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V1.7 October 2009 Datasheet Ag9200-S Power-Over-Ethernet Module © Silver Telecom 2009 Silvertel
1 Features
IEEE802.3af compliant Small SIL package size - 56mm (L) x 14mm (H) Low output ripple and noise Input voltage range 36V to 57V Minimal (low cost) external components required Overload and short-circuit protection Adjustable Output Higher efficiency DC/DC converter 1500V isolation (input to output) Silvertel “design-in” assistance
2 Description
The Ag9200 series of modules are designed to extract power from a conventional twisted pair Category 5 Ethernet cable, confo rming to the IEEE 802.3af Power-over-Ethernet (PoE) standard. The Ag9200 signature and cont rol circuit provides the Po E compatibilit y signature and power classification required by the Power Sourcing Equipment (PSE) before applying up to 15W power to the port. The Ag9200 is compatible with Class 0 to Class 3 equipment. The high efficiency DC/DC converter operates over a wide input voltage range and provides a regulated low ripple and low noise output. The DC/DC converter also has built- in overload and short-circuit output protection. PbPb
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 3
3 Ag9200 Product Selector
Part Number† Nominal Output Voltage Maximum Output Power * Marking Ag9205-S 5.0V 13 Watts 5 Ag9203-S 3.3V 10 Watts 3 *At 25°C with VIN = 48V † The Ag9200 fully meets the requirements of the RoHS directive 2002/95/EC on the restriction of hazardous substances in electronic equipment. Table 1: Ordering Information Input Input Signature & Control DC:DC Converter Ag9200-S DC Output VIN+ +VDC -VDC ADJ 470uF +VDC -VDCVIN- - + Figure 1: Block Diagram
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 4 Figure 2: Ag9200 Package Format
4 Pin Description
Pin # Name Description 1 VIN+ Direct Input +. This pin connects to the positive (+) output of the input bridge rectifiers (internally connected to pin 3). 2 VIN- Direct Input -. This pin connects to the negative (-) output of the input bridge rectifiers (internally connected to pins 4 and 5). 3 VIN+ Direct Input +. Internally connected to pin 1. VIN- Direct Input -. Internally connected to pin 2. 6 CP Class Programming. Connecting an external resistor to VIN- will change the current class of the module. With no resistor fitted the Ag9200 will default to Class 0. 7 -VDC Ground. The ground return for the +VDC output. 8 +VDC DC Output. This pin provides the regulated output from the DC/DC converter.
9 ADJ
Output Adjust. The output voltage can be adjusted from its nominal value, by connecting an external resistor from this pin to either the +VDC pin or the -VDC pin. 10 IC Internal Connection. Do not connect to this pin.
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 5
5 Functional Description
5.1 Inputs
The Ag9200 is compatible wit h equipment that uses the di fferent power options, see Figure 3: Typical System Diagram. It is specified that the PSE does not apply power to the both outputs at the same time (Refer to IEEE802.3af for more information). Figure 3: Typical System Diagram
5.2 PD Signature
When the Ag9200 is connected to the Cat 5e cable, it will automatically present a Powered Device (PD) signature to t he Power Sourcing 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
To meet the safety isolat ion requirements of IEEE802.3af section 33.4.1 a Powered Device (PD) must pass the electrical strength test of IEC 60950 sub cl ause 6.2. This calls for either a) 1000VAC test or b) 1500V impulse test. The Ag9200 is designed to meet b) 1500V impulse test. . It is also important that the tracks on ei ther side of the isolation
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 6 barrier have at least a 3mm clearance, see Figures 8 & 9 and Section 11 for more information.
