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MAX256

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3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

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Product Details

See parametric specs for Transformer Drivers

Key Features

See parametric specs for Transformer Drivers
Parametric specs for Transformer Drivers
VIN (V) (min) 3
VIN (V) (max) 5.5
Driver Output Resistance (Ω) (max) 1
Max. IOUT (A) 1
Topology Full-Bridge
Switching Frequency (kHz) 1000
IQ (mA) (max) 1
Package/Pins SOIC (N)/8
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes) 		4.16
See parametric specs for Transformer Drivers
View Less

Simplified Block Diagram

Technical Docs

Data Sheet 3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies Apr 23, 2015
User Guide Fresno (MAXREFDES11#) ZedBoard Quick Start Guide
User Guide Santa Fe (MAXREFDES5#) ZedBoard Quick Start Guide
User Guide Campbell (MAXREFDES4#) Nexys 3 Quick Start Guide
User Guide Campbell (MAXREFDES4#) ZedBoard Quick Start Guide
App Note Isolated Power Using Capacitors
User Guide Santa Fe (MAXREFDES5#) Nexys 3 Quick Start Guide
Brochure 36V H-Bridge Transformer Driver Provides Isolated Power for Meters
Tutorial Guide to Programmable Logic Controllers | Maxim Integrated

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Transformer Drivers
VIN (V) (min) 3
VIN (V) (max) 5.5
Driver Output Resistance (Ω) (max) 1
Max. IOUT (A) 1
Topology Full-Bridge
Switching Frequency (kHz) 1000
IQ (mA) (max) 1
Package/Pins SOIC (N)/8
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes) 		4.16
See parametric specs for Transformer Drivers

Key Features

  • Simple, Flexible Design Provides Up to 3W to the Transformer in Isolated Power Supplies
    • Single Supply +5V or +3.3V Operation
    • Internal Resistor-Programmable Oscillator Mode
    • External Clock Mode with Watchdog
    • Disable Mode
  • Integrated System Protection
    • Undervoltage Lockout
    • Thermal Shutdown
  • Saves Space on Board
    • 8-Pin Thermally-Enhanced SO Package

Applications/Uses

  • Industrial Process Control
  • Isolated Communications Links
  • Isolated Power Supplies
  • Medical Equipment
  • Telecommunications

Description

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 programmable 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 guarantees a fixed 50% duty cycle to prevent DC current flow in the transformer.

The MAX256 operates from a single-supply voltage of +5V or +3.3V, and includes undervoltage lockout for controlled startup. The device prevents cross-conduction of the H-bridge MOSFETs by implementing break-before-make switching. Thermal shutdown circuitry provides additional protection against damage due to overtemperature conditions.

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.

Simplified Block Diagram

MAX256: Typical Operating Circuit MAX256: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet 3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies Apr 23, 2015
User Guide Fresno (MAXREFDES11#) ZedBoard Quick Start Guide
User Guide Santa Fe (MAXREFDES5#) ZedBoard Quick Start Guide
User Guide Campbell (MAXREFDES4#) Nexys 3 Quick Start Guide
User Guide Campbell (MAXREFDES4#) ZedBoard Quick Start Guide
App Note Isolated Power Using Capacitors
User Guide Santa Fe (MAXREFDES5#) Nexys 3 Quick Start Guide
Brochure 36V H-Bridge Transformer Driver Provides Isolated Power for Meters
Tutorial Guide to Programmable Logic Controllers | Maxim Integrated

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.