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v1.3 july 2006 data sheet silver t e l e c o m 1. features ieee802.3af compliant small package size - 56mm (l) x 14mm (h) low output ripple and noise input voltage range 36v to 60v only one low cost external decoupling capacitor required overload and short-circuit protection adjustable output - 3 product variants cover all voltages from 2.4v to 13v thermal cut off high efficiency dc/dc converter silver telecom ?design-in? assistance 2. description the AG8000 series of modules ar e designed to extract power from a conventional twisted pair category 5 ethernet cable, conforming to the ieee 802.3af power-o ver-ethernet (poe) standard. ieee 802.3af allows for two power options for category 5 cables and the AG8000 series have two pairs of power inputs pins: - va1&2 and vb1&2 to accommodate this, see figure 1. the AG8000 signature and control circuit provides the poe compatibility signature and power classification required by the power sourci ng equipment (pse) before applying up to 15w power to the port. the AG8000 is compatible with class 0 to class 3 equipment. the high efficiency dc/dc converter operates ov er a wide input voltage range and provides a non-isolated regulated low ripple and low noise output. the dc/dc converter also has built-in output overload, output short-circui t and over-temperature protection. AG8000 power-over-ethernet module pb pb ? silver telecom 2006
v1.3 july 2006 AG8000 data sheet power-over-ethernet module table of contents 1. features ........................................................................................................................... 1 2. description ....................................................................................................................... 1 table of contents ............................................................................................................. 2 table of figures ............................................................................................................... 2 3. AG8000 product selector ................................................................................................. 3 4. pin desc ription ................................................................................................................. 4 5. functional description ..................................................................................................... 5 5.1. inputs ........................................................................................................................ 5 5.2. pd signature ............................................................................................................. 5 5.3. isolation ..................................................................................................................... 5 5.4. power class ification .................................................................................................. 6 5.5. dc/dc converter ...................................................................................................... 6 5.6. grounding ................................................................................................................. 7 5.7. output adjustment ..................................................................................................... 7 5.8. typical connections .................................................................................................. 8 6. typical application ........................................................................................................... 9 7. typical recommendations ............................................................................................. 10 8. operating temperature range ...................................................................................... 10 9. electrical characteristics ................................................................................................ 13 9.1. absolute maximum ratings* ................................................................................... 13 9.2. recommended operating conditions ..................................................................... 13 9.3. dc electrical characteristics* ................................................................................. 13 10. package ....................................................................................................................... 14 10.1. AG8000-s .............................................................................................................. 14 10.2. AG8000-d .............................................................................................................. 14 table of figures figure 1: block diagram ...................................................................................................... 3 figure 2: AG8000-s si l package format ............................................................................ 