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參數(shù)資料
| 型號： | STHS4257L |
| 廠商： | 意法半導體 |
| 英文描述： | IEEE 802.3af PoE Powered Device (PD) Interface Controller with Integrated Signature Resistor(集成識別電阻的IEEE802.3af PoE PD 接口控制器) |
| 中文描述： | IEEE 802.3af標準的PoE供電設(shè)備（PD）接口控制器，它集成簽名電阻（集成識別電阻的IEEE802.3af標準PoE電源接口控制器） |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 173K |
| 代理商： | STHS4257L |
STHS4257A, STHS4257A1, STHS4257L, STHS4257L1
Summary description
7/18
1.1
Pin descriptions
1.1.1
Classification (R
CLASS
)
This is the Classification pin. Connect a Classification resistor between this pin and V
IN
to
tell the PSE which power class will be connected. Leave it open for Class 0.
Note:
Do not connect this pin directly to V
IN
. For power classes and R
CLASS
resistor values,
see
Table 3
.
1.1.2
V
IN
This is negative return power line to PSE.
1.1.3
Power supply (GND)
This is the Power Input/Output, positive rail.
1.1.4
Signature disable input (SIGDISA)
This pin is internally pulled down to V
IN
to present a valid signature to PSE. Connect to V
IN
if it is unused. Tie to GND to present an invalid signature.
Note:
This signal is available for STHS4257A1 and STHS4257L1 only.
1.1.5
Power Good output (PWRGD)
This pin indicates that the STHS4257x/x1 power MOSFET is fully on and works in normal
operation mode (Power Good). Open drain, low impedance means that the power is good; in
all other cases, the impedance is high (referenced to V
IN
).
1.1.6
Negative power output (V
OUT
)
This is the Power Output, negative rail.
1.2
IEEE802.3af PD power classes
Table 3.
IEEE802.3af PD power classes and corresponding R
CLASS
values
Max. power levels
at input of PD (W)
1.
Class 4 is currently reserved and should not be used.
Class
Usage
Nominal classification
load current (mA)
R
CLASS
Resistor
(
Ω
, 1%)
0
Default
0.44 to 12.95
< 5
Open
1
Optional
0.44 to 3.84
10.5
124
2
Optional
3.84 to 6.49
18.5
68.1
3
Optional
6.49 to 12.95
28
45.3
4
Reserved
Reserved
(1)
40
30.9
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