MAX5053 Maxim Integrated Products, MAX5053 Datasheet

MAX5053

Manufacturer Part Number

MAX5053

Description

(MAX5052 / MAX5053) Current-Mode PWM Controllers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5053.pdf (13 pages)

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The MAX5052/MAX5053 current-mode PWM controllers

contain all the control circuitry required for the design of

wide-input-voltage isolated and nonisolated power

supplies. The MAX5052 is well suited for universal input

(rectified 85VAC to 265VAC) or telecom (-36VDC to

-72VDC) power supplies. The MAX5053 is well suited for

low-input-voltage (10.8VDC to 24VDC) power supplies.

The MAX5052/MAX5053 contain an internal error ampli-

fier that regulates the tertiary winding output voltage.

This implements a primary-side regulated, isolated

power supply, eliminating 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.

The input-supply start voltage is externally programma-

ble with a voltage-divider. To shutdown the device, the

UVLO pin is pulled low. Internal digital soft-start

reduces output voltage overshoot. The internal thermal

shutdown circuit protects the device in the event the

junction temperature exceeds +130°C.

The MAX5052 has an internal bootstrap UVLO with

large hysteresis that requires a minimum voltage of

23.6V for startup. The MAX5053 does not have the

internal bootstrap UVLO and can be biased directly

from a minimum voltage of 10.8V.

The 262kHz switching frequency is internally trimmed to

±12% accuracy; this allows the optimization of the

magnetic and filter components resulting in compact,

cost-effective power supplies. The MAX5052A/

MAX5053A are offered with a 50% maximum duty-cycle

limit. The MAX5052B/MAX5053B are offered with a 75%

maximum duty-cycle limit. These devices are available

in 8-pin µMAX packages and operate over the -40°C to

+85°C temperature range.

19-2590; Rev 1; 11/03

Functional Diagram/Typical Operating Circuit/Selector

Guide appear at end of data sheet.

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.

Universal Input AC

Power Supplies

Isolated Telecom Power

Supplies

Networking Systems

Computer Systems/

Servers

Amplifier for Isolated/Nonisolated Power Supplies

Current-Mode PWM Controllers with an Error

________________________________________________________________ Maxim Integrated Products

General Description

Industrial Power

Conversion

Isolated Keep-Alive

Circuits

12V Boost Regulators

12V SEPIC Regulators

Applications

Warning: The MAX5052/MAX5053 are designed to work with

high voltages. Exercise caution.

MAX5052AEUA

MAX5052BEUA

MAX5053AEUA

MAX5053BEUA

Available in a Tiny 8-Pin µMAX Package

Current-Mode Control

50W Output Power

Universal Offline Input Voltage Range

(MAX5053)

Digital Soft-Start

Programmable Input Startup Voltage

Internal Bootstrap UVLO with Large Hysteresis

(MAX5052)

Internal Error Amplifier with 1% Accurate

Reference

Thermal Shutdown

45µA (typ) Startup Supply Current

1.4mA (typ) Operating Supply Current

Fixed Switching Frequency of 262kHz ±12%

50% Maximum Duty-Cycle Limit

(MAX5052A/MAX5053A)

75% Maximum Duty-Cycle Limit

(MAX5052B/MAX5053B)

60ns Cycle-by-Cycle Current-Limit Response Time

Rectified 85VAC to 265VAC (MAX5052)

PART

Directly Driven from 10.8V to 24V Input

TOP VIEW

UVLO/EN

COMP

Ordering Information

-40°C to +85°C

TEMP RANGE

MAX5052

MAX5053

µMAX

Pin Configuration

NDRV

GND

PIN-PACKAGE

8 µMAX

Features

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