3 figure 3: typical syst em diagram ....................................................................................... 5 figure 4: class programming opti on ................................................................................... 6 figure 5: output adjustment ................................................................................................ 7 figure 6: typical connection diagram ................................................................................. 8 figure 7: typical application ................................................................................................ 9 figure 8: typical lay out ..................................................................................................... 10 figure 9: power plane heat sink for AG8000 (-s or -d) ...................................................... 11 figure 10: ag8003 operating profile ................................................................................. 11 figure 11: ag8005 operating profile ................................................................................. 12 figure 12: ag8012 operating profile ................................................................................. 12 ? silver telecom 2006 2
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 3. AG8000 product selector part number ? nominal output voltage maximum output power * marking package a g 8 0 1 2 - s 1 2 . 0 v 1 2 1 2 s i l a g 8 0 0 5 - s 5 . 0 v 6 5 s i l a g 8 0 0 3 - s 3 . 3 v 5 3 s i l a g 8 0 1 2 - d 1 2 . 0 v 1 2 1 2 d i l a g 8 0 0 5 - d 5 . 0 v 6 5 d i l a g 8 0 0 3 - d 3 . 3 v 5 3 d i l *at 25c w i th v in = 48v ? all versions of the AG8000 are rohs compliant. table 1: ordering information s i gnat ure & cont rol dc: dc c onv er ter AG8000 i nput i nput dc o u t put va 1 va 2 vb 1 vb 2 figure 1: block diagram 1 a g 8000-s figure 2: AG8000-s sil package format ? silver telecom 2006 3
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 4. pin description pin # name description 1 v a 1 rx input (1) . this input pin is used in conjunction with va2 and connects to the centre tap of the transformer connected to pins 1 & 2 of the rj45 connector (rx) - it is not polarity sensitive. 2 v a 2 tx input (2) . this input pin is used in conjunction with va1 and connects to the centre tap of the transformer connected to pins 3 & 6 of the rj45 connector (tx) - it is not polarity sensitive. 3 v b 1 direct input (1) . this input pin is used in conjunction with vb2 and connects to pin 4 & 5 of the rj45 connector. 4 v b 2 direct input (2) . this input pin is used in conjunction with vb1 and connects to pin 7 & 8 of the rj45 connector. 5 c p 1 class programming (1). connect an external resistor to cp2 will change the current class of the modul e. with no resistor fitted the AG8000 will default to class 0. 6 c p 2 class programming (2). connect an external resistor to cp1 will change the current class of the modul e. with no resistor fitted the AG8000 will default to class 0. 7 - v d c negative dc output. this pin provides the regulated output from the dc/dc converter. 8 + v d c positive dc output. this pin provides the regulated output from the dc/dc converter. 9 a d j output adjust. the output voltage can be adjusted from is nominal value, by connecting an exter nal resistor from this pin to either the +vdc pin or the -vdc pin. 1 0 i c internal connection. do not connect to this pin. ? silver telecom 2006 4
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 5. functional description 5.1. inputs the AG8000 has two internal bridge rectifiers (see figure 1: block diagram) connected to the va1-va2 and the vb1-vb2 inputs. this allows the AG8000 to be compatible with equipment that use the different power options, see figure 3: typical system diagram. it is important that the pse does not apply power to the va and vb outputs at the same time (refer to ieee802.3af for more information). pse ( 48v) a g 8000 dc out p ut va 1 v b 1 va 2 v b 2 +/- +/- p o w e re d de v i ce (p d ) p o w e r s o urci n g 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 * * t h e v a an d v b i n p u t s m u st n o t b e u sed at th e sam e ti m e * + - ** figure 3: ty pical sy stem diagram 5.2. pd signature when the AG8000 is connected to the cat 5e cable, it will autom atically present a powered device (pd) signature to the power sour cing equipment (pse) or midspan equipment, when requested. the equipment will then recognise that a powered device is connected to that line and supply power. 5.3. isolation the AG8000 series conforms to the ieee 802.3af standard except for the 1500v isolation, which must be done externally. this is us ually achieved without additional components, contact silver telecom for further details. ? silver telecom 2006 5
