Rainbow-electronics MAX15001 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX15000/MAX15001 current-mode PWM con-

trollers contain all the control circuitry required for the

design of wide-input-voltage isolated and nonisolated

power supplies. The MAX15000 is well suited for uni-

versal input (rectified 85VAC to 265VAC) or telecom

(-36VDC to -72VDC) power supplies. The MAX15001

is well suited for low input voltage (9.5VDC to 24VDC)

power supplies.

The MAX15000/MAX15001 contain an internal error

amplifier that regulates the tertiary winding output volt-

age which is used in primary-side-regulated isolated

power supplies. Primary-side regulation eliminates the

need for an optocoupler. An input undervoltage lockout

(UVLO) is provided for programming the input-supply

start voltage and to ensure proper operation during

brownout conditions. An open-drain UVLO flag output,

with 210µs internal delay, allows the sequencing of a

secondary-side controller. The input-supply start volt-

age is externally programmable with a voltage-divider.

A UVLO/EN input is used to shutdown the MAX15000/

MAX15001. Internal digital soft-start eliminates output

voltage overshoot.

The MAX15000 has an internal bootstrap UVLO with

large hysteresis that requires a minimum 23.6V for start-

up. The MAX15001 does not have the internal bootstrap

UVLO and can be biased directly from a minimum volt-

age of 9.5V.

The switching frequency for the MAX15000/MAX15001 is

programmable with an external resistor. The MAX15000A/

MAX15001A provide a 50% maximum duty-cycle limit,

while the MAX15000B/MAX15001B provide a 75% maxi-

mum duty-cycle limit. These devices are available in 10-

pin µMAX

packages and are rated for operation over the

-40°C to +85°C temperature range.

Applications

1/2, 1/4, and 1/8th Brick Power Modules

High-Efficiency, Isolated Telecom Power

Supplies

Networking/Servers

Isolated Keep-Alive Power Supplies

12V Boost and SEPIC Regulators

Isolated and Nonisolated High-Brightness LED

Power Supplies

Industrial Power Conversion

Features

♦ Current-Mode Control

♦ Programmable Switching Frequency Up to 625kHz

♦ Accurate UVLO Threshold (1%)

♦ Open-Drain UVLO Flag Output with Internal Delay

♦ 36V to 72V Telecom Voltage Range

♦ Universal Offline Input Voltage Range

Rectified 85VAC to 265VAC (MAX15000)

♦ 9.5V to 24V Input (MAX15001)

♦ Digital Soft-Start

♦ Internal Bootstrap UVLO with Large Hysteresis

(MAX15000)

♦ Internal Error Amplifier with 1.5% Accurate

Reference

♦ 50µA (typ) Startup Supply Current

♦ 50% Maximum Duty-Cycle Limit

(MAX15000A/MAX15001A)

♦ 75% Maximum Duty-Cycle Limit

(MAX15000B/MAX15001B)

♦ 60ns Cycle-by-Cycle Current-Limit Propagation

Delay

♦ Available in Tiny 10-Pin µMAX Packages

MAX15000/MAX15001

Current-Mode PWM Controllers with

Programmable Switching Frequency

________________________________________________________________ Maxim Integrated Products 1

NDRV

GNDCOMP

UFLG

UVLO/EN

MAX15000

MAX15001

µMAX

TOP VIEW

RTCS

Pin Configuration

Ordering Information

19-3957; Rev 0; 1/06

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.

Warning: The MAX15000/MAX15001 are designed to work with

high voltages. Exercise caution.

+Denotes lead-free package.

Selector Guide appears at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX15000AEUB+

-40°C to +85°C

10 µMAX U10-2

MAX15000BEUB+

-40°C to +85°C

10 µMAX U10-2

MAX15001AEUB+

-40°C to +85°C

10 µMAX U10-2

MAX15001BEUB+

-40°C to +85°C

10 µMAX U10-2

µMAX is a registered trademark of Maxim Integrated Products, Inc.

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MAX15000/MAX15001 1

Resumo do Conteúdo

Página 1 - MAX15000/MAX15001

General DescriptionThe MAX15000/MAX15001 current-mode PWM con-trollers contain all the control circuitry required for thedesign of wide-input-voltage

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MAX15000/MAX15001threshold), then startup has been accomplished andsustained operation will commence. If VINdrops below9.74V before startup is complet

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n-Channel MOSFET Switch DriverThe NDRV output drives an external n-channel MOSFET.The internal regulator output (VCC), set to approximately9V, drives

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MAX15000/MAX15001Current LimitThe current-sense resistor (R4 in Figure 1), connectedbetween the source of the MOSFET and ground, sets thecurrent limit

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Choose a higher value for R1 than the one calculated inthe previous equation if a longer startup time can betolerated to minimize power loss on this r

Página 6

MAX15000/MAX15001Primary-Side-Regulated,Isolated Telecom Power SupplyFigure 6 shows a complete circuit of a dual-outputpower supply with a telecom vol

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Layout RecommendationsTypically, there are two sources of noise emission in aswitching power supply: high di/dt loops and high dv/dtsurfaces. For exam

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency16 _________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency____________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching FrequencyMaxim cannot assume responsibility for use of any circuitry other th

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency2 __________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency____________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency4 __________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency____________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency6 __________________________________________________________________

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MAX15000/MAX15001Current-Mode PWM Controllers withProgrammable Switching Frequency____________________________________________________________________

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MAX15000/MAX15001Detailed DescriptionThe MAX15000/MAX15001 current-mode PWM con-trollers are ideal for isolated and nonisolated power-supply applicati

Página 18

Current-Mode Control LoopThe advantages of current-mode control over voltage-mode control are twofold. First, there is the feed-for-ward characteristi

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Rainbow-electronics MAX15001 Manual do Utilizador Página 1

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX15001. Rainbow Electronics MAX15001 User Manual Manual do Utilizador

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Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX15001. Rainbow Electronics MAX15001 User Manual Manual do Utilizador

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