Linear Technology LTC4265 IEEE802.3at PD Controller DC1415A DC1415A Data Sheet
Product codes
DC1415A
LTC4265
20
4265fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2008
LT 0909 REV A • PRINTED IN USA
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1952
LT1952-1
LT1952-1
Single Switch Synchronous Forward Controller
Adjustable Switching Frequency, Programmable Undervoltage Lockout,
Optional Burst Mode
Optional Burst Mode
®
Operation at Light Load
LTC3805
Adjustable Frequency Current Mode Flyback Controller
Slope Comp Overcurrent Protect, Internal/External Clock
LTC3825
Isolate No-Opto Synchronous Flyback Controller with
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Wide Input Supply Range
Adjustable Switching Frequency, Programmable Undervoltage Lockout,
Accurate Regulation without Trim, Synchronous for High Effi ciency.
Accurate Regulation without Trim, Synchronous for High Effi ciency.
LTC4257-1
IEEE 802.3af PD Interface Controller
100V 400mA Internal Switch, Programmable Classifi cation Current Limit
LTC4258
Quad IEEE 802.3af Power over Ethernet Controller
DC Disconnect Only, IEEE-Compliant PD Detection and Classifi cation,
Autonomous Operation or I
Autonomous Operation or I
2
C Control
LTC4259A-1
Quad IEEE 802.3af Power over Ethernet PSE Controller
with AC Disconnect
with AC Disconnect
AC or DC Disconnect IEEE-Compliant PD Detection and Classifi cation,
Autonomous Operation or I
Autonomous Operation or I
2
C Control
LTC4263/LTC4263-1 Single IEEE 802.3af Power over Ethernet Controller
Internal Switch, Autonomous Operation or I
2
C Control. 15.4W or 30W.
LTC4264
High Power PD Interface Controller with 750mA
Current Limit
Current Limit
750mA Internal Switch, Programmable Classifi cation Current Limit
with disable, Complementary Power Good
with disable, Complementary Power Good
LTC4267
LTC4267-1
LTC4267-3
LTC4267-1
LTC4267-3
IEEE 802.3af PD Interface with Integrated Switching
Regulator
Regulator
100V 400mA Internal Switch, Programmable Classifi cation, 200KHz
or 300KHz Constant Frequency PWM, Interface and Switcher Optimized
for IEEE-Compliant PD System.
or 300KHz Constant Frequency PWM, Interface and Switcher Optimized
for IEEE-Compliant PD System.
LTC4268-1
High Power PD with Synchronous No Opto Flyback
Controller
Controller
750mA Internal Switch, Programmable Class, Current Limit, Synchronous
Programmable Switching Frequency and UVLO, High Effi ciency
Programmable Switching Frequency and UVLO, High Effi ciency
ThinSOT is a trademark of Linear Technology Corporation.
•
•
FDS2582
10.0k
33k
10μF
16V
16V
237k
30.9Ω
82k
158k
332k
22.1k
1.2k
4.7nF
100pF
10μF
100V
100V
0.1μF
100V
100V
SMAJ58A
B1100
s 8 PLCS
2.2μF
100V
100V
PA2431NL
4265 TA03a
PGND
GND
SD_VSEC
OC
ISENSE
COMP
FB
VREF
SS_MAXDC
OUT
BLANK
DELAY
ROSC
LT1952
V
IN
V
CC
S
OUT
GND
R
CLASS
SHDN
LTC4265
T2PSE
V
IN
V
OUT
10μH
–54V
FROM
DATA
PAIR
–54V
FROM
SPARE
PAIR
•
5V
5A
5A
220μF
6.3V
PSLVOJ227M(12)
6.3V
PSLVOJ227M(12)
FDS8880
FDS8880
+
GND
GND
5V
2.2nF
2kV
BAS516
BAS516
10k
133Ω
0.1μF
1mH
DO1608C-105
IRF6217
4.7nF
250V
50mΩ
5.1Ω
158k
0.22μF
5.1Ω
1nF
5.1Ω
1nF
6.8μH
PG0702.682
+
2k
PS2801-1-L
PS22801-1-L
BC857BF
TLV431A
1.5k
33k
22k
0.1μF
10nF
11.3k
3.65k
51k
20k
T2P (TO MICROCONTROLLER)
BAS516
BAS516
18V
PDZ18B
PDZ18B
V
CC
PoE-Based Self-Driven Synchronous Forward Power Supply
TYPICAL APPLICATION
LOAD (A)
0.5
EFFICIENCY (%)
80
85
90
5
4265 TA03b
75
65
70
1.5
2
1
3
2.5
4
4.5
3.5
95
42V
50V
57V
50V
57V
Effi ciency vs Load Current