Rainbow-electronics MAX5953D Manual do Utilizador descarregar pdf (Página 20)

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

20 ______________________________________________________________________________________

PGOOD

14.7kΩ

316kΩ

V+

DISC

)

25.5kΩ

22µF

63V

68nF

210kΩ

100pF

150pF

100pF

0.022µF

PGOOD

60V

-48V

RTN

-48V

0.5A

RCLASS

)

255Ω

4700pF

2.2µF

26.7kΩ

100kΩ

1kΩ

RCLASS

DCUVLO

HVIN

DRNH

PPWM

BST

33, 34

XFRMRH

31, 32

XFRMRL

28, 29

INBIAS

RCFF

RAMP

DRVIN

GATE

OUT

REGOUT

FLTINT

42 24

RTCT

CSS

GND

OPTO

PGND

OPEN

C13

1µF

R10

OPEN

R13

14.3kΩ

R11

6.81kΩ

R12

1.78kΩ

3.9kΩ

220µH

C10

0.022µF

C16

0.01µF

C14

0.15µF

C11

22µF

C12

1µF

26, 27

TL431CD

SRC

R16

4.99kΩ

C15

0.03µF

OUT

12V, 0.75A

GND

MAX5953A

Figure 7. PD with Nonisolated Step-Down (Buck) Converter

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26 27

General Description 1
Features 1
Ordering Information 1
Applications 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
Pin Description 10
Pin Description (continued) 11
Typical Application Circuit 12
MAX5953A 13
Detailed Description 15
Optocoupled Feedback 17
Internal Regulators 17
Applications Information 18
Table 3. Component Suppliers 21
Block Diagrams 22
Block Diagrams (continued) 23
Typical Operating Circuit 24
Chip Information 25
Selector Guide 25
Pin Configuration 25
Package Information 26
M. Quijano 27

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