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General Description

The MAX5074 isolated PWM power IC features integrated

switching power MOSFETs connected in a voltage-

clamped, two-transistor, power-circuit configuration. This

device can be used in both forward and flyback configu-

rations with a wide input voltage range from 11V to 76V

and up to 15W of output power.

The voltage-clamped power topology enables full

recovery of stored magnetizing and leakage inductive

energy for enhanced efficiency and reliability. A look-

ahead signal for driving secondary-side synchronous

rectifiers can be used to increase efficiency.

A wide array of protection features includes UVLO,

overtemperature shutdown, and short-circuit protection

with hiccup current limit for enhanced performance and

reliability. Operation up to 500kHz allows smaller exter-

nal magnetics and capacitors.

The MAX5074 is rated for operation over the -40°C to

+125°C temperature range and is available in a 20-pin

TSSOP package.

Warning: The MAX5074 is designed to work with

high voltages. Exercise caution.

Applications

IEEE 802.3af PD Power Supplies

Isolated IP Phone Power Supplies

High-Efficiency Telecom/Datacom Power Supplies

48V Input, Isolated Power-Supply Modules

WLAN Access-Point Power Supplies

ADSL Line Cards

ADSL Line-Driver Power Supplies

Distributed Power Systems with 48V Bus

Features

♦ Clamped, Two-Switch Power IC for High Efficiency

♦ No Reset Winding Required

♦ Up to 15W Output Power

♦ Bias Voltage Regulator with Automatic High-

Voltage Supply Turn-Off

♦ 11V to 76V Wide Input Voltage Range

♦ Integrated High-Voltage 0.4Ω Power MOSFETs

♦ Feed-Forward Voltage-Mode Control For Fast

Input Transient Rejection

♦ Programmable Brownout Undervoltage Lockout

♦ Internal Overtemperature Shutdown

♦ Indefinite Short-Circuit Protection With

Programmable Fault Integration

♦ Integrated Look-Ahead Signal for Secondary-Side

Synchronous Rectification

♦ >90% Efficiency with Synchronous Rectification

♦ Up to 500kHz Switching Frequency

♦ High-Power (1.74W), Small-Footprint 20-Pin

Thermally Enhanced TSSOP Package

MAX5074

Power IC with Integrated MOSFETs for Isolated IEEE

802.3af PD and Telecom Power-Supply Applications

________________________________________________________________ Maxim Integrated Products 1

INBIAS

HVIN

UVLO

BSTRCFF

FLTINT

RTCT

REGOUT

TOP VIEW

DRNH

XFRMRH

DRVIN

XFRMRLPPWM

CSS

OPTO

RAMP

SRC

PGNDCS

GND

MAX5074

TSSOP

Pin Configuration

Ordering Information

MAX5074

DRNH

SRC

DRVL

DRVH

OUT

XFRMRH

XFRMRL

Simplified Application Circuit

19-3312; Rev 0; 7/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*EP = Exposed pad.

EVALUATION KIT AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX5074AUP -40°C to +125°C 20-TSSOP-EP*

1 2 3 4 5 6 ... 12 13

Resumo do Conteúdo

Página 1 - EVALUATION KIT AVAILABLE

General DescriptionThe MAX5074 isolated PWM power IC features integratedswitching power MOSFETs connected in a voltage-clamped, two-transistor, power-

Página 2 - ELECTRICAL CHARACTERISTICS

MAX5074Maximize the signal-to-noise ratio by setting the ramppeak as high as possible. Calculate the low-frequency,small-signal gain of the power stag

Página 3

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications_____________________________________________

Página 4 - HVIN INPUT CURRENT

MAX5074Chip InformationTRANSISTOR COUNT: 7043PROCESS: BiCMOSPower IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Appl

Página 5

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply ApplicationsMaxim cannot assume responsibility for use of

Página 6

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications2 ___________________________________________

Página 7 - Pin Description

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications_____________________________________________

Página 8 - Detailed Description

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications4 ___________________________________________

Página 9

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications_____________________________________________

Página 10 - Applications Information

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications6 ___________________________________________

Página 11

MAX5074Power IC with Integrated MOSFETs for Isolated IEEE802.3af PD and Telecom Power-Supply Applications_____________________________________________

Página 12 - Chip Information

MAX5074Detailed DescriptionThe MAX5074 PWM power IC is the primary-side controller for voltage-mode, isolated forward or flybackpower converters. This

Página 13 - Package Information

Power TopologyThe two-switch forward converter topology offers out-standing robustness against faults and transformersaturation while affording effici

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Rainbow-electronics MAX5074 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX5074. Rainbow Electronics MAX5074 User Manual Manual do Utilizador

Resumo do Conteúdo

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