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參數(shù)資料
| 型號： | LTC4264CDE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.65 A SWITCHING CONTROLLER, PDSO12 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229WGED, DFN-12 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大小： | 304K |
| 代理商： | LTC4264CDE |
LTC4264
10
4264f
APPLICATIONS INFORMATION
RX –
6
RX +
3
TX –
2
TX +
RJ45
T1
POWERED
DEVICE (PD)
INTERFACE
AS DEFINED
BY IEEE 802.3af
4264 F04
1
7
8
5
4
SPARE –
SPARE+
TO PHY
BR2
0.1
F
100V
BR1
GND
D3
LTC4264
VIN
Figure 4. PD Front End Using Diode Bridges on Main and Spare Inputs
pin high will reduce the signature resistor to 10k which is
an invalid signature per the IEEE 802.3af specications.
This will prevent a PSE from detecting and powering the
PD. This invalid signature is present in the PSE probing
range of –2.8V to –10V. When the input rises above –10V,
the signature resistor reverts to 25k to minimize power
dissipation in the LTC4264. To disable the signature, tie
SHDN to GND. Alternately, the SHDN pin can be driven
high with respect to VIN. When SHDN is high, all functions
are disabled. For normal operation tie SHDN to VIN.
CLASSIFICATION
Once the PSE has detected a PD, the PSE may option-
ally classify the PD. Classication provides a method for
more efcient allocation of power by allowing the PSE
to identify lower-power PDs and assign the appropriate
power level to these devices. For each class, there is an
associated load current that the PD asserts onto the line
during classication probing. The PSE measures the PD
load current in order to assign the proper PD classica-
tion. Class 0 is included in the IEEE 802.3af specication
to cover PDs that do not support classication. Class 1-3
partition PDs into three distinct power ranges as shown in
Table 2. Class 4 is reserved by the IEEE 802.3af committee
for future use. The new Class 5 dened here is available
for system vendors to implement a unique classication
for use in closed systems and is not dened or supported
by the IEEE 802.3af. With the extended classication
range available in the LTC4264, it is possible for system
designers to dene multiple classes using load currents
between 40mA and 75mA.
GND
VIN
SHDN
LTC4264
SIGNATURE DISABLE
4264 F05
25k SIGNATURE
RESISTOR
16k
TO
PSE
Figure 5. 25k Signature Resistor with Disable
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