5.4 Power Classification
This is optional from the PSE and is used for power m anagement. The Ag9200 allows the current class to be externally programmed by connecting a resistor between the CP and VIN- pins, see Figure 4: Class Programming Option . If no resistor is fi tted the Ag9200 will default to Class 0, a full list of progr amming resistor values are shown in Table 2: Class Programming. CLAS S Programming Resistance (Ohms) Min Power (W) Max Power (W) 0 Do not fit 0.44 12.95 1 698 ±1% 0.44 3.84 2 383 ±1% 3.84 6.49 3 249 ±1% 6.49 12.95
4 TBD Reserved Reserved
Table 2: Class Programming Ag9200 VIN- CP Class Programming option R Figure 4: Class Programming Option
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 7
5.5 DC/DC Converter
The Ag9200’s DC/DC converter provides a regulated low ripple and low noise output that has built-in overload and short-circuit output protection - see Table 1: Ordering Information for voltage and power ratings.
5.6 Output Adjustment
The Ag9200 has an ADJ pin, which allows the output voltage to be increased or decreased from its nominal value. Figure 5: Output Adjustment shows how the ADJ pin is connected: - Ag9200 +VDC -VDC ADJ Ag9200 +VDC -VDC ADJ Increasing the output voltage from nominal Reducing the output voltage from nominal R R Figure 5: Output Adjustment Reducing the output voltage, connect R between ADJ and +VDC Value of R Ag9203 output Ag9205 output Open Circuit 3.30V 5.00V 0 Ohms 2.90V 4.50V Increasing the output voltage, connect R between ADJ and -VDC Value of R Ag9203 output Ag9205 output Open Circuit 3.30V 5.00V 0 Ohms 3.65V 5.65V Table 3: Output Adjustment Resistor (R) Value
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 8
5.7 Typical Connections
Figure 6: Typical Connection Diagram, a minimum of 470µF is recommended. The value of C1 will be rela ted to the maxim um load step change that the output needs to drive. For example, in an app lication were the output needs to cope with high load step changes, a minimum of 1000µF should be used. This can be a standard low cost electrolytic and does not need to be a low ESR type (ESR between 100mΩ to 350mΩ). Figure 6 shows a 16V capacitor that would cover all product variants up to and including the Ag9205, see Table 1: Ordering Information. The Class programming and the Output Adjust inputs are optional and are provided to g ive great flexibility to the Ag9200 product range. Further information on using these inputs can be found in sections Power Classification and Output Adjustment. Ag9200 RX TX VIN+ VIN- CP +VDC -VDC ADJ Output RJ-45 470µF 16V RC* * Optional Class programming resistor + - + - Figure 6: Typical Connection Diagram
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 9
6 Typical Application
The Ag9200 can be used in numerous applications, in the example shown in Figure 7: Typical A pplication, the data outputs from the switch are connected to the inputs of a midspan. The mids pan will then add power (t o the data) on each out put that supports Power over Ethernet (PoE). In this example port 1 is connected to an et hernet camera and port 2 is connected to a wireless access point, both of these devices have a built-in Ag9200. 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 Ag9200 will identify themselv es as PoE enabled devices and the midspan will supply both data 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 periphera ls. The midspan will continuously monitor each output to see if a PoE enabled device has been added or removed. Figure 7: Typical Application
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 10
7 Typical Recommendations
Figure 8: Typical Layout gives an example of the tra cki ng needed for the Ag9200. R1, R2 and R3 are optional co mponents, The thermal perfo rmance of the Ag9200 can be improved by increasing the surface area of the output tracks (+VDC and -VDC). This is not applicable if the Ag9200 is in a socket. Output VoltageINPUTS ADJ CLASS Ag92001 * * * Heat dissipation of the Ag9200C-S can be improved by increasing the surface area of the +VDC and GND output tracks. Isolation Barrier (keep out area) Figure 8: Typical Layout
8 Operating Temperature Range
Because the Ag9200 is a power component, it will generate heat, so it is important that this be taken into consideration at the design stage. The heart of the Ag9200 is a DC/DC converter, which like any other power supply will generate heat. The amount of heat generated by the module wi ll 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 Ag9200 has a maximum ambient operating temperature of 70 OC see Figure 10 & Figure 11 . These results are in still air without any h eatsinking, the performance of the Ag9200 can be improved by forcing the airflow ov er the part or by using a heatsink (see the Ag9200 application note on heatsinking for more information). The output stage of the Ag9200 has a built-in thermal protecti on circuit, to prevent the module from being damaged if operated beyond its power / temperature specification. Because each application is diffe rent it is impossible to give fixed and absolute thermal recommendations. However it is important that any enclosure used has sufficient ventilation for the Ag9200 and a direct airflow if possible.
