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v1.0 dec 2006 data sheet silver t e l e c o m 1. features ? ieee802.3af compliant ? small surface mount package siz e ? 32mm (l) x 18mm (w) x 11.5mm (h) ? high efficiency dc/dc converter ? input voltage range 37v to 57v ? overload and short-circuit protection ? adjustable output - 3 product variants cover all voltages from 2.5v to 14v ? thermal cut off ? silver telecom ?design-in? assistance 2. description the AG8100 series of modules are designed to extract power from a c onventional twisted pair category 5 ethernet cable, conforming to the ieee 802.3af power-over-ethernet (poe) standard. the AG8100 signature and control circuit provides the poe compatibilit y signature and power classification required by the power sourcing equipment (pse) before applying up to 15w power to the port. the AG8100 is compat ible with class 0 to class 3 equipment. the high efficiency dc/dc conv erter operates ov er a wide input voltage range and provides a non-isolated regulated low ripple and low nois e output. the dc/dc conv erter also has built-in output overload, output short-circui t and over-temperature protecti on. AG8100 power-over-ethernet module pb pb ? silver tele com 20 06
v1 .0 d e c 20 06 AG8100 data sheet pow e r-o ver-eth ern e t module table of contents 1. features ........................................................................................................................... 1 2. description ....................................................................................................................... 1 table of contents ............................................................................................................. 2 table of figures ............................................................................................................... 2 3. AG8100 product selector ................................................................................................. 3 4. pin desc ription ................................................................................................................. 4 5. functional description ..................................................................................................... 6 5.1. inputs ........................................................................................................................ 6 5.2. pd signature ............................................................................................................. 6 5.3. isolation ..................................................................................................................... 6 5.4. power class ification .................................................................................................. 7 5.5. dc/dc converter ...................................................................................................... 7 5.6. grounding ................................................................................................................. 8 5.7. output adjustment ..................................................................................................... 8 5.8. typical connections .................................................................................................. 9 6. typical application ......................................................................................................... 10 7. typical recommendations ............................................................................................. 11 8. operating temperature range ...................................................................................... 11 9. over-voltage .................................................................................................................. 12 10. electrical characteristics .............................................................................................. 15 10.1. absolute maximum ratings* ................................................................................. 15 10.2. recommended oper ating conditions ................................................................... 15 10.3. dc electrical characteristics* ............................................................................... 15 11. package ....................................................................................................................... 16 table of figures figure 1: block diagram with external com ponents ............................................................ 3 figure 2: AG8100 sm t package format .............................................................................. 5 figure 3: typical syst em diagram ....................................................................................... 6 figure 4: class programming opti on ................................................................................... 7 figure 5: output adjustment ................................................................................................ 