Low-profile transformers add density to convertors

Edited by the Electronicstalk editorial team Jun 3, 2003

A new range of surface-mount planar transformers is ideal for high-density isolated DC/DC modules and discrete power supplies.

Pulse has a new range of surface-mount planar transformers for high-density isolated DC/DC modules and discrete power supplies.

These transformers feature excellent AC resistance performance, low leakage inductance and stand at only 6.6mm tall, while offering 500W/in3, the highest power density available in today's market.

The new series is designed to meet operational insulation, 1500V DC isolation and is optimised for frequencies between 200 and 500kHz.

The devices are ideally suited to telecomms, datacomms and industrial control applications.

The first two transformers in the series are designed for a forward convertor DC/DC topology operating from a wide-range telecomms input voltage of 36 to 72V.

The PA0457 provides a regulated output of 67W (3.3V/20A), whereas the PA0458 yields 75W (5.0V/15A).

Other turns ratios can be made available for differing output voltages.

Both transformers' surface-mount (SMT) packages are compatible with all contemporary pick-and-place processes.

The turns ratios are 12:2 and 12:3 for the PA0457 and PA0458, respectively.

Primary inductance is rated at a minimum 220uH.

The primary direct current rating (DCR) is rated at 108mohm, the primary auxiliary at 200mohm and the secondary at 1.3 or 3.0mohm, dependent on model number.

An extended operating temperature range of -40 to +125C ensures product stability with minimum drift in a wide range of environmental conditions.

The new series is available in trays and tape-and-reel packaging.

Lead-time is four to six weeks.