ETC AG8200

V1.0 Dec 2006
Data Sheet
Silver
Ag8200
TELECOM
Power-Over-Ethernet Module
Pb
1. Features
¾ IEEE802.3af compliant
¾ Small package size - 56mm (L) x
14mm (H)
¾ Input voltage range 37V to 57V
¾ Overload and short-circuit protection
¾ Adjustable Output - 3 product
variants cover all voltages from 2.5V
to 14V
¾ Thermal Cut Off
¾ High efficiency DC/DC converter
¾ Silver Telecom “design-in” assistance
2. Description
The Ag8200 series of modules are designed to extract power from a conventional twisted pair
Category 5 Ethernet cable, conforming to the IEEE 802.3af Power-over-Ethernet (PoE)
standard.
The Ag8200 signature and control circuit provides the PoE compatibility signature and power
classification required by the Power Sourcing Equipment (PSE) before applying up to 15W
power to the port. The Ag8200 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
non-isolated regulated low ripple and low noise output. The DC/DC converter also has built-in
output overload, output short-circuit and over-temperature protection.
© Silver Telecom 2005
V1.0 Dec 2006
Data Sheet
Ag8200
Power-Over-Ethernet Module
Table of Contents
1. Features...........................................................................................................................1
2. Description.......................................................................................................................1
Table of Contents.............................................................................................................2
Table of Figures ...............................................................................................................2
3. Ag8200 Product Selector .................................................................................................3
4. Pin Description.................................................................................................................4
5. Functional Description .....................................................................................................5
5.1. Inputs ........................................................................................................................5
5.2. PD Signature.............................................................................................................5
5.3. Isolation.....................................................................................................................5
5.4. Power Classification ..................................................................................................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. Over-voltage ..................................................................................................................11
10. Electrical Characteristics..............................................................................................13
10.1. Absolute Maximum Ratings* .................................................................................13
10.2. Recommended Operating Conditions ...................................................................13
10.3. DC Electrical Characteristics* ...............................................................................14
11. Package.......................................................................................................................15
11.1. Ag8200-S ..............................................................................................................15
11.2. Ag8200-D ..............................................................................................................15
Table of Figures
Figure 1: Block Diagram with External Components............................................................3
Figure 2: Ag8200-S SIL Package Format ............................................................................4
Figure 3: Typical System Diagram.......................................................................................5
Figure 4: Class Programming Option...................................................................................6
Figure 5: Output Adjustment ................................................................................................7
Figure 6: Typical Connection Diagram.................................................................................8
Figure 7: Typical Application................................................................................................9
Figure 8: Typical Layout.....................................................................................................10
Figure 9: Power Plane Heatsink for Ag8200-S ..................................................................11
Figure 10: Ag8203 Operating Profile .................................................................................12
Figure 11: Ag8205 Operating Profile .................................................................................12
Figure 12: Ag8212 Operating Profile .................................................................................13
© Silver Telecom 2005
2
Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
3. Ag8200 Product Selector
Part Number
Nominal Output Voltage
Ag8212-S
Ag8205-S
Ag8203-S
Ag8212-D
Ag8205-D
Ag8203-D
12.0V
5.0V
3.3V
12.0V
5.0V
3.3V
Maximum Output Power *
(Watts)
12
9
6.6
12
9
6.6
Marking
Package
12
5
3
12
5
3
SIL
SIL
SIL
DIL
DIL
DIL
*At 25°C with VIN = 48V
† All versions of the Ag8200 are RoHS compliant.
Table 1: Ordering Information
Figure 1: Block Diagram with External Components
© Silver Telecom 2005
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Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
4. Pin Description
Pin #
Name
1
VIN+
2
VIN-
3
VIN+
Direct Input +. Internally connected to pin 1.
VIN-
Direct Input -. Internally connected to pin 2.
4
5
6
CP
7
-VDC
8
+VDC
9
ADJ
10
IC
Description
Direct Input +. This pin connects to the positive (+) output of the
input bridge rectifiers (internally connected to pin 3).
Direct Input -. This pin connects to the negative (-) output of the
input bridge rectifiers (internally connected to pins 4 and 5).
Class Programming. Connecting an external resistor to VIN- will
change the current class of the module. With no resistor fitted the
Ag8200 will default to Class 0.
Negative DC Output. This pin provides the negative regulated
output from the DC/DC converter.
Positive DC Output. This pin provides the positive regulated
output from the DC/DC converter.
Output Adjust. 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.
Internal Connection. Do not connect to this pin.
Figure 2: Ag8200-S SIL Package Format
© Silver Telecom 2005
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Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
5. Functional Description
5.1. Inputs
The Ag8200 has a single input that can be connected to two external bridge rectifiers (see
Figure 1). This allows the Ag8200 to be compatible with equipment that use the different
power options, see Figure 3. It is important that the PSE does not apply power to both
bridge rectifiers at the same time (Refer to IEEE802.3af for more information).
