EVL8017-L-00A Transformer

Other Products
1

Dear Monolithic Power Systems Support Team,

I hope you are doing well.

We are currently developing a compact, low-noise PoE-powered measurement device using the MP8017GL controller in Active-Clamp Primary-Side Regulation (PSR) mode. We have referred to the EVL8017-L-00A evaluation board design, which specifies the transformer TWPEP090909B300T. However, we understand that this part is likely an evaluation board-specific transformer and may not be suitable or readily available for production use.

We would greatly appreciate your guidance in selecting a production-ready flyback transformer that meets our design requirements:

Design Parameters:

  • Controller: MP8017GL

  • Operating Mode: Active-Clamp PSR

  • Input Voltage Range: 37V to 57V (Standard PoE)

  • Output Voltage: 12V

  • Maximum Output Power: 12 W

  • Target Switching Frequency: ~650 kHz

  • Key Constraints: Small physical size and low EMI are critical — as this is a precision measurement product with stringent form factor and EMI constraints

We would like to ensure that the recommended transformer:

  • Matches or closely aligns with the inductance, turns ratio, and frequency characteristics used on the EVL8017-L evaluation board

  • Is available for production (or has an available manufacturer part number)

  • Has appropriate isolation ratings for PoE

  • Is suitable for use with the MP8017GL in Active-Clamp PSR configurations

If there are any specific transformer models, manufacturer part numbers, or design guidelines you recommend (including primary/secondary inductance target, turns ratio, and physical guidelines), we would be grateful to receive them.

2

Hello Samudra,

Apologies for the delay on this request.

You can customize the specs of the TWPEP090909B300T as listed in the datasheet for reference:

image
image787×263 36.7 KB

Here is the source of this image, which was found on page 10 of this document: TWPEP090909B300T Sunlord datasheet | PDF

Regarding the ordering of this specific transformer involved here, please check your DMs regarding this inquiry.

3

If you do customize this transformer based on the specs above, I have seen many implementations where the DCR is minimized by using thicker copper gauge wire to minimize on DCR.

I have personally helped design transformers with a key focus on minimizing leakage. Here are the things that I have done to do this:

  • If you want to reduce DCR and minimize leakage, use smaller gauge wires in parallel to minimize on skin effect.
  • Interleaved and multi-layer windings can minimize leakage inductance between windings.
  • Be sure to add sufficient shielding between windings as well.

Since it has been some time since you have last posted, do share any updates you may have had here.

Best,

Krishan