參數(shù)資料
型號(hào)： STHS4257L1
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）
文件頁數(shù)： 1/18頁
文件大?。?/td> 173K
代理商： STHS4257L1
July 2007
Rev 4
1/18
1
STHS4257A, STHS4257A1
STHS4257L, STHS4257L1
IEEE 802.3af PoE Powered Device (PD)
interface controller with integrated signature resistor
Features
■
IEEE 802.3af-compliant interface for Powered
Devices (PDs)
■
Integrated 100V, 450mA power MOSFET low
side switch
■
Inrush current limit
■
Normal operation current limit
■
Integrated 25k
Ω
signature resistor
■
Signature disable (STHS4257A1/L1)
■
Resistor-programmable classification current
(Class 0-4)
■
Power Good output, open drain
■
Undervoltage Lockout (UVLO)
■
Thermal overload protection (two-step for the
STHS4257A/L)
■
Latch (L) or auto-retry (A) after repetitive
thermal overload
■
Industrial temperature range: –40 to +85°C
■
SO8 and DFN8 (3mm x 3mm) packages
■
RoHS compliant
Applications
■
Voice over IP (VoIP) phones
■
Web cameras
■
WLAN access points
■
Internet appliances
■
POS terminals
■
RFID readers
DFN8 3mm x 3mm (DB)
SO8 (M)
8
1
Table 1.
Device options
Order code
Signature
disable
UVLO
threshold,
rising (V)
UVLO
threshold,
falling (V)
Protection
mode
Thermal
overload
protection
Inrush
current limit
(mA, typ)
Normal
operation
current limit
(mA, typ)
STHS4257A
39.2
30.5
Auto
2 steps
350/188
(1)
STHS4257A1
36.0
30.5
Auto
1 step
140
375
STHS4257L
39.2
30.5
Latch
2 steps
350/188
(1)
STHS4257L1
36.0
30.5
Latch
1 step
140
375
1.
Current limit is common for both modes and gets reduced only in case of thermal overload. See
Table 5: Electrical parameters
.
相關(guān)PDF資料
PDF描述
STHS4257A 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)
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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