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STHS4257L Datasheet(PDF) 9 Page - STMicroelectronics

Part # STHS4257L
Description  IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STHS4257L Datasheet(HTML) 9 Page - STMicroelectronics

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Obsolete
Product(s)
- Obsolete
Product(s)
STHS4257A, STHS4257A1, STHS4257L, STHS4257L1
Summary description
9/18
Figure 5.
Block diagram (STHS4257A/L)
Figure 6.
Typical application circuit (STHS4257A/L) with a DC/DC converter
RS
ref
25k
Signature
Resistor
Power Good
Input
Current
Limit
Classification
Current Source
Control
Circuits
+
–
+
–
EN
EN
VIN
GND
AI12206c
PWRGD
1
2
3
4
8
7
6
5
ref
NC
NC
RCLASS
NC
VOUT
Power
MOSFET
100
k
Ω
5µF
(min)
100V
0.1µF
100V
SMAJ58A
RCLASS
VIN
48V from
power sourcing
equipment (PSE)
AI12207a
RCLASS
SHDN
~
~
+
+
+
3V
to logic
–
STHS4257A/L
Powered Device (PD)
Switching
Power
Supply
Diode
Bridge
VIN
DF01S
GND
VOUT
RTN
PWRGD
C1
C2
–


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