Transformers Approved for pSemi 2MHz Push-Pull Drivers for Isolated Power Supplies

May 11, 2018 by Paul Shepard

Murata Power Solutions has announced the release of its 782100 series of transformers designed specifically for use with the Peregrine (pSemi) PE22100 push-pull dc-dc converter driver ICs. The combination of driver IC and transformer allows for easy implementation of an isolated dc-dc converter rated up to 1W, typically used for powering the secondary side of an isolated data interface such as RS232, RS485 or CAN bus.

Typical applications are expected to include industrial control, data acquisition, instrumentation, medical systems, isolated gate drivers, and programmable logic controllers (PLC's).

The PE22100 from pSemi is a push pull driver for driving small transformers for isolated power supply applications. The PE22100 drives the primary of a center-tapped transformer, such as the 782100 family from Murata, from a 3.0V or a 5V supply to deliver an isolated power supply.

The PE22100 consists of an on-chip oscillator whose frequency is set by an external capacitor. The oscillator output is divided by two in frequency to create anti-phase clock signals that drive two power switches. The device also contains an internal current limit and thermal cutout. The PE22100 is available in a 2 × 2 × 0.5 mm  QFN package and is specified for operation from -40 °C to +125 °C.

PE22100 Functional Diagram (click on image to enlarge)

Features of Murata's 782100 series of transformers

  • 3V and 5V versions
  • Isolation to 4kVDC
  • Industry-standard pinout
  • Industrial temperature range of -40˚C to +85˚C


  • Pre-approval by pSemi eliminates the need to qualify a magnetics source when using the Peregrine IC
  • Toroidal construction maximizes efficiency and reduces EMI
  • MSL1 rated: Suited to J-STD-020 high temperature reflow
  • Its low profile of 7mm height is useful in space restrictive applications