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參數(shù)資料
| 型號(hào)： | STHS4257L |
| 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)： | 10/18頁 |
| 文件大小： | 173K |
| 代理商： | STHS4257L |
Summary description
STHS4257A, STHS4257A1, STHS4257L, STHS4257L1
10/18
Figure 7.
Block diagram (STHS4257A1/L1)
1.
2.
Ref.1 = I
LIMIT HIGH
Ref. 2 = I
LIMIT LOW
Figure 8.
Typical application circuit (STHS4257A1/L1) with a DC/DC converter
RS
ref1(1)
ref2(2)
25k
Signature
Resistor
9k
Ω
16k
Ω
Power Good
Input
Current
Limit
Classification
Current Load
Control
Circuits
+
–
+
–
EN
EN
VIN
VOUT
GND
AI12208a
PWRGD
1
2
3
4
8
7
6
5
ref
NC
NC
RCLASS
SIGDISA
Signature Disable
Power
MOSFET
100
k
Ω
5μF
(min)
100V
0.1μF
100V
SMAJ58A
RCLASS
VIN
48V from
power sourcing
equipment (PSE)
AI12209a
RCLASS
SHDN
~
~
+
+
+
3V
to logic
–
–
STHS4257A1/L1
Powered Device (PD)
Switching
Power
Supply
Diode
Bridge
VIN
DF01S
GND
VOUT
SIGDISA
PWRGD
RTN
C1
C2
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