參數(shù)資料
型號(hào)： STHS4257A
廠商： 意法半導(dǎo)體
英文描述： IEEE 802.3af PoE Powered Device (PD) Interface Controller with Integrated Signature Resistor(集成識(shí)別電阻的IEEE802.3af PoE PD 接口控制器)
中文描述： IEEE 802.3af標(biāo)準(zhǔn)的PoE供電設(shè)備（PD）接口控制器，它集成簽名電阻（集成識(shí)別電阻的IEEE802.3af標(biāo)準(zhǔn)PoE電源接口控制器）
文件頁(yè)數(shù)： 7/18頁(yè)
文件大?。?/td> 173K
代理商： STHS4257A
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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STHS4257A1 IEEE 802.3af PoE Powered Device (PD) Interface Controller with Integrated Signature Resistor(集成識(shí)別電阻的IEEE802.3af PoE PD 接口控制器)
STHS4257L IEEE 802.3af PoE Powered Device (PD) Interface Controller with Integrated Signature Resistor(集成識(shí)別電阻的IEEE802.3af PoE PD 接口控制器)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STHS4257A1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
STHS4257A1M6E 功能描述:熱插拔功率分布 ADV Analog RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
STHS4257A1M6F 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 STHS4257A STHS4257A1 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
STHS4257L 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
STHS4257L1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
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