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參數(shù)資料
| 型號： | LTC4266AIUHF-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC38 |
| 封裝： | 7 X 5 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大小： | 325K |
| 代理商： | LTC4266AIUHF-1#TRPBF |
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LTC4266A/LTC4266C
16
4266acf
operAtion
To avoid damaging legacy data equipment that does not
expect to see DC voltage, the PoE spec defines a protocol
that determines when the PSE may apply and remove
power. Valid PDs are required to have a specific 25k
common-mode resistance at their input. When such a PD
is connected to the cable, the PSE detects this signature
resistance and turns on the power. When the PD is later
disconnected, the PSE senses the open circuit and turns
power off. The PSE also turns off power in the event of a
current fault or short-circuit.
When a PD is detected, the PSE optionally looks for a
classification signature that tells the PSE the maximum
power the PD will draw. The PSE can use this information
to allocate power among several ports, police the current
consumption of the PD, or to reject a PD that will draw
more power that the PSE has available. For a 802.3af PSE,
the classification step is optional; if a PSE chooses not to
classify a PD, it must assume that the PD is a 13W (full
802.3af power) device.
New in 802.3at
Thenewer802.3atstandardsupersedes802.3afandbrings
several new features:
APDmaydrawasmuchas25.5W.SuchPDs(andthe
PSEs that support them) are known as Type 2. Older
13W 802.3af equipment is classified as Type 1. Type 1
PDs will work with all PSEs; Type 2 PDs may require
Type2PSEstoworkproperly.TheLTC4266A/LTC4266C
is designed to work in both Type 1 and Type 2 PSE de-
signs, and also supports non-standard configurations
at higher power levels.
TheClassificationprotocolisexpandedtoallowType2
PSEs to detect Type 2 PDs, and to allow Type 2 PDs to
determine if they are connected to a Type 2 PSE. Two
versions of the new Classification protocol are avail-
able: an expanded version of the 802.3af Class Pulse
protocol, and an alternate method integrated with the
existing LLDP protocol (using the Ethernet data path).
The LTC4266A/LTC4266C fully supports the new Class
Pulse protocol and is also compatible with the LLDP
protocol(whichisimplementedinthedatacommunica-
tions layer, not in the PoE circuitry).
Faultprotectioncurrentlevelsandtimingareadjusted
to reduce peak power in the MOSFET during a fault;
this allows the new 25.5W power levels to be reached
using the same MOSFETs as older 13W designs.
Extended Power LTPoE++
TheLTC4266Aaddsthecapabilitytoautonomouslydeliver
up to 90W of power to the PD. LTPoE++ PDs may forgoe
802.3 LLDP support and rely solely on the LTPoE++ Physi-
cal Classification to negotiate power with LTPoE++ PSEs;
this greatly simplifies high-power PD implementations.
LTPoE++ classification may be optionally enabled for the
LTC4266A by setting both the High Power Enable and
LTPoE++ Enable bits.
The higher levels of LTPoE++ delivery impose additional
layoutandcomponentselectionconstraints.TheLTC4266A
is offered in 4 power levels (-1, -2, -3, and -4) which
allows the AUTO pin mode LTC4266A to autonomously
power up to supported power levels. If the AUTO pin is
high, internal circuitry determines the maximum deliver-
able power. PDs requesting more than the available power
limits are not powered.
Table 1. LTPoE++ Auto Pin Mode Maximum Delivered
Power Capabilities
PART
PAIRS
PD POWER
LTC4266A-1
2
35W
LTC4266A-2
2
45W
LTC4266A-3
4
70W
LTC4266A-4
4
90W
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