8 figure 6: typical connection diagram ................................................................................. 9 figure 7: typical application .............................................................................................. 10 figure 8: typical lay out ..................................................................................................... 11 figure 9: power plane heatsink for AG8100 ...................................................................... 12 figure 10: ag8103 operating profile ................................................................................. 13 figure 11: ag8105 operating profile ................................................................................. 13 figure 12: ag8112 operating profile ................................................................................. 14 ? silver telecom 2006 2
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 3. AG8100 product select or part number nominal output voltage ma ximum output power * marking package a g 8 1 1 2 1 2 . 0 v 1 2 w 1 2 s m t a g 8 1 0 5 5 . 0 v 7 w 5 s m t a g 8 1 0 3 3 . 3 v 5 . 2 5 w 3 s m t *at 25c w i th v in = 48v ? all versions of t he AG8100 a r e r o hs compliant. table 1: ordering information figure 1: block diagram w i th external components ? silver telecom 2006 3
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 4. pin description pin # name description 1 2 3 +vdc positive dc output. these pins provide the positive regulated output from the dc/dc converter. 4 c p class pro g ramming. connectin g an extern al resistor to vin- will change the current class of the modul e. with no resistor fitted the AG8100 will default to class 0. 5 v i n - direct input - . this pin connects to the negative (-) output of the input bridge rectifiers. 6 v i n + direct input + . this pin connects to the positive (+) output of the input bridge rectifiers. 7 8 9 tgnd thermal ground. these pins can be used to dissipate heat from the module. 1 0 a d j output ad just. the output voltage is set by connecting an external resistor from this pin to the +vdc pin. see the output adjustment section for more information. 11 12 -vdc negative dc output. these pins provide the negativ e regulated output from the dc/dc converter. ? silver telecom 2006 4
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 123 45 7 8 9 10 11 12 6 (top view) AG8100 pb lead f r ee silver telecom 1 (b ot tom vie w ) figure 2: AG8100 smt package format ? silver telecom 2006 5
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 5. functional description 5.1. inputs the AG8100 has a single input t hat can be c onnected t o two external brid ge r e ctifiers (see figure 1). this allows the ag810 0 to be compatible with equi pment that use the different power options, see figure 3. it i s important that the pse does n o t apply power to both bridge rectifiers at the same time (ref er to ieee802.3af fo r more information). pse ( 48v ) a g 8 100 dc outp ut vi n+ vi n- +/- +/- p o w e re d de vi ce (p d) p o w e r s o ur ci ng eq u i pm en t ( pse) rx tx tx rx 4 5 1 2 3 6 7 8 4 5 1 2 3 6 7 8 + - vd c + vd c - figure 3: typical system diagram 5.2. p d signature when the ag810 0 is connected to the cat 5e cabl e, it will autom atically pre s ent a powered device (pd) signature to t he power so urcing equipment ( pse) or midspan equipm ent, when requested. the equipment will then recognise that a powe red dev ice is connected t o that line and supply power. 5.3. isolation the ag81 0 0 series conforms to the ieee 8 02. 3af standard exce p t for the 1500v iso l ation, which must be done externally. this is usuall y achieved without additional components, by using a plastic insulat ed enclosure. cont act silver telecom for further details. ? silver telecom 2006 6
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 5.4. p o wer classification this is optional from the pse and is used f o r power m anagement . the AG8100 allows the current class to be externally programmed by connecting a resistor between the cp and vin- pins, see figure 4. if no resist or is fitted the AG8100 will defau lt to class 0, a full list of programming resistor values are shown in t able 2. clas s programming resistance (ohms) min power (w) max power (w) 0 do not fit 0.44 12.95 1 6 9 8 0 . 4 4 3 . 8 4 2 3 8 3 3 . 8 4 6 . 4 9 3 2 4 9 6 . 4 9 1 2 . 9 5 4 t b d r e s e r v e d r e s e r v e d table 2: class progr amming AG8100 cp vin- cla ss prog ra mm ing op t i on rc figure 4: class pro g ramming option 5.5. dc/dc converter the AG8100?s dc/dc converter provides a non- isolated regulated low ripple and low nois e output, that has built -in overload and short-circ uit output protection, as well a built-in thermal cut-off - see table 1: ordering in formation for voltage and power ratings. because the AG8100 series ar e non-isolated the +vdc output is (internally) connected to the vin+ input. ? silver telecom 2006 7
