MAX22258

RECOMMENDED FOR NEW DESIGNS

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

Wide-Range Transformer Driver Simplifies Isolated Power Designs

Data Sheet (Rev. 0)
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Overview

  • 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

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).

Applications

  • Isolated Motor Drive Gate Power Supply
  • Isolated +24V PLC Field Supply
MAX22258
Compact, 36V H-Bridge Transformer Driver for Isolated Supplies
MAX22256, MAX22258: Typical Operating Circuit
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Documentation

Data Sheet 1

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Evaluation Kits

eval board
schematic 1
MAX22256EVKIT

Evaluation Kit for the MAX22256

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Features and Benefits

  • 5V to 36V Input Supply Range
  • Up to 90% Efficiency
  • Full-Wave Rectified Output
  • Configurable for a Voltage Doubler, Full-Wave, and Half-Wave Rectifier
  • Internal or External Clock Operation Option
  • Designed for 1500VRMS Isolation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX22256 evaluation kit (EV kit) is a fully assembled and tested PCB that contains the MAX22256, a 15W isolated H-bridge DC-DC converter. The EV kit operates from a 5V to 36V DC power source and the onboard 1:1 turns-ratio transformer from Wurth sets the output voltage, operating up to a 1A current limit.

The EV kit provides greater than 90% overall efficiency at +24V between 2.2W and up to 8.3W output power using an H-bridge DC-DC converter topology. The MAX22256 EV kit operates in pulse width modulation (PWM) mode, by default. The transformer provides galvanic isolation with the output powered from a full-wave rectifier circuit, reducing the output-voltage ripple.

The EV kit circuit is configured as a full-wave rectifier with an output voltage that follows the input voltage, but is configurable for other topologies.

The EV kit comes with the MAX22256B installed but can be used to evaluate any version of the MAX22256 (MAX22256A, MAX22256B, and MAX22256C).

Applications

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

eval board
schematic 2
MAX22258EVKIT

Evaluation Kit for the MAX22258

Buy Now View Details

Features and Benefits

  • 5V to 36V Input Supply Range
  • Up to 90% Efficiency
  • Full-Wave Rectified Output
  • Configurable for a Voltage Doubler, Full-Wave, and Half-Wave Rectifier
  • Internal or External Clock Operation Option
  • Designed for 1500VRMS Isolation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX22258 evaluation kit (EV kit) is a fully assembled and tested PCB that contains the MAX22258, a 15W isolated H-bridge DC-DC converter. The EV kit operates from an 5V to 36V DC power source and the on-board 1:1 turns-ratio transformer from Wurth sets the output voltage, operating up to a 1A current limit.

The EV kit provides greater than 90% overall efficiency at +24V between 2.2W and up to 8.3W output power using an H-bridge DC-DC converter topology. The MAX22258 EV kit operates in LLC mode by default. Input-ripple current and radiated noise are minimized by the inherent balanced nature of the design with no interruption in the input current. The transformer provides galvanic isolation with the output powered from a full-wave rectifier circuit, reducing the output-voltage ripple.

The EV kit circuit is configured as a full-wave rectifier, with an output voltage that follows the input voltage but is configurable for other topologies.

Applications

  • Isolated Motor Drive Gate Power Supply
  • Isolated +24V PLC Field Supply
MAX22256EVKIT
Evaluation Kit for the MAX22256
MAX22256EVKIT: Typical Operating Circuit
MAX22258EVKIT
Evaluation Kit for the MAX22258
MAX22258EVKIT: Board Photo

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