Rainbow-electronics MAX5074 Bedienungsanleitung PDF herunterladen (Seite 8)

MAX5074

Detailed Description

The MAX5074 PWM power IC is the primary-side

controller for voltage-mode, isolated forward or flyback

power converters. This device provides a high degree of

integration aimed at reducing the cost and printed circuit

board area of isolated output power supplies. Use the

MAX5074 primarily in 48V power bus applications.

The MAX5074 is a complete power IC capable of deliver-

ing up to 15W of output power. This device contains PWM

circuitry and integrated power MOSFETs. Figure 1 shows

the MAX5074’s block diagram. The MAX5074 includes

undervoltage lockout, overtemperature shutdown, and

short-circuit protection for enhanced performance and

reliability. Operation up to 500kHz allows the use of small

external magnetics and capacitors.

Power IC with Integrated MOSFETs for Isolated IEEE

802.3af PD and Telecom Power-Supply Applications

8 _______________________________________________________________________________________

OVT

UVLO

REFOK

REGOK

OVRLD

80µA

33µA

IFLT

OVRLD

CPWM

ILIM

CUVLO

REGOUT

RCFF

FLTINT

RAMP

OPTO

CSS

GND

INBIAS

HVIN

UVLO

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

UVLO

80ns

DELAY

LEADING-

EDGE

DELAY

ONE

SHOT

LEVEL

SHIFT

10MHz

PGND

150mV

0.4Ω

30Ω

0.4Ω

MAX5074

2.7V/1.9V

Figure 1. Block Diagram

1 2 3 4 5 6 7 8 9 10 11 12 13

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