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參數(shù)資料
| 型號： | LTC4264IDE#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CNTRLR PD INTERFACE 12-DFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 控制器類型： | 以太網(wǎng)供電控制器（POE） |
| 接口： | IEEE 802.3af |
| 電流 - 電源： | 3mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 12-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 12-DFN（4x3） |
| 包裝： | 帶卷 (TR) |
LTC4264
21
4264f
APPLICATIONS INFORMATION
VOUT, to avoid the possibility of leakage shutting down the
LTC4264. If not used, tie SHDN to VIN.
The load capacitor connected between GND and VOUT
of the LTC4264 can store signicant energy when fully
charged. The design of a PD must ensure that this en-
ergy is not inadvertently dissipated in the LTC4264. The
polarity-protection diodes prevent an accidental short
on the cable from causing damage. However, if the VIN
pin is shorted to GND inside the PD while the capacitor
is charged, current will ow through the parasitic body
diode of the internal MOSFET and may cause permanent
damage to the LTC4264.
ELECTRO STATIC DISCHARGE AND SURGE
PROTECTION
The LTC4264 is specied to operate with an absolute
maximum voltage of –90V and is designed to tolerate brief
over-voltage events. However, the pins that interface to the
outside world (primarily VIN and GND) can routinely see
peak voltages in excess of 10kV. To protect the LTC4264,
it is highly recommended that the SMAJ58A unidirectional
58V transient voltage suppressor be installed between the
diode bridge and the LTC4264 (D3 in Figure 4).
ISOLATION
The 802.3 standard requires Ethernet ports to be electrically
isolated from all other conductors that are user accessible.
This includes the metal chassis, other connectors and
any auxiliary power connection. For PDs, there are two
common methods to meet the isolation requirement. If
there will be any user accessible connection to the PD,
then an isolated DC/DC converter is necessary to meet
the isolation requirements. If user connections can be
avoided, then it is possible to meet the safety requirement
by completely enclosing the PD in an insulated housing.
In all PD applications, there should be no user accessible
electrical connections to the LTC4264 or support circuitry
other than the RJ-45 port.
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