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 5.6. groundi ng if the AG8100 is supplied from a grounded s ource (e.g. a standard multi-c hannel pse) it is important that the ?vdc output is not connected to ground. connecting both input and output to ground will result in a short circuit that will prevent t he AG8100 from operating correctly. 5.7. output a d justmen t the AG8100 output voltage is s e t ex ternally by the ra resistor. if the ra resistor is ope n circuit (o/c) then the output is set to its ma ximum voltage. if the ra res i stor is a s h ort circuit (s/c) then the output will be set to it s minimum voltage. table 3 be lo w shows the output voltage range of each of t he product variants and the valu es of ra r e quired to set the nominal output voltage. figure 5: output adjustment setting the output voltage, connect ra betw een a d j and +vdc a g 8 1 0 3 a g 8 1 0 5 a g 8 1 1 2 r a o u t p u t r a o u t p u t r a o u t p u t o / c 4 . 5 v o / c 7 . 5 v o / c 1 4 . 0 v 5 k 6 3 . 3 v 3 k 5 . 0 v 6 8 k 1 2 . 0 v s / c 2 . 5 v s / c 4 . 5 v s / c 7 . 5 v table 3: output adjustme nt resistor (ra) value *note: the r e sults in table 3 are u nder minimum load conditions ? silver telecom 2006 8
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 5.8. typical connections the AG8100 only requires external bridge r e ct ifiers on its input, the ra resistor and a low cost capacitor on its output (a minimum of 470f is recommended) as shown in figure 6. the value of c1 will be rela ted to the maxim u m load st ep c hange that the output needs t o drive. for example, in an applic ation were the output needs to c ope with a 1.8 amp load step change, a minimum of 1000f should be us ed. this can be a standard low co st electrolytic and does not need to be a low esr type. figure 6 s hows a 16v capac itor that would cover all produc t variants up to and includ ing the ag8112, see table 1: ordering information. the class programming and the out put adjust inputs are optiona l and are provided to give great flexib ility to the ag810 0. further information on using thes e inputs can be found in sections 5.4. power classificati on and 5.7. output adjustment. AG8100 rx tx 4 5 1 2 3 6 7 8 vin+ vin- cp +vdc -vdc adj o u t put rj- 4 5 c1 470f 16 v + ra rc * * optiona l cla s s program ming re si stor figure 6: typical con n ection diagram ? silver telecom 2006 9
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 6. t y pical application the AG8100 can be used in numerous applications . in the example show n in figure 7, the data outputs from the switch are connected to the inputs of a midspan. the midspan will then add power (to the data) on each output that supports po wer over ethernet (poe). in this example port 1 is c onnected to an et hernet camera and port 2 is c onnected t o a wireless ac cess point, both of these devices have a built-in AG8100. when the midspan is switched on (or when the device is connect ed), the midspan will check eac h output for a poe signat ure. on ports 1 and 2 the ag8 100 will id entify themselv es as poe en abled devices and the midspan will supply both data and power to these peripherals. the other ports (shown in this example) wil l not have a poe signature and the midspan will only pass the data through to these periph e ra ls. the midspan will continuo usly monitor each output to see if a poe enabled device has been added or removed. figure 7: typical app lication ? silver telecom 2006 10
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 7. t y pical recommendations figure 8 gives an example of the tracking needed for the a g8100. r1, r2 and r3 are optional components, but c1 needs to be positioned c l ose to the output pins of the AG8100 as possible to minimis e the current loop. the thermal performance of the AG8100 ca n b e improved by increasing the surface area of the track +v dc, -vdc and thermal ground. rc adj cp inpu t from br idge rectifier s vi n- vin+ ra AG8100 1 * heat dissipa tion of t he ag8 100 can be im proved by i n cr e a sing th e su r f ace area of t he + v d c , - v d c a n d thermal grou nd tracks. * * ou tp ut volt age c1 -vd c +v d c figure 8: ty pical layout 8. operating t e mperature range because th e ag810 0 is a power component , it will g e n e rate heat, so it is imp o rtant that this be taken into consideration at the design stage. the heart of the AG8100 is a dc/dc converter, which like any other power supply will generate heat. the amount of h eat generated by the module wi ll depend on the load it is required to drive and the input vo ltage supp li ed by the pse. the information shown with in this section of datasheet is referenced to a nominal 48vdc input voltage supplied by the pse. the AG8100 has a maximum ambient operating temperature of 70 o c s ee figure 10, figure 11 & figure 12. thes e results are in still air witho ut any heatsinking, the performance of the AG8100 c a n be improv ed by fo rcing the airflow over the part or by using a heatsink (see the AG8100 application note on heatsinking for more information). the AG8100 has built-in thermal protection, to prevent the module from being damaged if operated beyond its power / temper ature specification . if the th ermal protection circuit is activated then the dc/dc conv erter will s hut down and will re main off until the inp u t voltage is removed an d reapplie d . in shut down mode the ag810 0 input current will be le ss than 5ma, which is below th e pse output hold current. the pse will as sume that the AG8100 has been dis c onnected and will sw itch its output off and will return to testing f o r a ? silver telecom 2006 11
