Datasheet > MAX256_12

MAX256_12

更新时间： 2024-11-25 07:16:51

品牌	Logo	应用领域
美信 - MAXIM		变压器驱动器
页数	文件大小	规格书
14页	214K
描述
3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

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MAX256_12 数据手册

19-3748; Rev 1; 3/12

3W Primary-Side Transformer H-Bridge Driver

for Isolated Supplies

MAX256

General Description

Features

The MAX256 is an integrated primary-side controller

and H-bridge driver for isolated power-supply circuits.

The device contains an on-board oscillator, protection

circuitry and internal FET drivers to provide up to 3W of

power to the primary winding of a transformer. The

MAX256 can be operated using the internal program-

mable oscillator or can be driven by an external clock

for improved EMI performance. Regardless of the clock

source being used, an internal flip-flop stage guaran-

tees a fixed 50% duty cycle to prevent DC current flow

in the transformer.

o Provides Up to 3W to the Transformer in Isolated

Power Supplies

o Single Supply +5V or +3.3V Operation

o Internal Resistor-Programmable Oscillator Mode

o External Clock Mode with Watchdog

o Disable Mode

o Undervoltage Lockout

o Thermal Shutdown

The MAX256 operates from a single-supply voltage of

+5V or +3.3V, and includes undervoltage lockout for

controlled startup. The device prevents cross-conduc-

tion of the H-bridge MOSFETs by implementing break-

before-make switching. Thermal shutdown circuitry

provides additional protection against damage due to

overtemperature conditions.

Ordering Information

The MAX256 is available in the 8-pin thermally-enhanced

SO package. The device is specified for the automotive

(-40°C to +125°C) temperature range.

PART

TEMP RANGE

-40°C to +125°C

PIN-PACKAGE

MAX256ASA+

MAX256ASA/V+T

8 SO-EP*

*EP = Exposed paddle.

*/V denotes an automotive qualified part.

Applications

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Isolated Power Supplies

Medical Equipment

Telecommunications

Industrial Process

Control

Isolated Communications

Links

Typical Application Circuit

Pin Configuration

+5V

4.7µF

470nF

CK_RS

ST1

+5V ISOLATED

1:2.6CT

ST1

ST2

MAX256

0.1µF

MAX256

GND

ST2

MODE

CK_RS

*EP

MODE

47kΩ

GND

SO-EP

*CONNECT EXPOSED PAD TO GND.

+5V TO ISOLATED +5V TYPICAL APPLICATION

________________________________________________________________ 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...14

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