Datasheet

LTC4265
20
4265fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2008
LT 0909 REV A • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1952
LT1952-1
Single Switch Synchronous Forward Controller Adjustable Switching Frequency, Programmable Undervoltage Lockout,
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
Wide Input Supply Range
Adjustable Switching Frequency, Programmable Undervoltage Lockout,
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
2
C Control
LTC4259A-1 Quad IEEE 802.3af Power over Ethernet PSE Controller
with AC Disconnect
AC or DC Disconnect IEEE-Compliant PD Detection and Classifi cation,
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
750mA Internal Switch, Programmable Classifi cation Current Limit
with disable, Complementary Power Good
LTC4267
LTC4267-1
LTC4267-3
IEEE 802.3af PD Interface with Integrated Switching
Regulator
100V 400mA Internal Switch, Programmable Classifi cation, 200KHz
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
750mA Internal Switch, Programmable Class, Current Limit, Synchronous
Programmable Switching Frequency and UVLO, High Effi ciency
ThinSOT is a trademark of Linear Technology Corporation.
•
•
FDS2582
10.0k
33k
10µF
16V
237k
30.9
82k 158k
332k
22.1k
1.2k
4.7nF
100pF
10µF
100V
0.1µF
100V
SMAJ58A
B1100 s 8 PLCS
2.2µF
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
220µF
6.3V
PSLVOJ227M(12)
FDS8880FDS8880
+
GND
GND 5V
2.2nF
2kV
BAS516
BAS516
10k
133
0.1µF
1mH
DO1608C-105
IRF6217
4.7nF
250V
50mΩ
5.1
158k
0.22µF
5.1
1nF
5.1
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
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 21
32.5
4 4.53.5
95
42V
50V
57V
Effi ciency vs Load Current