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 5.4. power classification this is optional from the pse and is used for power management. the AG8000 allows the current class to be externally programmed by connecting a resistor between the cp1 and cp2 pins, see figure 4: class programming opti on. if no resistor is fitted the AG8000 will default to class 0, a full list of programming re sistor values are shown in table 2: class programming. class 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 3 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 programming a g 8000 cp 2 cp 1 cl ass p r ogram m i ng opt ion r figure 4: class programming option 5.5. dc/dc converter the AG8000?s dc/dc converter provides a non-is olated regulated low ripple and low noise output, that has built-in over load and short-circuit output pr otection, as well a built-in thermal cut-off - see table 1: ordering information for voltage and power ratings. because the AG8000 series is non-isolated t he +vdc output is connected to the positive input through a diode bridge. ? silver telecom 2006 6
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 5.6. grounding if the AG8000 is supplied from a grounded source (e.g. a standard multi-channel pse) it is important that t he ?vdc output is not connected to ground. connecting both input and output to ground will shor t circuit the input diode bridge, this prevents correct operation of the AG8000. 5.7. output adjustment the AG8000 has an adj pin, which allows t he output voltage to be increased or decreased from its nominal value. figure 5: output adjustment show s how the adj pin is connected: - a g 8000 +v dc -v dc ad j a g 8000 +v dc -v dc ad j r e ducing t h e ou t put vol t age from nomi n al i n creasi ng the output vol t age from nom i n al r r figure 5: output adjustment reducing the output voltage, connect r betw een adj and -vdc value of r ag8003 output ag8005 output ag8012 output open circuit 3.3v 5.0v 12.0v 1 5 k 3 . 0 v 4 . 3 v 9 . 0 v 0 ohms 2.5v 2.5v 7.5v increasing the output voltage, connect r betw een adj and +vdc value of r ag8003 output ag8005 output ag8012 output open circuit 3.3v 5.0v 12.0v 1 5 k 3 . 5 v 5 . 3 v 1 2 . 5 v 0 ohms 4.5v 7.5v 13.0v table 3: output adjustment resistor (r) value *note: the results in table 3 are under minimum load conditions ? silver telecom 2006 7
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 5.8. typical connections the AG8000 only requires one external com ponent as shown in figure 6: typical connection diagram, a minimum of 470f is recommended. the value of c1 will be related to the maxi mum load step change that the output needs to drive. for example, in an application were the output needs to c ope with a 1.8 amp load step change, a minimum of 1000f should be used. this can be a standard low cost electrolytic and does not need to be a low esr type. figure 6 shows a 16v capacitor that would co ver all product variants up to and including the ag8012, see table 1: ordering information. the class programming and the out put adjust inputs are optional and are provided to give great flexibility to the AG8000 product range. fu rther information on using these inputs can be found in sections 5.4. power classi fication and 5.7. output adjustment. a g 8000 rx tx 4 5 1 2 3 6 7 8 va 1 vb 1 va 2 vb 2 cp 1 cp 2 +v dc -v dc ad j out put rj-45 c1 470 f 16v + figure 6: ty pical connection diagram ? silver telecom 2006 8
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 6. t y pical application the AG8000 can be used in numerous applications . in the example shown in figure 7: typical application, 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 out put that supports power over ethernet (poe). in this example port 1 is connected to an ethernet camera and port 2 is connected to a wireless access point, both of these devices have a built-in AG8000. when the midspan is switched on (or when the device is connect ed), the midspan will check each output for a poe signature. on ports 1 and 2 the AG8000 will identify themselves as poe enabled devices and the midspan will supply both dat a and power to these peripherals. the other ports (shown in this example) will not have a poe signature and the midspan will only pass the data through to these peripherals. the mids pan will continuously monitor each output to see if a poe enabled device has been added or removed. AG8000 e t hernet ca m e r a wi r e l e s s acce ss po i n t m i ds pan e qui pm ent sw itch p a t c h cab l es p c ' s an d ot her non p o e peri pheral s 1 8 1 8 a g 8000-s figure 7: ty pical application ? silver telecom 2006 9