Figure 3: Typical System Diagram
5.2. PD Signature
When the Ag8200 is connected to the Cat 5e cable, it will automatically present a Powered
Device (PD) signature to the 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
The Ag8200 series conforms to the IEEE 802.3af standard except for the 1500V isolation,
which must be done externally. This is usually achieved without additional components, by
using a plastic insulating enclosure. Contact Silver Telecom for further details.
© Silver Telecom 2005
5
Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
5.4. Power Classification
This is optional from the PSE and is used for power management. The Ag8200 allows the
current class to be externally programmed by connecting a resistor between the CP and
VIN- pins, see Figure 4. If no resistor is fitted the Ag8200 will default to Class 0, a full list of
programming resistor values are shown in Table 2.
CLASS
0
1
2
3
4
Programming
Resistance (Ohms)
Do not fit
698
343
249
TBD
Min Power
(W)
0.44
0.44
3.84
6.49
Reserved
Max Power
(W)
12.95
3.84
6.49
12.95
Reserved
Table 2: Class Programming
Ag8200
VINRC
CP
Class Programming
option
Figure 4: Class Programming Option
5.5. DC/DC Converter
The Ag8200’s DC/DC converter provides a non-isolated regulated low ripple and low noise
output, that has built-in overload and short-circuit output protection, as well a built-in
thermal cut-off - see Table 1: Ordering Information for voltage and power ratings.
Because the Ag8200 series are non-isolated the +VDC output is (internally) connected to
the VIN+ input.
© Silver Telecom 2005
6
Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
5.6. Grounding
If the Ag8200 is supplied from a grounded source (e.g. a standard multi-channel 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 the
Ag8200 from operating correctly.
5.7. Output Adjustment
The Ag8200 output voltage is set externally by the RA resistor. If the RA resistor is open
circuit (O/C) then the output is set to its maximum voltage. If the RA resistor is a short
circuit (S/C) then the output will be set to its minimum voltage. Table 3 below shows the
output voltage range of each of the product variants and the values of RA required to set
the nominal output voltage.
Figure 5: Output Adjustment
Setting the output voltage, connect RA between ADJ and +VDC
Ag8203
Ag8205
Ag8212
RA
Output
RA
Output
RA
Output
O/C
4.5V
O/C
7.5V
O/C
14.0V
5K6
3.3V
3K
5V
68K
12.0V
S/C
2.5V
S/C
4.5V
S/C
7.5V
Table 3: Output Adjustment Resistor (RA) Value
*Note: the results in Table 3 are under minimum load conditions
© Silver Telecom 2005
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Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
5.8. Typical Connections
The Ag8200 only requires external bridge rectifiers on its input, the RA resistor and a low
cost capacitor on its output (a minimum of 470µF is recommended) as shown in Figure 6.
The value of C1 will be related to the maximum load step change that the output needs to
drive. For example, in an application were the output needs to cope with a 1.8 Amp load
step change, a minimum of 470µF 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 cover all product variants up to and including
the Ag8212, see Table 1: Ordering Information.
The Class programming input is optional and provides great flexibility to the Ag8200.
Further information on using this input can be found in sections 5.4. Power Classification.
RJ-45
4
5
Ag8200ADJ
7
VIN+
RA
8
+VDC
1
+
RX
Output
C1
470µF 16V
2
-VDC
3
VIN-
TX
RC*
6
CP
* Optional Class programming resistor
Figure 6: Typical Connection Diagram
© Silver Telecom 2005
8
Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
6. Typical Application
The Ag8200 can be used in numerous applications. In the example shown 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 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 Ag8200. When the midspan is
switched on (or when the device is connected), the midspan will check each output for a
PoE signature. On ports 1 and 2 the Ag8200 will identify themselves 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 peripherals. The midspan will continuously monitor
each output to see if a PoE enabled device has been added or removed.
Figure 7: Typical Application
© Silver Telecom 2005
9
Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
7. Typical Recommendations
Figure 8: Typical Layout gives an example of the tracking needed for the Ag8200. R1, R2
and R3 are optional components, but C1 needs to be positioned close to the output pins of
the Ag8200 as possible to minimise the current loop. The thermal performance of the
Ag8200 can be improved by increasing the surface area of the output tracks (+VDC and VDC) this is not applicable if the Ag8200 is in a socket.
Figure 8: Typical Layout
8. Operating Temperature Range
Because the Ag8200 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 Ag8200 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 supplied by the PSE. The information shown within
this section of datasheet is referenced to a nominal 48Vdc input voltage supplied by the
PSE.
The Ag8200 has a maximum ambient operating temperature of 70 OC see Figure 10,
Figure 11 & Figure 12. These results are in still air without any heatsinking, the
performance of the Ag8200 can be improved by forcing the airflow over the part or by
using a heatsink (see the Ag8200 application note on heatsinking for more information).
