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MAX13256

MAX13256

36V H-Bridge Transformer Driver for Isolated Supplies

Wide-Range Transformer Driver Simplifies Isolated Power Designs

Data Sheet
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Overview

Description

The MAX13256 H-bridge transformer driver provides a simple solution for making isolated power supplies up to 10W. The device drives a transformer's primary coil with up to 300mA of current from a wide 8V to 36V DC supply. The transformer's secondary-to-primary winding ratio defines the output voltage, allowing selection of virtually any isolated output voltage.

The device features adjustable current limiting, allowing indirect limiting of secondary-side load currents. The current limit of the MAX13256 is set by an external resistor. An active-low FAULT output asserts when the device detects an overtemperature or overcurrent condition. In addition, the device features a low-power mode to reduce the overall supply current to 0.65mA (typ) when the driver is not in use.

The device features an internal oscillator for autonomous operation and an external clock source input to synchronize multiple MAX13256 devices and precisely set the switching frequency. Internal circuitry guarantees a fixed 50% duty cycle to prevent DC current flow through the transformer, regardless of which clock source is used.

The device is available in a small 10-pin (3mm x 3mm) TDFN package and is specified over the -40°C to +125°C automotive temperature range.

MAX13256: Typical Operating Circuit MAX13256: Typical Operating Circuit Enlarge+

Key Features

  • Simple, Flexible Design
    • 8V to 36V Supply Range
    • Up to 90% Efficiency
    • Provides Up to 10W to the Transformer
    • Undervoltage Lockout
    • 2.5V to 5V Compatible Logic Interface
    • Internal or External Clock Source
    • Adjustable Overcurrent Threshold
  • Integrated System Protection
    • Fault Detection and Indication
    • Overcurrent Limiting
    • Overtemperature Protection
  • Saves Space on Board
    • Small 10-Pin TDFN Package (3mm x 3mm)

Applications/Uses

  • 24V PLC Supply Isolation
  • Isolated Fieldbus Interfaces
  • Medical Equipment
  • Motor Controls
  • Power Meters

Key Specs

Part Number Application (VIN) VIN
(V)		 VIN
(V)		 Driver Output Resistance
(Ω)		 Max. IOUT
(A)		 Topology Freq.
(kHz)		 ICC
(mA)		 Package/Pins Oper. Temp.
(°C)		 Budgetary
Price
min max max max See Notes
MAX13256  Industrial (24V) 8 36 1.5 0.3 Full-Bridge 425 9
TDFN-EP/10
 -40 to +125 $2.65 @1k
See All Transformer Drivers (6)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX13256EVKIT: Evaluation Kit for the MAX13256

Technical Documents

User Guide 5866 MAXREFDES71# ZedBoard Quick Start Guide
App Note 5766 Choosing the Right Transformer with the MAX13256
User Guide 5614 Corona (MAXREFDES12#) ZedBoard Quick Start Guide
User Guide 5613 Corona (MAXREFDES12#) Nexys 3 Quick Start Guide
Sub-System Board 5611 Corona (MAXREFDES12#): Isolated Industrial Octal Digital Input Translator/Serializer
Sub-System Board 5509 Oceanside (MAXREFDES9#): 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply
Tutorial 5445 Stuxnet and Other Things that Go Bump in the Night
App Note 5355 Using an H-Bridge Transformer Driver to Charge a Supercapacitor
App Note 5072 Snubber Design for the MAX13256

Quality and Environmental Data

Product Reliability Reports: MAX13256.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Transformer Information
Topmark Coding MAX13256

Order

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Technical Docs

Reference Designs