Datasheet > MAX8540

MAX8540

更新时间： 2024-11-24 22:55:11

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
16页	290K
描述
Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies

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MAX8540 数据手册

19-2830; Rev 0; 4/03

Synchronizable, High-Frequency Current- and

Voltage-Mode PWM Controllers for Isolated Supplies

General Description

Features

ꢀ 200kHz to 1MHz Adjustable Switching Frequency

ꢀ Synchronization to External Clock

The MAX8540/MAX8541 pulse-width-modulated (PWM)

controllers for forward/flyback isolated DC-to-DC convert-

ers provide maximum flexibility to power-supply design-

ers and reduce external component count. These

controllers allow common PC board layout for current-

mode (MAX8540) and voltage-mode (MAX8541) designs.

ꢀ Programmable, Constant Maximum Volt-Second

Simplifies Transformer Design

ꢀ Programmable Hiccup/Skip Cycles or Latch-Mode

Both controllers feature adjustable switching frequency

and external synchronization from 200kHz to 1MHz.

Active-high and active-low enable, undervoltage pro-

tection (UVP), and overvoltage protection (OVP) reduce

external component count.

Protection

ꢀ Clean Startups with High-Capacitance Loads

ꢀ Programmable Under/Overvoltage Protection

ꢀ Current-Mode, Adjustable Slope Compensation

Maximum duty cycle is adjustable, and the feed-forward

function scales the maximum duty cycle with input volt-

age to limit the maximum volt-seconds applied to the

transformer primary. The MAX8540 allows the user to

select the value of slope compensation to further opti-

mize magnetics design. The MAX8541 features user-

adjustable ramp magnitude for the PWM comparator.

(MAX8540)

ꢀ Voltage-Mode, Adjustable Ramp Magnitude

(MAX8541)

ꢀ 10mA, 5V Regulator

ꢀ 75mV to 1.25mV Adjustable Current Limit

A cycle-by-cycle current-limit function controls the peak

primary current during overload and short circuit. Both

controllers can be set to latch off or to hiccup when a

short circuit is detected. The number of current-limited

cycles to initiate the hiccup mode and number of

cycles skipped are user selectable to allow startup with

high-capacitance loads and protect the converter

against sustained short circuits.

Reduces External Components

ꢀ Internal Gate Driver for Low-Power Applications

ꢀ External Gate Driver for High-Power Applications

Ordering Information

The MAX8540/MAX8541 feature 9Ω internal gate dri-

vers for low-power applications and are compatible

with external gate drivers for high-power applications.

Both devices are available in the space-saving 16-pin

QSOP package.

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

16 QSOP

MAX8540EEE

MAX8541EEE

16 QSOP

The MAX8541 EV kit evaluates the MAX8540 and the

MAX8541 to speed designs. Design examples are also

available in application notes: 50W Voltage-Mode

Forward Converter Design with the MAX8541 and 50W

Current-Mode Forward Converter Design with the

MAX8540.

Pin Configurations

TOP VIEW

REF

16 V

Applications

15 DRV

Isolated DC-to-DC Modules (Bricks)

14 GND

13 SKTON

12 CS

Cellular Base Stations

MAX8540EEE

FREQ/SYNC

Telecom and Network Systems

High-Performance Off-Line AC/DC Converters

MAXDTY

11 SKTOFF

10 ILIM

SCOMP

OPTO

QSOP

Functional Diagrams and Typical Operating Circuit appear

at end of data sheet.

Pin Configurations continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...16

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与MAX8540相关器件

型号	品牌	获取价格	描述	数据表
MAX8540\|MAX8541	MAXIM	获取价格	Synchronizable. High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supp
MAX8540EEE	MAXIM	获取价格	Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supp
MAX8540EEE-T	MAXIM	获取价格	Switching Controller, Voltage-mode, 1000kHz Switching Freq-Max, BICMOS, PDSO16, 0.150 INCH
MAX8540-MAX8541	MAXIM	获取价格	Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supp
MAX8541	MAXIM	获取价格	Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supp
MAX8541EEE	MAXIM	获取价格	Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supp
MAX8543	MAXIM	获取价格	Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP
MAX8543EEE	MAXIM	获取价格	Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP
MAX8543EEE+T	MAXIM	获取价格	Switching Controller, Current-mode, 1200kHz Switching Freq-Max, BICMOS, PDSO16, 0.150 INCH
MAX8543EEE-T	MAXIM	获取价格	Switching Controller, Current-mode, 1200kHz Switching Freq-Max, BICMOS, PDSO16, 0.150 INCH

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