The Ag8200 has built-in thermal protection, to prevent the module from being damaged if
operated beyond its power / temperature specification. If the thermal protection circuit is
activated then the DC/DC converter will shut down and will remain off until the input
voltage is removed and reapplied. In shut down mode the Ag8200 input current will be less
than 5mA, which is below the PSE output hold current. The PSE will assume that the
Ag8200 has been disconnected and will switch its output off and will return to testing for a
correct signature. The thermal protection circuit will continue to disable the DC/DC
converter until the Ag8200 temperature has cooled sufficiently.
© Silver Telecom 2005
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Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
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 Ag8200 and a direct airflow if possible.
One simple method for drawing some of the heat away from the Ag8200 is shown in
Figure 9. Power planes connected to the +VDC and GND pins of the Ag8200 can be used
to draw heat away from the DC/DC converter via the output pins.
These power planes must be on the outer layers of the PCB and the Ag8200 must not be
fitted into a socket (this example is suitable for both –S and –D variants).
Figure 9: Power Plane Heatsink for Ag8200-S
Figure 10, Figure 11 and Figure 12 show the maximum 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).
9. Over-voltage
The Ag8200 may be damaged by voltage inputs greater than 80V. If protection from
electrostatic discharge (ESD) or other high voltage transients is required it is
recommended that an over-voltage clamping device is fitted between the VIN+ and the
VIN- pins. Typically an SMAJ58 will be sufficient.
© Silver Telecom 2005
11
Ag8200
V1.0 Dec 2006
Data Sheet
Output Power (W)
Power-Over-Ethernet Module
Output Power (W)
Figure 10: Ag8203 Operating Profile
Figure 11: Ag8205 Operating Profile
© Silver Telecom 2005
12
Ag8200
V1.0 Dec 2006
Data Sheet
Output Power (W)
Power-Over-Ethernet Module
Figure 12: Ag8212 Operating Profile
10. Electrical Characteristics
10.1. Absolute Maximum Ratings*
Parameter
1
DC Supply Voltage
2
DC Supply Voltage Surge for 1ms
3
Storage Temperature
Symbol
Min
Max
Units
VCC
-0.3
60
V
VSURGE
-0.6
80
V
TS
-40
+100
O
C
*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
VIN
36
48
57
V
36
V
70†
Ta / OC
1
Input Supply Voltage
2
Under Voltage Lockout
VLOCK
30
3
Operating Temperature
TOP
-10
25
†See Section 8. Operating Temperature Range
© Silver Telecom 2005
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Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
10.3. DC Electrical Characteristics*
DC Characteristic
Sym
Min
Typ*
Max
Units
2.5
4.5
7.5
3.3
5.0
12
4.5
7.5
14
2.0
1.8
1.0
V
V
V
A
A
A
1
Output Voltage (see Section
5.7. Output Adjustment)
VOUT
2
Output Current (VIN = 48V)
IOUT
3
Line Regulation VIN = 36V to
57V @ max load**
VLINE
4
Load Regulation min to max
load (VIN = 48V)**
VLOAD
5
Output Ripple and Noise
Max load †
6
Minimum Load
7
Short-Circuit Duration
TSC
8
Efficiency @ 100% Load,
VIN=48V
EFF
VRN
RLOAD
1.0
0.5
0.25
5.0
2.5
1.5
40
40
30
mVp-p
mVp-p
mVp-p
250
mA
%
%
∞
72
79
87
sec
%
%
%
Test
Comments
Ag8203
Ag8205
Ag8212
Ag8203
Ag8205
Ag8212
Ag8203
Ag8205
Ag8212
Ag8203
Ag8205
Ag8212
Ag8203
Ag8205
Ag8212
for specified
regulation ‡
Continuous @
50 OC, VIN=48V
Ag8203
Ag8205
Ag8212
*Typical figures are at 25°C with a nominal 48V supply and are for design aid only. Not Guaranteed
**After 5 minutes
†The output ripple and noise can be reduced with an external filter, see application note.
‡Can be used with no load at reduced voltage regulation.
© Silver Telecom 2005
14
Ag8200
V1.0 Dec 2006
Data Sheet
Power-Over-Ethernet Module
11. Package
11.1. Ag8200-S
10.0
(max)
56.0
Ag8200-S
1
3.0
0.6 ± 0.05
1.8 ± 0.25 2.54 ± 0.05
7.0 (max)
30.48 ± 0.25
0.6 ± 0.05
(Recommended PCB hole diameter = 1.1 ± 0.05)
Dimensions (in mm) are nominal unless otherwise stated
11.2. Ag8200-D
11.0
(max)
56.0
Ag8200-D
0.6 ± 0.05
1
4.0
(max)
1.8 ± 0.25 2.54 ± 0.05
30.48 ± 0.25
(Recommended PCB hole diameter = 1.1 ± 0.05)
Dimensions (in mm) are nominal unless otherwise stated
Information published in this datasheet is believed to be correct 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 Silver Telecom or licensed from third parties by Silver Telecom. The
products, their specification and information appearing in this document are subject to change by Silver Telecom without notice.
© Silver Telecom 2005
15
V1.0 Dec 2006
Data Sheet
© Silver Telecom 2005
Ag8200
Power-Over-Ethernet Module
16