure 11
pem3100 series by 30w power over ethernet plus (poe+) pd module www.po weredethernet.com pem3100_13 f _r1 - 1 page 13 of 13 infomart india pvt. ltd. infomart technologies infomart tech park 99, 5 th cross, 5 th block, koramangala bangalore 560 095, india tel : +91 80 4111 - 7200 5904, south cooper st. ste. 104 - 96 arlington, texas, 76017 usa tel : +1 (682) 234 - 4600 email: pesales@infomartgroup.com 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 specificatio n for your product before use. infomart ind a pvt. 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, photo graphic, photocopy, magnetic or other recording means, without prior writt en permission from infomart ind a pvt. ltd. infomart is a registered trademark of infomart (india) pvt. ltd. poweredethernet is a trademark of infomart (india) pvt. ltd.

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