Maxim Integrated Products has an H-bridge transformer driver with a wide input-voltage range for isolated power supplies.

The MAX13256 can be used to drive a transformer’s primary coil with up to 300mA of current from an 8V to 36V dc supply which can deliver up to 10W of isolated power.

A benefit is that users can choose their own transformer winding ratio which defines the output voltage, thus allowing the selection of virtually any isolated output voltage.

The devices integrate protection features that prevent system-level failures. Adjustable current limiting allows indirect limiting of secondary-side load currents. An overcurrent limit is set by an external resistor over the 215mA to 650mA (typ) range.

An active-low FAULT output asserts when the device detects an overtemperature or overcurrent condition. This integrated thermal and short-circuit protection ensures safe operation and reduces both cost and PCB space over discrete solutions.
The MAX13256 is available in a 10-pin TDFN and is specified over the -40°C to +125°C automotive temperature range. 

For more information, see http://www.maxim-ic.com