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 12 - 2 0 - 1 00 1 02 03 04 05 06 07 0 Output Power (W) Ambient Temperature (°C) Figure 11: Ag9205 Operating Profile
9 Protection
The Ag9200 must be protect ed from over-voltages exceed ing the 80V maximum rated surge input voltage. An inex pensive but effective solution can be achieved by connect Tranzorb diodes across each of the inputs; see Apps Note “ANX-POE-Protection”.
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 13
10.1 Absolute Maximum Ratings1
Parameter Symbol Min Max Units 1 DC Supply Voltage VCC -0.3 60 V 2 DC Supply Voltage Surge for 1ms VSURGE -0.6 80 V
3 Storage Temperature TS -40 +100 OC
Note 1: Exceeding the above ratings may cause permanent damage to the product. Functional operation under these conditions is not implied. Maximum ratings assume free airflow.
10.2 Recommended Operating Conditions
Parameter Symbol Min Typ Max Units
1 Input Supply Voltage1 V IN 36 48 57 V
2 Under Voltage Lockout VLOCK 30 36 V
3 Operating Temperature 2 T OP -20 25 70 Ta / OC
Note 1: With minimum load 2: See Section Operating Temperature Range
10.3 DC Electrical Characteristics
DC Characteristic Sym Min Typ1 Max Units Test Comments 1 Nominal Output Voltage +VDC 3.1 4.75 3.3 3.5 5.25 V V Ag9203 Ag9205 2 Output Current (VIN = 48V) PWR 3.03 2.6 A A Ag9203 Ag9205 3 Line Regulation VLINE 0.1 % @ 50% Load 4 Load Regulation VLOAD 0.5 % @ VIN=48V
5 Output Ripple and Noise VRN 80 mVp-p @ Max load2
6 Minimum Load RLOAD 100 mA for specified
7 Short-Circuit Duration4 TSC ∞ sec
8 Efficiency EFF 88 % Ag9205 @
50% Load
9 Isolation Voltage (I/O) VISO 1500 VPK Impulse Test
10 Temperature Coefficient TC 0.02 % Per OC Note 1: Typical figures are at 25°C with a nominal 48V supply and are for design aid only. Not Guaranteed 2: The output ripple and noise can be reduced with an external filter, see application note. 3: Can be used with a minimum load of 20mA with reduced voltage regulation. 4: Continuous short circuit duration is applicable at 25'C ambient temperature in free air. At higher temperatures or with restricted airflow (e.g. in a sealed enclosure) the duration will need to be limited to avoid overheating.
V1.7 October 2009 Data Sheet Ag9200 Power-Over-Ethernet Module © Silver Telecom 2009 14
11.1 Ag9200
56.0 18.0 (max) 14.0 (Recommended PCB hole diameter = 1.1 ± 0.05) Dimensions (in mm) are nominal unless otherwise stated 0.6 ± 0.05 3.0 7.0 (max) Ag9200 17.03.0 Isolation Barrier Information published in this datasheet is believed to be correc t and accurate. Silver Telecom assumes no liability for errors which may occur or for liability otherwise arising out of use of this information or infringement of patents which may occur as a result of such use. No license is granted by this document under patents owned by Silv er Telecom or licensed from thir d parties by Silver Telecom. The products, their specification and information appearing in this document are subject to change by Silver Telecom without notice.