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module correct signature. the thermal protection ci rcuit will continue to disable the dc/dc converter until the AG8100 tem perature has cooled suffic i ently. because each applic ation is diffe rent it is impossible to give fix e d and absolute thermal recommendations. however it is important that any enclos u re used has sufficient ventilation for the AG8100 and a direct airflow if possible. one simple method for drawing some of t he heat away from the AG8100 is shown in figure 9. power planes connected to the +v dc, -vdc and thermal ground pins can be used to draw heat away from the AG8100. t hese power planes must be o n t he outer layer of the pcb on the opposite side of the pcb to the AG8100. figure 9: pow e r plan e heatsink for AG8100 figure 10, figure 11 & figure 12 show the ma ximum ambient temperat ure under different load c onditions. these figure hav e been rec o rded in a sealed enc losure (in st ill air) us ing a heater element to elevate the ambient temperature (w ithin the enclosure). 9. over-volt a ge the AG8100 may be damaged by voltage inputs great er than 80v. if protection from electrostatic dischar ge (esd) or other hi gh voltage transients is r equired it is recommended that an over-voltage clamping dev ic e is fitted between the vin+ and the vin- pins. typically an smaj58 will be sufficient. ? silver telecom 2006 12
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module output p o wer ( w ) figure 10: ag8103 o p erating profile output p o wer ( w ) figure 11: ag8105 o p erating profile ? silver telecom 2006 13
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module outpu t power (w) figure 12: ag8112 o p erating profile ? silver telecom 2006 14
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 10. electrical characteristics 10.1. absolute maximu m rating s* p a r a m e t e r s y m b o l m i n m a x u n i t s 1 dc supply voltage v cc - 0 . 3 6 0 v 2 dc supply voltage surge for 1ms v surg e - 0 . 6 8 0 v 3 s t o r a g e t e m p e r a t u r e t s - 4 0 + 1 0 0 o c *exceeding the a bove ratings ma y cause permane nt damage to t h e product. fu nctional operation u nder these condit i ons is not imp lied. maximum ratings assume free airfl o w . 10.2. recomm ended op erating conditions p a r a m e t e r s y m b o l m i n ty p m a x u n i t s 1 input supply voltage v in 3 6 4 8 5 7 v 2 under volt age lockout v lock 3 0 v 3 o p e r a t i n g t e m p e r a t u r e t op - 1 0 2 5 70 ? t a / o c ?see section 8. oper ating temp erature range 10.3. dc electrical characteristics* dc characteristic sy m min t y p* max units test comments 1 o u t p u t v o l t a g e v ou t 2.5 4.5 7.5 3.3 5.0 12 4.5 7.5 14 v v v ag8103 ag8105 ag8112 2 output current (v in = 48v) i out 1.6 1.4 1.0 a a a ag8103 ag8105 ag8112 3 line regulation v in = 36v to 57v @ max load** v line 1.0 0.8 0.4 % % % ag8103 ag8105 ag8112 4 load regulation min to max load (v in = 48v)** v load 4.5 2.6 1.0 % % % ag8103 ag8105 ag8112 5 output ripple and noise @ max load ? v rn 90 150 64 mvp-p mvp-p mvp-p ag8103 ag8105 ag8112 6 m i n i m u m l o a d r load 1 5 0 m a for specified regulation ? 7 s h o r t - c i r c u i t d u r a t i o n t sc s e c continu o us @ 50 o c, v in =48v 8 efficiency @ 100% load, v in =48v e f f 71 79 86 % % % ag8103 ag8105 ag8112 *t y p ical figures a r e at 25 c w i th a nominal 48v suppl y after 5 minut es and ar e fo r de sign aid only . no t guar anteed **after 5 minutes ?the outp u t rippl e and noise can be reduced w i th an exte rnal filter, see application note. ?can be used w i th no load at re d u ced voltage reg u lation. ? silver telecom 2006 15
v1 .0 d e c 20 06 data sheet AG8100 pow e r-o ver-eth ern e t module 11. packag e 2.7 7 17.78 15.24 1.27 3.5 1.6 11.5 max 1.9 2.5 4 0.6 4 22.86 al l di m ensi ons ar e i n mm + / - 0 . 127 mm and ar e nom i nal val ues , unl e ss ot her w i se st at ed . 1.6 1 pcb footprint 22 .86 2.54 pitch 18.0 3.75 1. 2 5 31.75 1. 5 information pu blished in this datasheet is believed to be correc t an d accurate. silver telecom assu mes no liability f o r errors wh i c h m a y occur or for liability oth e r w ise arising out of use of this information or infringement o f patents w h ich ma y occur as a result of such u s e. no license is gra n ted b y this document under pat ents ow ne d b y silv er telecom or licensed from thir d parties b y silver telecom. the products, their sp ecification and in formation appe ar ing in this docum ent are subject to change b y silver telecom w i thout notice . ? silver telecom 2006 16

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