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 7. t y pical recommendations figure 8: typical layout give s an example of the tracking needed for the AG8000. r1, r2 and r3 are optional components, but c1 needs to be positioned cl ose to the output pins of the AG8000 as possible to minimise the curr ent loop. the thermal performance of the AG8000 can be improved by increasing the surf ace area of the output tracks (+vdc and - vdc) this is not applicable if the AG8000 is in a socket. o u tput voltage va & vb inputs r2 r1 r3 + _ ad j c l ass c1 a g 8000- s 1 * * * h eat di ssi p a ti on of the a g8000 can b e i m proved by i n cr easi n g the surface area of the + v d c and gn d output trac ks. figure 8: ty pical lay out 8. operating t e mperature range because the AG8000 is a power co mponent, it will generate heat, so it is important that this be taken into consideration at the design stage. the heart of the AG8000 is a dc/dc converter, which like any other power supply will generate heat. the amount of heat generated by the module will depend on the load it is required to drive and the input voltage suppli ed by the pse. the information shown within this section of datasheet is referenced to a nominal 48vdc input voltage supplied by the pse. the AG8000 has a maximum ambient operating temperature of 70 o c see figure 10, figure 11 & figure 12. these results are in still air without any heatsinking, the performance of the AG8000 can be improved by fo rcing the airflow over the part or by using a heatsink (see the AG8000 application note on heatsinking for more information). the output stage of the AG8000 has a built-in thermal protecti on circuit, to prevent the module from being damaged if oper ated beyond its power / temper ature specification. because each application is different it is impossible to give fixed and absolute thermal recommendations. however it is important that any enclosure used has sufficient ventilation for the AG8000 and a direct airflow if possible. ? silver telecom 2006 10
v1.3 july 2006 data sheet AG8000 power-over-ethernet module one simple method for drawing some of t he heat away from the AG8000 is shown in figure 9. power planes connected to the +vdc and gnd pins of the AG8000 can be used to draw heat away from the dc/ dc converter via the output pins. these power planes must be on the outer laye rs of the pcb and the AG8000 must not be fitted into a socket (this example is suitable for both ?s and ?d variants). o u tput voltage pow e r plane va & vb inputs r2 r1 r3 + _ ad j c l ass a g 8000 - s 1 figure 9: pow e r plane heatsink for AG8000 (-s or -d) figure 10, figure 11 & figure 12 show the maxi mum ambient temperature under different load conditions. these figure have been recorded in a sealed enclosure (in still air) using a heater element to elevate the ambient temperature (within the enclosure). - 2 0 - 1 0 0 1 0 2 03 04 0 5 06 07 0 1 4 2 5 3 out put p o wer (w ) a m bi ent tem peraure ( c) figure 10: ag8003 operating profile ? silver telecom 2006 11
v1.3 july 2006 data sheet AG8000 power-over-ethernet module - 2 0 - 1 0 0 1 0 2 03 04 0 5 06 07 0 1 4 2 5 3 out put p o wer (w ) a m bi ent tem peraure ( c) 6 figure 11: ag8005 operating profile - 2 0 - 1 0 0 1 0 2 03 04 0 5 06 07 0 1 4 2 5 3 out put p o wer (w) a m bi ent tem peraure ( c) 6 7 8 9 10 11 12 figure 12: ag8012 operating profile ? silver telecom 2006 12
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 9. electrical characteristics 9.1. absolute maximum ratings* 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 surge - 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 *exceedi ng the above rati ngs may cause perm anent damage to the product. functi onal operat i on under these condi ti ons i s not i m p l i ed. maxi mum rati ngs assume free ai rfl o w . 9.2. recommended operating 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 6 0 v 2 under voltage lockout v lock 3 0 3 6 v 3 o p e r a t i n g t e m p e r a t u r e t op - 2 0 2 5 70 ? t a / o c ?see secti on 8. operati ng temperature range 9.3. dc electrical characteristics* dc characteristic sy m min ty p* max units test comments 1 o u t p u t v o l t a g e v out 2.5 2.5 7.5 3.3 5 12 4.5 7.5 13 v v v ag8003 ag8005 ag8012 2 output current (v in = 48v) i out 1.5 1.2 1 a a a ag8003 ag8005 ag8012 3 l i n e r e g u l a t i o n v line 0 . 1 % 4 l o a d r e g u l a t i o n v load 3 . 5 % 5 o u t p u t r i p p l e v rp 100 mvp-p @ max load ? 6 output ripple and spikes v spk 200 mvp-p @ max load ? 7 m i n i m u m l o a d r load 1 0 0 m a for specified regulation ? 8 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 continuous @ 50 o c, v in =48v 9 e f f i c i e n c y e f f 7 4 % ag8012 @ 50% load 1 0 t e m p e r a t u r e c o e f f i c i e n t t c 0 . 0 5 % per o c *ty p i c al fi gures are at 25c w i th a nomi nal 48v suppl y and are for desi gn ai d onl y . not guaranteed ?the output ri ppl e and spi k es can be reduced w i th an external fi l t er, see appl i c ati on note. ?can be used w i th no l oad at reduced vol t age regul ati on. ? silver telecom 2006 13
v1.3 july 2006 data sheet AG8000 power-over-ethernet module 10. package 10.1. AG8000-s 0 . 2 . a g 8 0 0 0 - d 56.0 10. 0 (max ) 14.0 1.8 0.25 30.48 0.25 ( r ecommended pc b hol e diamet er = 1.1 0. 05) d i mensio ns ( i n mm ) are nomi n al unless ot herw ise st at ed 2.54 0.05 0.6 0.05 0.6 0.05 1 3.0 7.0 ( m ax) a g 8000-s 1 56.0 11.0 ( m ax) 14.0 1.8 0.25 30.48 0.25 ( r ecommended pc b hol e diamet er = 1.1 0. 05) d i mensio ns ( i n mm ) are nomi n al unless ot herw ise st at ed 2.54 0.05 1 3.0 a g 8000-d 0.6 0.05 ? silver telecom 2006 14

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