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MAX13256

36V H-Bridge Transformer

Driver for Isolated Supplies

�� Maxim Integrated Products 1

General 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 sup-

ply. 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 cur-

rent limit of the MAX13256 is set by an external resistor. A

FAULT output asserts when the device detects an overtem-

perature 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 can be operated using the internal oscillator

or driven by an external clock to synchronize multiple

MAX13256 devices and precisely set the switching fre-

quency. 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 -40NC to +125NC

automotive temperature range.

Benefits and Features

S 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

S Integrated System Protection

 Fault Detection and Indication

 Overcurrent Limiting

 Overtemperature Protection

S Saves Space on Board

 Small 10-Pin TDFN Package (3mm x 3mm)

Applications

Power Meters

Isolated Fieldbus Interfaces

24V PLC Supply Isolation

Medical Equipment

Motor Controls

Typical Operating Circuit

19-5847; Rev 1; 8/11

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX13256.related

E V A L U A T I O N K I T A V A I L A B L E

FAULT

1µF

0.1µF

+24V

4.6k

LIM

CLK

ST2

GND

ST1

ITH

ISOLATED

OUT

MAX13256

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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Pagina 1 - Driver for Isolated Supplies

MAX1325636V H-Bridge Transformer Driver for Isolated Supplies �� Maxim Integrated Prod

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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licens

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