Rainbow-electronics MAX5953D Manuel d'utilisateur télécharger pdf (Page 23)

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

______________________________________________________________________________________ 23

Figure 9. DC-DC Converter Block Diagram (Voltage-Mode PWM Controller and Two-Switch Power Stage)

OVT

DCUVLO

REFOK

REGOK

OVRLD

80µA

33µA

IFLT

OVRLD

CPWM

ILIM

DCUVLO

REGOUT

RCFF

FLTINT

RAMP

OPTO

CSS

GND

INBIAS

HVIN

DCUVLO

PPWM

BST

XFRMRH

DRVIN

XFRMRL

DRNH

SRC

PGND

RTCT

REGOK

REG

OVT

REFOK

REF

(1.25V)

7.5V

50Ω

GND

T-FF

SHDN

OSC

50Ω

GND

CLK

THERMAL

SHUTDOWN

OVT

1.25V

DCUVLO

80ns

DELAY

LEADING-

EDGE

DELAY

ONE

SHOT

LEVEL

SHIFT

10MHz

PGND

150mV

0.4Ω

30Ω

0.4Ω

MAX5953A

MAX5953B

MAX5953C

MAX5953D

2.7V/1.9V

Block Diagrams (continued)

1 2 ... 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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