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Compact, 36V H-Bridge Transformer Driver for Isolated Supplies

Wide-Range Transformer Driver Simplifies Isolated Power Designs

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Simple, Flexible Design
    • 5V to 36V Supply Range
    • Up to 91% Efficiency
    • Provides over 15W to Transformer
    • Undervoltage Lockout
    • Internal or External Clock Source
    • Synchronous Clock Output (MAX22258)
    • Programmable Overcurrent Threshold
    • 30ns to 200ns Adjustable Deadtime (MAX22258)
  • Robust Integrated System Protection
    • Fault Detection and Indication
    • Overcurrent Limiting up to 1A
    • Overtemperature Protection
    • Precision Internal Clock Source (±6%) Prevents Excessive Transformer Core Losses Due to Frequency Shift
    • Wide Temperature Range: -40°C to +125°C
  • Space Savings
    • Small 3mm x 3mm 10-Pin TDFN Package (MAX22256A/B/C) with 0.5mm Pitch
    • Small 4mm x 5mm 14-Pin TSSOP Package (MAX22258) with 0.65mm Pitch

Applications/Uses

  • Isolated Motor Drive Gate Power Supply
  • Isolated +24V PLC Field Supply

Description

The MAX22256/MAX22258 integrated primary-side controllers and H-bridge drivers for isolated power-supply circuits feature a precision on-board oscillator, protection circuitry, and internal MOSFETs to provide up to 650mARMS of current to the primary winding of a transformer. These devices feature an internal 450kHz (typ) oscillator and can also be driven by an external clock to synchronize multiple devices and control EMI. An internal flip-flop stage guarantees a fixed 50% duty-cycle to prevent DC current flow in the transformer as long as the clock period is constant.

The MAX22256/MAX22258 operate from a wide single-supply voltage range from 5V to 36V and include undervoltage lockout for controlled startup. Break-before-make switching is integrated to prevent cross-conduction of the H-bridge MOSFETs. A resistor-adjustable overcurrent limit allows primary-side limiting of load currents on the transformer’s secondary side and thermal shutdown circuitry provides additional protection against excessive power dissipation.

The MAX22256A features a 30ns (typ) dead time for conventional H-bridge switching topologies. The MAX22256B/C feature a fixed dead time of 60ns (typ) and 100ns (typ), respectively, and are optimized for the zero-voltage switching of an LLC topology. The MAX22258 features a resistor-programmable dead time and a synchronized clock output (CLKO).

Simplified Block Diagram

Technical Docs

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.