LTC4269-1_15 Datasheet, PDF(41/44 Page) Linear Technology – IEEE 802.3at PD with Synchronous No-Opto Flyback Controller

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LTC4269-1_15 Datasheet, PDF (41/44 Pages) Linear Technology – IEEE 802.3at PD with Synchronous No-Opto Flyback Controller

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TYPICAL APPLICATIONS

PoE-Based 3.3V, 7A Power Supply

LTC4269-1

48V AUXILIARY

POWER

B1100 Ã 8 PLCS

54V FROM

DATA PAIR

S1B

VPORTP

107k

36V

PDZ36B

10k

BSS63LT1

S1B

54V FROM

SPARE PAIR

10Î©

SMAJ58A

0.1Î¼F

100V

30.9Î©

24k

T1: PCA ELECTRONICS, EPC3408G-LF

PULSE, PA2466NL

T2: PULSE, PE-68386NL

C1: PSLB20J107M(25)

B1100

383k

14.0k

UVLO

VPORTP

SHDN

RCLASS

VPORTN

VNEG SYNC

10Î¼H

10Î¼F

2.2Î¼F

BAS21

29.4k

20Î©

3.01k

20k

22Î¼F

1Î¼F

PWRGD

FB VCC

LTC4269-1

SENSE+

SENSEâ

GND OSC PGDLY tON ENDLY RCMP CCMP VCMP

33pF

12k

100k

38.3k 1k

0.1Î¼F

2.2nF

150Î©

22pF

0.18Î¼H

47Î¼F

3.3V

100Î¼F

B0540W

5.1Î©

2.2nF

FDS8670

FDS2582

2.2nF

47Î©

2kV

33mÎ©

100Î©

1Î¼F

5.1k

6.8nF

MMBT3906 MMBT3904

1Î¼F

16V

15Î©

2.2nF

BAT54 10k

42691 TA05a

Efï¬ciency

37VIN

48VIN

57VIN

0.7 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7.0

LOAD CURRENT (A)

42691 TA05b

Regulation

3.45

3.42

3.39

3.36

50VIN

3.33

42VIN

3.30

3.27

57VIN

3.24

3.21

3.18

3.15

0.7 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7.0

LOAD CURRENT (A)

42691 TA05c

42691fc

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