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| 型號(hào)： | LTC4263IS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 16/24頁(yè) |
| 文件大?。?/td> | 354K |
| 描述： | IC IEEE 803.2AF CNTRLR 14-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 以太網(wǎng)供電（PoE） |
| 應(yīng)用： | 用于以太網(wǎng)供電（PoE）設(shè)備的電源接口開(kāi)關(guān) |
| 電源電壓： | 48V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
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LTC4263
16
4263fe
APPLICATIONS INFORMATION
being shorted by the LTC4263s power control MOSFET.
The 500k resistor across D
AC
allows the port voltage to
decay after disconnect occurs.
Sizing of capacitors is critical to ensure proper function
of AC disconnect. C
PSE
(Figure 8) controls the connection
impedance on the PSE side. Its capacitance must be kept
low enough for AC disconnect to be able to sense the PD.
On the other hand, C
DET
has to be large enough to pass
the signal at 110Hz. The recommended values are 0.1糉
for C
PSE
and 0.47糉 for C
DET
. The sizes of C
PSE
, C
DET
,
and R
DET
are chosen to create an economical, physically
compact and functionally robust system. Moreover, the
complete Power over Ethernet AC disconnect system (PSE,
transformers, cabling, PD, etc.) is complex; deviating from
the recommended values of C
DET
, R
DET
and C
PSE
is strongly
discouraged. Contact the Linear Technology Applications
department for additional support.
Internal 110Hz AC Oscillator
The LTC4263 includes onboard circuitry to generate a
110Hz (typ), 2V
P-P
sine wave on its OSC pin when a
0.1糉 capacitor is connected between the OSC pin and
V
SS
. This sine wave is synchronized to the controller
inside the LTC4263 and should not be externally driven.
Tying the OSC pin to V
SS
shuts down the oscillator and
enables DC disconnect.
Power-On Reset and Reset/Backoff Timing
Upon start-up, the LTC4263 waits four seconds before
starting its rst detection cycle. Depending on the re-
sults of this detection it will either power the port, repeat
detection, or wait 3.2 seconds before attempting detection
again if in midspan mode.
The LTC4263 may be reset by pulling the SD pin low. The
port is turned off immediately and the LTC4263 sits idle.
After SD is released there will be a 4-second delay before
the next detection cycle begins.
V
DD5
Logic-Level Supply
The V
DD5
supply for the LTC4263 can either be supplied
externally or generated internally from the V
DD48
supply.
If supplied externally, a voltage between 4.5V and 5.5V
should be applied to the V
DD5
pin to cause the internal
regulator to shut down. If V
DD5
is to be generated inter-
nally, the voltage will be 4.4V (typ) and a 0.1糉 capacitor
should be connected between V
DD5
and V
SS
. Do not
connect the internally generated V
DD5
to anything other
than a bypass capacitor and the logic control pins of the
same LTC4263.
LED Flash Codes
The LTC4263 includes a multi-function LED driver to inform
the user of the port status. The LED is turned on when the
port is connected to a PD and power is applied. If the port
is not connected or is connected to a non-powered device
with a 150?or shorted termination, the port will not be
powered and the LED will be off. For other port conditions,
the LTC4263 blinks a code to communicate the status
to the user as shown in Table 3. One ash indicates low
signature resistance, two ashes indicates high resistance,
ve ashes indicates an overload fault, and nine ashes
indicates that power management is preventing the port
from turning on.
Figure 8. LTC4263 Using AC Disconnect
4263 F08
0.1糉
100V
0.1糉
NC
0.1糉
C
DET
0.47糉
X7R, 100V
C
PSE
0.1糉
X7R, 100V
SMAJ58A
LED
LEGACY
MIDSPAN
PWRMGT
V
SS
V
SS
OSC
ACOUT
LTC4263
D
AC
CMLSH05-4
500k
ISOLATED
48V SUPPLY
+
R
DET
1k
1A
V
DD5
ENFCLS
SD
V
DD48
OUT
OUT
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