參數(shù)資料
型號(hào)： LTC4263IS#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 12/24頁(yè)
文件大小： 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)
LTC4263
12
4263fe
APPLICATIONS INFORMATION
Figure 4. Classi cation Load Lines
Classi cation
An IEEE 802.3af PD has the option of presenting a
classi cation signature to the PSE to indicate how much
power it will draw when operating. This signature consists
of a speci c constant-current draw when the PSE port
voltage is between 15.5V and 20.5V , with the current level
indicating the power class to which the PD belongs. Per
the IEEE 802.3af speci cation, there are  ve classes and
three power levels for a PD as shown in Table 1. Note that
class 4 is presently reserved by the IEEE for future use.
Figure 4 shows an example PD load line, starting with the
shallow slope of the 25k signature resistor below 10V , then
drawing the classi cation current (in this case, class 3)
between 15.5V and 20.5V. Also shown is the load line for
the LTC4263. It maintains a low impedance until reaching
current limit at 60mA (typ).
The LTC4263 will classify a port immediately after a
successful detection. It measures the PD classi cation
signature current by applying 18V (typ) to the port and
measuring the resulting current. The LTC4263 identi es
the three IEEE power levels and stores the detected class
internally for use by the power management circuitry. In
addition, the LTC4263 allows selectable enforcement of
IEEE classi cation power levels. With the ENFCLS pin
high, the LTC4263 reduces the I
CUT
 current threshold if it
detects class 1 or class 2, thereby insuring that PDs which
violate their advertised class are shut down.
Table 1. IEEE 802.3af Classi cation, PD Power Consumption, and LTC4263 Enforced Power Output
IEEE 802.3af
CLASS
CLASSIFICATION
CURRENT
MAXIMUM
IEEE ALLOWABLE
PD POWER
LTC4263
ENFORCED I
CUT
 
THRESHOLD*
CLASS DESCRIPTION
0
0mA to 5mA
12.95W
375mA (typ)
PD Does Not Implement Classi cation, Unknown Power
1
8mA to 13mA
3.84W
100mA (typ)
Low Power PD
2
16mA to 21mA
6.49W
175mA (typ)
Medium Power PD
3
25mA to 31mA
12.95W
375mA (typ)
Full Power PD
4
35mA to 45mA
12.95W
375mA (typ)
Reserved, Power as Class 0
*Enforced I
CUT
 active if ENFCLS pin is high. Otherwise, I
CUT
 is 375mA (typ).
V
DD48
  V
OUT
0
60
50
40
30
20
10
0
5
10
15
20
4263 F04
25
TYPICAL
CLASS 3
PD LOAD
LINE
48mA
33mA
PSE LOAD
LINE
23mA
14.5mA
6.5mA
CLASS 4
CLASS 2
CLASS 1
CLASS 0
CLASS 3
OVER
CURRENT
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